<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with WebFilings-->
<!-- -->
<linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <roleRef roleURI="http://www.onsemi.com/role/BackgroundAndBasisOfPresentation" xlink:href="onnn-20130628.xsd#BackgroundAndBasisOfPresentation" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/BackgroundAndBasisOfPresentationNarrativeDetails" xlink:href="onnn-20130628.xsd#BackgroundAndBasisOfPresentationNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/BalanceSheetInformation" xlink:href="onnn-20130628.xsd#BalanceSheetInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/BalanceSheetInformationNarrativeDetails" xlink:href="onnn-20130628.xsd#BalanceSheetInformationNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/BalanceSheetInformationPeriodicPensionExpenseDetails" xlink:href="onnn-20130628.xsd#BalanceSheetInformationPeriodicPensionExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/BalanceSheetInformationScheduleOfBalanceSheetInformationDetails" xlink:href="onnn-20130628.xsd#BalanceSheetInformationScheduleOfBalanceSheetInformationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/BalanceSheetInformationTables" xlink:href="onnn-20130628.xsd#BalanceSheetInformationTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/BalanceSheetInformationWarrantyReservesDetails" xlink:href="onnn-20130628.xsd#BalanceSheetInformationWarrantyReservesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLoss" xlink:href="onnn-20130628.xsd#ChangesInAccumulatedOtherComprehensiveLoss" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLossComponentsOfOtherComprehensiveIncomeDetails" xlink:href="onnn-20130628.xsd#ChangesInAccumulatedOtherComprehensiveLossComponentsOfOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLossReclassificationsDetails" xlink:href="onnn-20130628.xsd#ChangesInAccumulatedOtherComprehensiveLossReclassificationsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLossTables" xlink:href="onnn-20130628.xsd#ChangesInAccumulatedOtherComprehensiveLossTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/CommitmentsAndContingencies" xlink:href="onnn-20130628.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:href="onnn-20130628.xsd#CommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/CommitmentsAndContingenciesOperatingLeasesFutureMinimumPaymentsReceivableDetails" xlink:href="onnn-20130628.xsd#CommitmentsAndContingenciesOperatingLeasesFutureMinimumPaymentsReceivableDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/CommitmentsAndContingenciesTables" xlink:href="onnn-20130628.xsd#CommitmentsAndContingenciesTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ConsolidatedBalanceSheet" xlink:href="onnn-20130628.xsd#ConsolidatedBalanceSheet" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ConsolidatedBalanceSheetParenthetical" xlink:href="onnn-20130628.xsd#ConsolidatedBalanceSheetParenthetical" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ConsolidatedStatementOfCashFlows" xlink:href="onnn-20130628.xsd#ConsolidatedStatementOfCashFlows" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:href="onnn-20130628.xsd#ConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/DocumentAndEntityInformation" xlink:href="onnn-20130628.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/EarningsPerShareAndEquity" xlink:href="onnn-20130628.xsd#EarningsPerShareAndEquity" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/EarningsPerShareAndEquityIncomePerShareCalculationsDetails" xlink:href="onnn-20130628.xsd#EarningsPerShareAndEquityIncomePerShareCalculationsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/EarningsPerShareAndEquityNarrativeDetails" xlink:href="onnn-20130628.xsd#EarningsPerShareAndEquityNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/EarningsPerShareAndEquityTables" xlink:href="onnn-20130628.xsd#EarningsPerShareAndEquityTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FairValueOfFinancialInstruments" xlink:href="onnn-20130628.xsd#FairValueOfFinancialInstruments" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsCarryingAmountsAndFairValuesOfLongTermBorrowingsDetails" xlink:href="onnn-20130628.xsd#FairValueOfFinancialInstrumentsCarryingAmountsAndFairValuesOfLongTermBorrowingsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsFairValueOfAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" xlink:href="onnn-20130628.xsd#FairValueOfFinancialInstrumentsFairValueOfAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsFairValueOfShortTermInvestmentsDetails" xlink:href="onnn-20130628.xsd#FairValueOfFinancialInstrumentsFairValueOfShortTermInvestmentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsNarrativeDetails" xlink:href="onnn-20130628.xsd#FairValueOfFinancialInstrumentsNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsTables" xlink:href="onnn-20130628.xsd#FairValueOfFinancialInstrumentsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FinancialInstruments" xlink:href="onnn-20130628.xsd#FinancialInstruments" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FinancialInstrumentsNarrativeDetails" xlink:href="onnn-20130628.xsd#FinancialInstrumentsNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FinancialInstrumentsScheduleOfNetForeignExchangePositionsDetails" xlink:href="onnn-20130628.xsd#FinancialInstrumentsScheduleOfNetForeignExchangePositionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/FinancialInstrumentsTables" xlink:href="onnn-20130628.xsd#FinancialInstrumentsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GoodwillAndIntangibleAssets" xlink:href="onnn-20130628.xsd#GoodwillAndIntangibleAssets" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsNarrativeDetails" xlink:href="onnn-20130628.xsd#GoodwillAndIntangibleAssetsNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsSummaryOfAmortizationExpenseDetails" xlink:href="onnn-20130628.xsd#GoodwillAndIntangibleAssetsSummaryOfAmortizationExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsSummaryOfGoodwillByOperatingSegmentDetails" xlink:href="onnn-20130628.xsd#GoodwillAndIntangibleAssetsSummaryOfGoodwillByOperatingSegmentDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsNetDetails" xlink:href="onnn-20130628.xsd#GoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsNetDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsTables" xlink:href="onnn-20130628.xsd#GoodwillAndIntangibleAssetsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatements" xlink:href="onnn-20130628.xsd#GuarantorAndNonGuarantorStatements" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsCorrectionsToGuarantorAndNonGuarantorStatementsDetails" xlink:href="onnn-20130628.xsd#GuarantorAndNonGuarantorStatementsCorrectionsToGuarantorAndNonGuarantorStatementsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfBalanceSheetDetails" xlink:href="onnn-20130628.xsd#GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfBalanceSheetDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfCashFlowsDetails" xlink:href="onnn-20130628.xsd#GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfCashFlowsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfOperationsAndComprehensiveIncomeDetails" xlink:href="onnn-20130628.xsd#GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfOperationsAndComprehensiveIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsTables" xlink:href="onnn-20130628.xsd#GuarantorAndNonGuarantorStatementsTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebt" xlink:href="onnn-20130628.xsd#LongTermDebt" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebtAcquisitionOfNotePayableToSmbcDetails" xlink:href="onnn-20130628.xsd#LongTermDebtAcquisitionOfNotePayableToSmbcDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebtAnnualMaturitiesRelatingToLongTermDebtDetails" xlink:href="onnn-20130628.xsd#LongTermDebtAnnualMaturitiesRelatingToLongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebtConversionAndRetirementOfDebtdetails" xlink:href="onnn-20130628.xsd#LongTermDebtConversionAndRetirementOfDebtdetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebtLongTermDebtDetails" xlink:href="onnn-20130628.xsd#LongTermDebtLongTermDebtDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebtLossOnDebtExchangeDetails" xlink:href="onnn-20130628.xsd#LongTermDebtLossOnDebtExchangeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebtNarrativeDetails" xlink:href="onnn-20130628.xsd#LongTermDebtNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/LongTermDebtTables" xlink:href="onnn-20130628.xsd#LongTermDebtTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/RecentAccountingPronouncementsRecentAccountingPronouncements" xlink:href="onnn-20130628.xsd#RecentAccountingPronouncementsRecentAccountingPronouncements" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/RecentAccountingPronouncementsRecentAccountingPronouncementsPolicies" xlink:href="onnn-20130628.xsd#RecentAccountingPronouncementsRecentAccountingPronouncementsPolicies" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNet" xlink:href="onnn-20130628.xsd#RestructuringAssetImpairmentsAndOtherNet" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetNarrativeDetails" xlink:href="onnn-20130628.xsd#RestructuringAssetImpairmentsAndOtherNetNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetReconciliationOfRestructuringAssetImpairmentsAndOtherNetCaptionOnConsolidatedStatementOfOperationsDetails" xlink:href="onnn-20130628.xsd#RestructuringAssetImpairmentsAndOtherNetReconciliationOfRestructuringAssetImpairmentsAndOtherNetCaptionOnConsolidatedStatementOfOperationsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetRollforwardOfAccruedRestructuringChargesDetails" xlink:href="onnn-20130628.xsd#RestructuringAssetImpairmentsAndOtherNetRollforwardOfAccruedRestructuringChargesDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetTables" xlink:href="onnn-20130628.xsd#RestructuringAssetImpairmentsAndOtherNetTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SegmentInformation" xlink:href="onnn-20130628.xsd#SegmentInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SegmentInformationNarrativeDetails" xlink:href="onnn-20130628.xsd#SegmentInformationNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SegmentInformationReconciliationsOfSegmentGrossProfitAndSegmentOperatingIncomeDetails" xlink:href="onnn-20130628.xsd#SegmentInformationReconciliationsOfSegmentGrossProfitAndSegmentOperatingIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SegmentInformationRevenuesByGeographicLocationIncludingLocalSalesAndExportsDetails" xlink:href="onnn-20130628.xsd#SegmentInformationRevenuesByGeographicLocationIncludingLocalSalesAndExportsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SegmentInformationSegmentInformationOfRevenuesGrossProfitAndOperatingIncomeDetails" xlink:href="onnn-20130628.xsd#SegmentInformationSegmentInformationOfRevenuesGrossProfitAndOperatingIncomeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SegmentInformationSummaryOfPropertyPlantAndEquipmentByGeographicLocationDetails" xlink:href="onnn-20130628.xsd#SegmentInformationSummaryOfPropertyPlantAndEquipmentByGeographicLocationDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SegmentInformationTables" xlink:href="onnn-20130628.xsd#SegmentInformationTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensation" xlink:href="onnn-20130628.xsd#ShareBasedCompensation" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationAdditionalInformationOnStockOptionsOutstandingDetails" xlink:href="onnn-20130628.xsd#ShareBasedCompensationAdditionalInformationOnStockOptionsOutstandingDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationNarrativeDetails" xlink:href="onnn-20130628.xsd#ShareBasedCompensationNarrativeDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationSummaryOfRestrictedStockUnitsTransactionsDetails" xlink:href="onnn-20130628.xsd#ShareBasedCompensationSummaryOfRestrictedStockUnitsTransactionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationSummaryOfShareBasedCompensationExpenseDetails" xlink:href="onnn-20130628.xsd#ShareBasedCompensationSummaryOfShareBasedCompensationExpenseDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationSummaryOfStockOptionPlansDetails" xlink:href="onnn-20130628.xsd#ShareBasedCompensationSummaryOfStockOptionPlansDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationTables" xlink:href="onnn-20130628.xsd#ShareBasedCompensationTables" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationWeightedAverageAssumptionsOfEmployeeStockOptionsDetails" xlink:href="onnn-20130628.xsd#ShareBasedCompensationWeightedAverageAssumptionsOfEmployeeStockOptionsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/ShareBasedCompensationWeightedAverageAssumptionsWithEmployeeStockPurchasePlanDetails" xlink:href="onnn-20130628.xsd#ShareBasedCompensationWeightedAverageAssumptionsWithEmployeeStockPurchasePlanDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SupplementalDisclosureOfCashFlowInformation" xlink:href="onnn-20130628.xsd#SupplementalDisclosureOfCashFlowInformation" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SupplementalDisclosureOfCashFlowInformationNonCashFinancingActivitiesAndCashPaymentsDetails" xlink:href="onnn-20130628.xsd#SupplementalDisclosureOfCashFlowInformationNonCashFinancingActivitiesAndCashPaymentsDetails" xlink:type="simple" />
  <roleRef roleURI="http://www.onsemi.com/role/SupplementalDisclosureOfCashFlowInformationTables" xlink:href="onnn-20130628.xsd#SupplementalDisclosureOfCashFlowInformationTables" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <definitionLink xlink:role="http://www.onsemi.com/role/BackgroundAndBasisOfPresentation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/BackgroundAndBasisOfPresentationNarrativeDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/BalanceSheetInformation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/BalanceSheetInformationNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9803AB16C5C3CECF3CAE08BE18ADCAD6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9803AB16C5C3CECF3CAE08BE18ADCAD6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis" xlink:label="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_986AAF3E6099F6C63C0D08BE18AD3ED7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_9803AB16C5C3CECF3CAE08BE18ADCAD6" xlink:to="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_986AAF3E6099F6C63C0D08BE18AD3ED7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_627652259B4764AA30DA08BE18AD7B7A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_986AAF3E6099F6C63C0D08BE18AD3ED7" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_627652259B4764AA30DA08BE18AD7B7A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlansDomain" xlink:label="loc_us-gaap_DefinedBenefitPlansDomain_627652259B4764AA30DA08BE18AD7B7A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis_986AAF3E6099F6C63C0D08BE18AD3ED7" xlink:to="loc_us-gaap_DefinedBenefitPlansDomain_627652259B4764AA30DA08BE18AD7B7A" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember" xlink:label="loc_onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember_225E4E29C613986C98E108BE18AD8DFB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansDomain_627652259B4764AA30DA08BE18AD7B7A" xlink:to="loc_onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember_225E4E29C613986C98E108BE18AD8DFB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_BF7CFB591B0316751AAD08BE18ADDDEA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_BF7CFB591B0316751AAD08BE18ADDDEA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities" xlink:label="loc_us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities_9B44709CB8F5B537FB3408BE18ADD774" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:to="loc_us-gaap_DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities_9B44709CB8F5B537FB3408BE18ADD774" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_D7419C39DE85A4919F6708BE18AD56F1" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_D7419C39DE85A4919F6708BE18AD56F1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_C68756A4CCBF610AA80008BE18ADE217" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_C68756A4CCBF610AA80008BE18ADE217" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_72A6FF10DC3B9628016708BE18AD4515" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments_72A6FF10DC3B9628016708BE18AD4515" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear" xlink:label="loc_us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear_46FF51BF549E5291F96608BE18AEA396" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0C1B5FB1EBC7FFEBC1C908BE18ADA60C" xlink:to="loc_us-gaap_DefinedBenefitPlanEstimatedFutureEmployerContributionsInCurrentFiscalYear_46FF51BF549E5291F96608BE18AEA396" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/BalanceSheetInformationPeriodicPensionExpenseDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/BalanceSheetInformationScheduleOfBalanceSheetInformationDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/BalanceSheetInformationTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/BalanceSheetInformationWarrantyReservesDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLoss" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLossComponentsOfOtherComprehensiveIncomeDetails" xlink:type="extended">
    <loc xlink:href="onnn-20130628.xsd#onnn_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_onnn_AccumulatedOtherComprehensiveIncomeLossLineItems_BA21410058D2C10AEC200DF7D5976B5B" xlink:type="locator" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_onnn_AccumulatedOtherComprehensiveIncomeLossTable_E6060BFA03F3E59B9DC80DF7D596EBE6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossLineItems_BA21410058D2C10AEC200DF7D5976B5B" xlink:to="loc_onnn_AccumulatedOtherComprehensiveIncomeLossTable_E6060BFA03F3E59B9DC80DF7D596EBE6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeAxis" xlink:label="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeAxis_7198617CB834258C89B30E39F856FDC2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossTable_E6060BFA03F3E59B9DC80DF7D596EBE6" xlink:to="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeAxis_7198617CB834258C89B30E39F856FDC2" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeDomain_3D0A0500DE7B2B4FB5950E39F89B8EBC_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeAxis_7198617CB834258C89B30E39F856FDC2" xlink:to="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeDomain_3D0A0500DE7B2B4FB5950E39F89B8EBC_default" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeDomain_3D0A0500DE7B2B4FB5950E39F89B8EBC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeAxis_7198617CB834258C89B30E39F856FDC2" xlink:to="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeDomain_3D0A0500DE7B2B4FB5950E39F89B8EBC" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeMember_EF3F70AE415BCEA69FA80E3AA1830086" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeDomain_3D0A0500DE7B2B4FB5950E39F89B8EBC" xlink:to="loc_onnn_ReclassificationoutofAccumulatedOtherComprehensiveIncomeMember_EF3F70AE415BCEA69FA80E3AA1830086" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_BD6071D1578FAC95745B0DF7D596BFBC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossTable_E6060BFA03F3E59B9DC80DF7D596EBE6" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_BD6071D1578FAC95745B0DF7D596BFBC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_BD6071D1578FAC95745B0DF7D596BFBC" xlink:to="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_BD6071D1578FAC95745B0DF7D596BFBC" xlink:to="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_FAAEAACEE4530C4520EB0DF7D5963B43" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_FAAEAACEE4530C4520EB0DF7D5963B43" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_217ECD2F5523461B1DFF0DF7D5968CB7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_217ECD2F5523461B1DFF0DF7D5968CB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_F748A4B81546ECDBAED70DF7D5974D4B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember_F748A4B81546ECDBAED70DF7D5974D4B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_9F74663C35A7D32FDA130DF7D5971D82" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_3C955B01392C575379D30DF7D596DF3C" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_9F74663C35A7D32FDA130DF7D5971D82" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_2EEBB5DBD9C488CDB38E0E0638E9F8BC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossLineItems_BA21410058D2C10AEC200DF7D5976B5B" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_2EEBB5DBD9C488CDB38E0E0638E9F8BC" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AccumulatedOtherComprehensiveIncomeRollForward" xlink:label="loc_onnn_AccumulatedOtherComprehensiveIncomeRollForward_F26390326A63B65B0B290DF7D59767D7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossLineItems_BA21410058D2C10AEC200DF7D5976B5B" xlink:to="loc_onnn_AccumulatedOtherComprehensiveIncomeRollForward_F26390326A63B65B0B290DF7D59767D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_5C457BE8BA34F2F247FD0DF7D597127B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeRollForward_F26390326A63B65B0B290DF7D59767D7" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_5C457BE8BA34F2F247FD0DF7D597127B" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax" xlink:label="loc_onnn_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_E42A7FA643318BB8A80B0DF7D5976C78" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeRollForward_F26390326A63B65B0B290DF7D59767D7" xlink:to="loc_onnn_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_E42A7FA643318BB8A80B0DF7D5976C78" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_FADD785CEC9F165CE1490DF7D5974C22" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeRollForward_F26390326A63B65B0B290DF7D59767D7" xlink:to="loc_onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_FADD785CEC9F165CE1490DF7D5974C22" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_4E97935E36CD3252F3D50DF7D597B460" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeRollForward_F26390326A63B65B0B290DF7D59767D7" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_4E97935E36CD3252F3D50DF7D597B460" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLossReclassificationsDetails" xlink:type="extended">
    <loc xlink:href="onnn-20130628.xsd#onnn_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_onnn_AccumulatedOtherComprehensiveIncomeLossLineItems_011FB29FE4091FCB6AA36357276F6742" xlink:type="locator" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_onnn_AccumulatedOtherComprehensiveIncomeLossTable_0030361F36DA64A7A4346357276E0583" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossLineItems_011FB29FE4091FCB6AA36357276F6742" xlink:to="loc_onnn_AccumulatedOtherComprehensiveIncomeLossTable_0030361F36DA64A7A4346357276E0583" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_FF7D70D83AB34A0F79676357276EFB79" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossTable_0030361F36DA64A7A4346357276E0583" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_FF7D70D83AB34A0F79676357276EFB79" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_09D7EAACF0F1D73CAD616357276F25E1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_FF7D70D83AB34A0F79676357276EFB79" xlink:to="loc_us-gaap_EquityComponentDomain_09D7EAACF0F1D73CAD616357276F25E1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_09D7EAACF0F1D73CAD616357276F25E1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_FF7D70D83AB34A0F79676357276EFB79" xlink:to="loc_us-gaap_EquityComponentDomain_09D7EAACF0F1D73CAD616357276F25E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_5BC2DE2886258160E33F6357276F406E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_09D7EAACF0F1D73CAD616357276F25E1" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_5BC2DE2886258160E33F6357276F406E" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8AE36FA0B4FC6EDF97636357276F1B27" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_AccumulatedOtherComprehensiveIncomeLossLineItems_011FB29FE4091FCB6AA36357276F6742" xlink:to="loc_onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_8AE36FA0B4FC6EDF97636357276F1B27" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/ChangesInAccumulatedOtherComprehensiveLossTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_CE9E3412A3B5364DFE79635728813C7F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_5D94A5DC794756851D9C635728812FB1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_CE9E3412A3B5364DFE79635728813C7F" xlink:to="loc_us-gaap_LossContingenciesTable_5D94A5DC794756851D9C635728812FB1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_7319CF6C8D3484864E8B6357288166A9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_5D94A5DC794756851D9C635728812FB1" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_7319CF6C8D3484864E8B6357288166A9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1159B7BCCDC1188B56696357288130BF_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7319CF6C8D3484864E8B6357288166A9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1159B7BCCDC1188B56696357288130BF_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1159B7BCCDC1188B56696357288130BF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_7319CF6C8D3484864E8B6357288166A9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1159B7BCCDC1188B56696357288130BF" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoanWithJapaneseCompanyDueTwoThousandTwelveThroughTwoThousandEighteenInterestPayableQuarterlyAtTwoPointThreeThreePercentageMember" xlink:label="loc_onnn_LoanWithJapaneseCompanyDueTwoThousandTwelveThroughTwoThousandEighteenInterestPayableQuarterlyAtTwoPointThreeThreePercentageMember_E784CF33894D8489FA87635728817226" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_1159B7BCCDC1188B56696357288130BF" xlink:to="loc_onnn_LoanWithJapaneseCompanyDueTwoThousandTwelveThroughTwoThousandEighteenInterestPayableQuarterlyAtTwoPointThreeThreePercentageMember_E784CF33894D8489FA87635728817226" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_2980D8C54B0D7BEA481D63572881F3B5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_CE9E3412A3B5364DFE79635728813C7F" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_2980D8C54B0D7BEA481D63572881F3B5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityAmountOutstanding" xlink:label="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_BFDAB9ED592546E3538A635728816FFB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_CE9E3412A3B5364DFE79635728813C7F" xlink:to="loc_us-gaap_LineOfCreditFacilityAmountOutstanding_BFDAB9ED592546E3538A635728816FFB" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OutstandingGuaranteesAndLettersOfCredit" xlink:label="loc_onnn_OutstandingGuaranteesAndLettersOfCredit_5ABE7DD797746E67F0BD63572881FED6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_CE9E3412A3B5364DFE79635728813C7F" xlink:to="loc_onnn_OutstandingGuaranteesAndLettersOfCredit_5ABE7DD797746E67F0BD63572881FED6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CapitalLeaseObligations" xlink:label="loc_us-gaap_CapitalLeaseObligations_27E59758E616D3297CCC63572881EFC6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_CE9E3412A3B5364DFE79635728813C7F" xlink:to="loc_us-gaap_CapitalLeaseObligations_27E59758E616D3297CCC63572881EFC6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_0DAD24E1BDC6DB5E894063572881AC70" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_CE9E3412A3B5364DFE79635728813C7F" xlink:to="loc_us-gaap_LongTermDebt_0DAD24E1BDC6DB5E894063572881AC70" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/CommitmentsAndContingenciesOperatingLeasesFutureMinimumPaymentsReceivableDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/CommitmentsAndContingenciesTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ConsolidatedBalanceSheet" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ConsolidatedBalanceSheetParenthetical" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ConsolidatedStatementOfCashFlows" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/EarningsPerShareAndEquity" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/EarningsPerShareAndEquityIncomePerShareCalculationsDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/EarningsPerShareAndEquityNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ClassOfStockLineItems" xlink:label="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfStockByClassTable" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_E557C5A98FD33C6E960E23BA32634194" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_E557C5A98FD33C6E960E23BA32634194" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_B5EC7098A09CD4F4282023BA326391F9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_E557C5A98FD33C6E960E23BA32634194" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_B5EC7098A09CD4F4282023BA326391F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7056161349B3DD0E3E3823BA3263BA41_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B5EC7098A09CD4F4282023BA326391F9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7056161349B3DD0E3E3823BA3263BA41_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_7056161349B3DD0E3E3823BA3263BA41" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_B5EC7098A09CD4F4282023BA326391F9" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_7056161349B3DD0E3E3823BA3263BA41" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember" xlink:label="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_4EBE0AC996A8FB873CAF23BA32633749" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_7056161349B3DD0E3E3823BA3263BA41" xlink:to="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_4EBE0AC996A8FB873CAF23BA32633749" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_BBA9BCE120FF9BFEDD6323BA3263ED5C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_BBA9BCE120FF9BFEDD6323BA3263ED5C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1FEDE0DA34555C90B68723BA32638BE6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_1FEDE0DA34555C90B68723BA32638BE6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_32D863C13426C4C3085C23BA32723426" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_32D863C13426C4C3085C23BA32723426" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_F8175B49E1AFFF9EB5A623BA327221C2" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_F8175B49E1AFFF9EB5A623BA327221C2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_00340CD3A337482F0C2423BA327281B8" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_00340CD3A337482F0C2423BA327281B8" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_StockRepurchaseProgramAggregateRepurchaseAmountUnpaid" xlink:label="loc_onnn_StockRepurchaseProgramAggregateRepurchaseAmountUnpaid_16CFE9013C2AAA9C2D3B23EBF48B68DE" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_onnn_StockRepurchaseProgramAggregateRepurchaseAmountUnpaid_16CFE9013C2AAA9C2D3B23EBF48B68DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount_AD372F4A2800F9EA17D723BA32720603" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount_AD372F4A2800F9EA17D723BA32720603" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EB6BDF08717415963D6E23BA32720882" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_EB6BDF08717415963D6E23BA32720882" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_CommonStockWithheldUnderlyingRestrictedStockUnits" xlink:label="loc_onnn_CommonStockWithheldUnderlyingRestrictedStockUnits_4562A807F75324E003EB23BA32725141" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_onnn_CommonStockWithheldUnderlyingRestrictedStockUnits_4562A807F75324E003EB23BA32725141" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TreasuryStockSharesReissuedOrRetiredDuringPeriod" xlink:label="loc_onnn_TreasuryStockSharesReissuedOrRetiredDuringPeriod_B0BDFDEB6EE50E5165D723BA3272E9C1" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_onnn_TreasuryStockSharesReissuedOrRetiredDuringPeriod_B0BDFDEB6EE50E5165D723BA3272E9C1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_846B81EDE5EFA436276323BA32720DAF" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_MinorityInterest_846B81EDE5EFA436276323BA32720DAF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_9D282EA3AA2B2024253123BA3272CF79" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_6FA5AADBF91483BD627E23BA326369B3" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_9D282EA3AA2B2024253123BA3272CF79" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/EarningsPerShareAndEquityTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/FairValueOfFinancialInstruments" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsCarryingAmountsAndFairValuesOfLongTermBorrowingsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D870D652CFE3B9B0F6306357285B1FC2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_95BC13B6F174B791CAA26357285A0E95" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D870D652CFE3B9B0F6306357285B1FC2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_95BC13B6F174B791CAA26357285A0E95" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_63082508B9CDE7058C436357285AB392" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_95BC13B6F174B791CAA26357285A0E95" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_63082508B9CDE7058C436357285AB392" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_BA43E4DF9DAF1491E76D6357285A5BC1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_63082508B9CDE7058C436357285AB392" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_BA43E4DF9DAF1491E76D6357285A5BC1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_BA43E4DF9DAF1491E76D6357285A5BC1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_63082508B9CDE7058C436357285AB392" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_BA43E4DF9DAF1491E76D6357285A5BC1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConvertibleNotesPayableMember" xlink:label="loc_us-gaap_ConvertibleNotesPayableMember_3FA93E46355FED412DC96357285B1A6E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_BA43E4DF9DAF1491E76D6357285A5BC1" xlink:to="loc_us-gaap_ConvertibleNotesPayableMember_3FA93E46355FED412DC96357285B1A6E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMember" xlink:label="loc_us-gaap_LongTermDebtMember_F61C3EA751472D9CD8586357285BFBC9" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_BA43E4DF9DAF1491E76D6357285A5BC1" xlink:to="loc_us-gaap_LongTermDebtMember_F61C3EA751472D9CD8586357285BFBC9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_6ED7B4F87F574F9678216357285BA3B3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D870D652CFE3B9B0F6306357285B1FC2" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_6ED7B4F87F574F9678216357285BA3B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaap_DebtInstrumentFairValue_CA1E6CD4F15C58F40FF66357285B8A8F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D870D652CFE3B9B0F6306357285B1FC2" xlink:to="loc_us-gaap_DebtInstrumentFairValue_CA1E6CD4F15C58F40FF66357285B8A8F" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsFairValueOfAssetsAndLiabilitiesMeasuredOnRecurringBasisDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_5F9EF3773BD0D4CE03CD23BA31E6193E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_D7421DCFC9E0766FECD723BA31D6A4A6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_5F9EF3773BD0D4CE03CD23BA31E6193E" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_D7421DCFC9E0766FECD723BA31D6A4A6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AC2E56BF173CFF11005423BA31D69192" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_D7421DCFC9E0766FECD723BA31D6A4A6" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AC2E56BF173CFF11005423BA31D69192" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D7FEFA3AE2CEFC7E9E0723BA31D650F4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AC2E56BF173CFF11005423BA31D69192" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D7FEFA3AE2CEFC7E9E0723BA31D650F4_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D7FEFA3AE2CEFC7E9E0723BA31D650F4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_AC2E56BF173CFF11005423BA31D69192" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D7FEFA3AE2CEFC7E9E0723BA31D650F4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_4A50C4A8DA468C4934A523BA31D63026" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D7FEFA3AE2CEFC7E9E0723BA31D650F4" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_4A50C4A8DA468C4934A523BA31D63026" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_6661374C7EBC3EDA86A523BA31D6CA65" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_D7FEFA3AE2CEFC7E9E0723BA31D650F4" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_6661374C7EBC3EDA86A523BA31D6CA65" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_F62351258C151A9E423723BA31D6C179" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_D7421DCFC9E0766FECD723BA31D6A4A6" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_F62351258C151A9E423723BA31D6C179" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_156E3199F00CD9BBB85523BA31D64C5B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_F62351258C151A9E423723BA31D6C179" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_156E3199F00CD9BBB85523BA31D64C5B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_156E3199F00CD9BBB85523BA31D64C5B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_F62351258C151A9E423723BA31D6C179" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_156E3199F00CD9BBB85523BA31D64C5B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_2AD35462DC96F9C2D30023BA31D61149" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_156E3199F00CD9BBB85523BA31D64C5B" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_2AD35462DC96F9C2D30023BA31D61149" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_42D9C9979A25F6F1FB2423BA31D6524E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_D7421DCFC9E0766FECD723BA31D6A4A6" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_42D9C9979A25F6F1FB2423BA31D6524E" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_FairValueByAssetClassDomain" xlink:label="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_42D9C9979A25F6F1FB2423BA31D6524E" xlink:to="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E_default" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_FairValueByAssetClassDomain" xlink:label="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_42D9C9979A25F6F1FB2423BA31D6524E" xlink:to="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_DemandAndTimeDepositsMember" xlink:label="loc_onnn_DemandAndTimeDepositsMember_A221D90381BF5A00958323BA31D6D576" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:to="loc_onnn_DemandAndTimeDepositsMember_A221D90381BF5A00958323BA31D6D576" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_7CDE50757A8263BE75A423BA31D687B6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:to="loc_us-gaap_MoneyMarketFundsMember_7CDE50757A8263BE75A423BA31D687B6" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TreasuriesAndAgenciesMember" xlink:label="loc_onnn_TreasuriesAndAgenciesMember_208B62ECB828F757B62A23BA31D65955" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:to="loc_onnn_TreasuriesAndAgenciesMember_208B62ECB828F757B62A23BA31D65955" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommercialPaperMember" xlink:label="loc_us-gaap_CommercialPaperMember_C62179C862DC2980EC0323BA31D64716" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:to="loc_us-gaap_CommercialPaperMember_C62179C862DC2980EC0323BA31D64716" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CorporateBondSecuritiesMember" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_62F4FE25AE116323A18123BA31E62399" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_62F4FE25AE116323A18123BA31E62399" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ForeignExchangeContractMember" xlink:label="loc_us-gaap_ForeignExchangeContractMember_ED173507FAAA2AD626FC23BA31E66859" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FairValueByAssetClassDomain_4A78F356264AA4DF338623BA31D6574E" xlink:to="loc_us-gaap_ForeignExchangeContractMember_ED173507FAAA2AD626FC23BA31E66859" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_A1A7C27D01E4ABB6910723BA31E6EB28" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5F9EF3773BD0D4CE03CD23BA31E6193E" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_A1A7C27D01E4ABB6910723BA31E6EB28" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_AA5EFA8410FE0572244823BA31E65551" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5F9EF3773BD0D4CE03CD23BA31E6193E" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_AA5EFA8410FE0572244823BA31E65551" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_19408C64D963DD99FCAF23E52F931834" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_5F9EF3773BD0D4CE03CD23BA31E6193E" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_19408C64D963DD99FCAF23E52F931834" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsFairValueOfShortTermInvestmentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7D7B28EAB6907858FD780CD801DE2174" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0BB76F378645C3B69CAA0CD801DDC1A7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7D7B28EAB6907858FD780CD801DE2174" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0BB76F378645C3B69CAA0CD801DDC1A7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtSecurityAxis" xlink:label="loc_us-gaap_DebtSecurityAxis_DE7C8EF92641EC5504F10CD801DDF728" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0BB76F378645C3B69CAA0CD801DDC1A7" xlink:to="loc_us-gaap_DebtSecurityAxis_DE7C8EF92641EC5504F10CD801DDF728" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_0F5DBB5C692C37DE829C0CD801DD955C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtSecurityAxis_DE7C8EF92641EC5504F10CD801DDF728" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_0F5DBB5C692C37DE829C0CD801DD955C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MajorTypesOfDebtSecuritiesDomain" xlink:label="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_0F5DBB5C692C37DE829C0CD801DD955C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtSecurityAxis_DE7C8EF92641EC5504F10CD801DDF728" xlink:to="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_0F5DBB5C692C37DE829C0CD801DD955C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember" xlink:label="loc_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_D42F09191B66C438B1CB0CD801DE9313" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_0F5DBB5C692C37DE829C0CD801DD955C" xlink:to="loc_us-gaap_CommercialPaperNotIncludedWithCashAndCashEquivalentsMember_D42F09191B66C438B1CB0CD801DE9313" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_E3D41914503D38EF2F1A0CD801DED594" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_0F5DBB5C692C37DE829C0CD801DD955C" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_E3D41914503D38EF2F1A0CD801DED594" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_0C25AAFDD0C3989C329F0D0AEC7F371C" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MajorTypesOfDebtSecuritiesDomain_0F5DBB5C692C37DE829C0CD801DD955C" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_0C25AAFDD0C3989C329F0D0AEC7F371C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_DB9ED9DC1546BD69E9520CD801DE1891" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7D7B28EAB6907858FD780CD801DE2174" xlink:to="loc_us-gaap_ShortTermInvestments_DB9ED9DC1546BD69E9520CD801DE1891" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLoss" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLoss_9ECB5D4FE981BAFE4B7B0CD801DEA72E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7D7B28EAB6907858FD780CD801DE2174" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLoss_9ECB5D4FE981BAFE4B7B0CD801DEA72E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_HeldToMaturitySecuritiesFairValue" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_4340EDB8452D92335B530CD801E4D7D0" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7D7B28EAB6907858FD780CD801DE2174" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_4340EDB8452D92335B530CD801E4D7D0" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsNarrativeDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/FairValueOfFinancialInstrumentsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/FinancialInstruments" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/FinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_444BD684398D81FB9A902AEBDA947E39" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_444BD684398D81FB9A902AEBDA947E39" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_90C172AFD9C02BDFC9FF2AEBDA943FE4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_444BD684398D81FB9A902AEBDA947E39" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_90C172AFD9C02BDFC9FF2AEBDA943FE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_AF184A43FD6848F3E9812AEBDA941154_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_90C172AFD9C02BDFC9FF2AEBDA943FE4" xlink:to="loc_us-gaap_HedgingRelationshipDomain_AF184A43FD6848F3E9812AEBDA941154_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_HedgingRelationshipDomain" xlink:label="loc_us-gaap_HedgingRelationshipDomain_AF184A43FD6848F3E9812AEBDA941154" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_90C172AFD9C02BDFC9FF2AEBDA943FE4" xlink:to="loc_us-gaap_HedgingRelationshipDomain_AF184A43FD6848F3E9812AEBDA941154" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_7C8BDBC011CE02E584292AEBDA94EE04" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_AF184A43FD6848F3E9812AEBDA941154" xlink:to="loc_us-gaap_CashFlowHedgingMember_7C8BDBC011CE02E584292AEBDA94EE04" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_78B91AFA2109C9A91C652AEBDA94621A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_444BD684398D81FB9A902AEBDA947E39" xlink:to="loc_us-gaap_HedgingDesignationAxis_78B91AFA2109C9A91C652AEBDA94621A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_6280E91ECE3F8961613A2AEBDA94A609_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_78B91AFA2109C9A91C652AEBDA94621A" xlink:to="loc_us-gaap_HedgingDesignationDomain_6280E91ECE3F8961613A2AEBDA94A609_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_6280E91ECE3F8961613A2AEBDA94A609" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_78B91AFA2109C9A91C652AEBDA94621A" xlink:to="loc_us-gaap_HedgingDesignationDomain_6280E91ECE3F8961613A2AEBDA94A609" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashFlowHedgingMember" xlink:label="loc_us-gaap_CashFlowHedgingMember_8BA155339324D17AFB6F2AEBDA9497E3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_6280E91ECE3F8961613A2AEBDA94A609" xlink:to="loc_us-gaap_CashFlowHedgingMember_8BA155339324D17AFB6F2AEBDA9497E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_C3CB69259A72AF0130782AEBDA95597A" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_6280E91ECE3F8961613A2AEBDA94A609" xlink:to="loc_us-gaap_NondesignatedMember_C3CB69259A72AF0130782AEBDA95597A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NotionalAmountOfForeignCurrencyDerivatives" xlink:label="loc_us-gaap_NotionalAmountOfForeignCurrencyDerivatives_B779D4EEC70CF13930182AEBDA9597AA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:to="loc_us-gaap_NotionalAmountOfForeignCurrencyDerivatives_B779D4EEC70CF13930182AEBDA9597AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossRealized" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_A725009E73A657909D512AEBDA95DA47" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossRealized_A725009E73A657909D512AEBDA95DA47" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossUnrealized" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_7EBE200A4BD9A5757C8B2AEBDA952485" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossUnrealized_7EBE200A4BD9A5757C8B2AEBDA952485" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_0082D3C816741AA24C802AEBDA957FE9" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:to="loc_us-gaap_OtherAssetsCurrent_0082D3C816741AA24C802AEBDA957FE9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_51E1B5FF88F95004067C2AEBDA95336B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:to="loc_us-gaap_LiabilitiesCurrent_51E1B5FF88F95004067C2AEBDA95336B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_5F113E54BBC8DC884F232AEBDA9599AD" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_6F6AED04FD9ECE0C8A412AEBDA95581A" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax_5F113E54BBC8DC884F232AEBDA9599AD" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/FinancialInstrumentsScheduleOfNetForeignExchangePositionsDetails" xlink:type="extended">
    <loc xlink:href="onnn-20130628.xsd#onnn_FinancialInstrumentsLineItems" xlink:label="loc_onnn_FinancialInstrumentsLineItems_8E7AEB72A9C4E172D45F0CD801B5A18C" xlink:type="locator" />
    <loc xlink:href="onnn-20130628.xsd#onnn_FinancialInstrumentsTable" xlink:label="loc_onnn_FinancialInstrumentsTable_BC00A2E0267A2A0145B20CD801B5378E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_onnn_FinancialInstrumentsLineItems_8E7AEB72A9C4E172D45F0CD801B5A18C" xlink:to="loc_onnn_FinancialInstrumentsTable_BC00A2E0267A2A0145B20CD801B5378E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis" xlink:label="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis_7360464F23585273BC540CD801B539F3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_onnn_FinancialInstrumentsTable_BC00A2E0267A2A0145B20CD801B5378E" xlink:to="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis_7360464F23585273BC540CD801B539F3" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain" xlink:label="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis_7360464F23585273BC540CD801B539F3" xlink:to="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938_default" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain" xlink:label="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesAxis_7360464F23585273BC540CD801B539F3" xlink:to="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd#currency_EUR" xlink:label="loc_currency_EUR_E79070545C691EA9211A0CD801B564B2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938" xlink:to="loc_currency_EUR_E79070545C691EA9211A0CD801B564B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd#currency_JPY" xlink:label="loc_currency_JPY_42292FB874345B007F870CD801B5F672" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938" xlink:to="loc_currency_JPY_42292FB874345B007F870CD801B5F672" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd#currency_MYR" xlink:label="loc_currency_MYR_B7056543D91756F5ABB90CD801B53EE4" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938" xlink:to="loc_currency_MYR_B7056543D91756F5ABB90CD801B53EE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/currency/2012/currency-2012-01-31.xsd#currency_PHP" xlink:label="loc_currency_PHP_736FEED27A76766DE1A10D0D332CD7B6" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938" xlink:to="loc_currency_PHP_736FEED27A76766DE1A10D0D332CD7B6" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherCurrenciesMember" xlink:label="loc_onnn_OtherCurrenciesMember_7D600B7A23F5BF8F394C0CD801B50E47" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_ForeignCurrencyContractByUnderlyingCurrenciesDomain_F581BAB104952A93517E0CD801B59938" xlink:to="loc_onnn_OtherCurrenciesMember_7D600B7A23F5BF8F394C0CD801B50E47" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet" xlink:label="loc_onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet_B1FD981DE6EA10B5C15D0CD801B595D8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FinancialInstrumentsLineItems_8E7AEB72A9C4E172D45F0CD801B5A18C" xlink:to="loc_onnn_NotionalAmountOfForeignCurrencyDerivativePurchaseSaleAndContractsNet_B1FD981DE6EA10B5C15D0CD801B595D8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NotionalAmountOfForeignCurrencyDerivatives" xlink:label="loc_us-gaap_NotionalAmountOfForeignCurrencyDerivatives_5C5060CDD8E594ED1D020CD801B7A010" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_FinancialInstrumentsLineItems_8E7AEB72A9C4E172D45F0CD801B5A18C" xlink:to="loc_us-gaap_NotionalAmountOfForeignCurrencyDerivatives_5C5060CDD8E594ED1D020CD801B7A010" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/FinancialInstrumentsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/GoodwillAndIntangibleAssets" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsNarrativeDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsSummaryOfAmortizationExpenseDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsSummaryOfGoodwillByOperatingSegmentDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_AD3C5E1A7DCF021FD09123BA334D95A3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfGoodwillTable" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_4CA7B39EAA2EA2201DB823BA334D1CAC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_AD3C5E1A7DCF021FD09123BA334D95A3" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_4CA7B39EAA2EA2201DB823BA334D1CAC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_FFDF830C8E039692152223BA334DC309" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_4CA7B39EAA2EA2201DB823BA334D1CAC" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_FFDF830C8E039692152223BA334DC309" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_CE44924E480C1A2267D223BA334D58C5_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FFDF830C8E039692152223BA334DC309" xlink:to="loc_us-gaap_SegmentDomain_CE44924E480C1A2267D223BA334D58C5_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_CE44924E480C1A2267D223BA334D58C5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FFDF830C8E039692152223BA334DC309" xlink:to="loc_us-gaap_SegmentDomain_CE44924E480C1A2267D223BA334D58C5" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AutomotiveIndustrialMedicalAndMilAeroMember" xlink:label="loc_onnn_AutomotiveIndustrialMedicalAndMilAeroMember_134003DF76C4A631B9FE23BA334DCCF6" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_CE44924E480C1A2267D223BA334D58C5" xlink:to="loc_onnn_AutomotiveIndustrialMedicalAndMilAeroMember_134003DF76C4A631B9FE23BA334DCCF6" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_StandardProductsMember" xlink:label="loc_onnn_StandardProductsMember_7E52B274CF65740AF8CA23BA334D62AA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_CE44924E480C1A2267D223BA334D58C5" xlink:to="loc_onnn_StandardProductsMember_7E52B274CF65740AF8CA23BA334D62AA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillGross" xlink:label="loc_us-gaap_GoodwillGross_DE1A40D26851660E77E323BA334D762F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_AD3C5E1A7DCF021FD09123BA334D95A3" xlink:to="loc_us-gaap_GoodwillGross_DE1A40D26851660E77E323BA334D762F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GoodwillImpairedAccumulatedImpairmentLoss" xlink:label="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_CF6767B4DEE18E55C2AF23BA334D40FF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_AD3C5E1A7DCF021FD09123BA334D95A3" xlink:to="loc_us-gaap_GoodwillImpairedAccumulatedImpairmentLoss_CF6767B4DEE18E55C2AF23BA334D40FF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_7AF7FACAAE3062E7CC4723BA334D4B75" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_AD3C5E1A7DCF021FD09123BA334D95A3" xlink:to="loc_us-gaap_Goodwill_7AF7FACAAE3062E7CC4723BA334D4B75" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsSummaryOfIntangibleAssetsNetDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4893315B0A89C248730704B96A9A099D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4893315B0A89C248730704B96A9A099D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_56889F9CE7D7FF057D9104B96A9A9A15" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4893315B0A89C248730704B96A9A099D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_56889F9CE7D7FF057D9104B96A9A9A15" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_56889F9CE7D7FF057D9104B96A9A9A15" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_56889F9CE7D7FF057D9104B96A9A9A15" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_IntellectualPropertyMember" xlink:label="loc_onnn_IntellectualPropertyMember_8E00350ECB8086219F2404B96A9AA04E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C" xlink:to="loc_onnn_IntellectualPropertyMember_8E00350ECB8086219F2404B96A9AA04E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_80E7A1F2EA00B55C2ECA04B96A9A5F67" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C" xlink:to="loc_us-gaap_CustomerRelationshipsMember_80E7A1F2EA00B55C2ECA04B96A9A5F67" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PatentsMember" xlink:label="loc_us-gaap_PatentsMember_65FD56711CED5FD3BAC804B96A9AA669" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C" xlink:to="loc_us-gaap_PatentsMember_65FD56711CED5FD3BAC804B96A9AA669" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_1C91AEC78620A1F092D104B96A9AF069" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_1C91AEC78620A1F092D104B96A9AF069" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TrademarksMember" xlink:label="loc_us-gaap_TrademarksMember_144077BF93D04FD7F45504B96A9A35EE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_64A1E976B911F2B2B4E004B96A9ADD4C" xlink:to="loc_us-gaap_TrademarksMember_144077BF93D04FD7F45504B96A9A35EE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_DA56290F26CDF9633A0A04B96A9A26AB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_4893315B0A89C248730704B96A9A099D" xlink:to="loc_us-gaap_RangeAxis_DA56290F26CDF9633A0A04B96A9A26AB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_9A25A5A59BBF01A7662D04B96A9ACBC2_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_DA56290F26CDF9633A0A04B96A9A26AB" xlink:to="loc_us-gaap_RangeMember_9A25A5A59BBF01A7662D04B96A9ACBC2_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_9A25A5A59BBF01A7662D04B96A9ACBC2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_DA56290F26CDF9633A0A04B96A9A26AB" xlink:to="loc_us-gaap_RangeMember_9A25A5A59BBF01A7662D04B96A9ACBC2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_04FA777D64159863DF3104B96A9A0FB7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_9A25A5A59BBF01A7662D04B96A9ACBC2" xlink:to="loc_us-gaap_MinimumMember_04FA777D64159863DF3104B96A9A0FB7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_4659D77F2420C3D73A5504B96A9A862F" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_9A25A5A59BBF01A7662D04B96A9ACBC2" xlink:to="loc_us-gaap_MaximumMember_4659D77F2420C3D73A5504B96A9A862F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_A05D174867A7364ED2AC04B96A9AC1FC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_A05D174867A7364ED2AC04B96A9AC1FC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A35747662EC123BDA61404B96A9AC288" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_A35747662EC123BDA61404B96A9AC288" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_FiniteLivedIntangibleAssetsForeignCurrencyTranslationImpairmentAdjustment" xlink:label="loc_onnn_FiniteLivedIntangibleAssetsForeignCurrencyTranslationImpairmentAdjustment_A4244C2EFDE03F2C9D2104B96A9A1987" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:to="loc_onnn_FiniteLivedIntangibleAssetsForeignCurrencyTranslationImpairmentAdjustment_A4244C2EFDE03F2C9D2104B96A9A1987" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_C514861291D24631206904B96A9AB6A8" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill_C514861291D24631206904B96A9AB6A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_57EF2ED71CD40274C67004B96A9A8D0A" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_57EF2ED71CD40274C67004B96A9A8D0A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_E8042CEACC56BB438A0804B96A9AFCAC" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_90734B1D3867DFCF27AB04B96A9ABCB6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_E8042CEACC56BB438A0804B96A9AFCAC" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/GoodwillAndIntangibleAssetsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatements" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsCorrectionsToGuarantorAndNonGuarantorStatementsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems" xlink:label="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems_C76E79B98D2D5DFD29EA2FF902FF4C6F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfQuantifyingPriorYearMisstatementCorrectedInCurrentYearFinancialStatementsTable" xlink:label="loc_us-gaap_ScheduleOfQuantifyingPriorYearMisstatementCorrectedInCurrentYearFinancialStatementsTable_9FFB760E44471FEDBBFB2FF902FF06BB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems_C76E79B98D2D5DFD29EA2FF902FF4C6F" xlink:to="loc_us-gaap_ScheduleOfQuantifyingPriorYearMisstatementCorrectedInCurrentYearFinancialStatementsTable_9FFB760E44471FEDBBFB2FF902FF06BB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_B67CE912A76F9C2FA46F2FF902FF85D0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfQuantifyingPriorYearMisstatementCorrectedInCurrentYearFinancialStatementsTable_9FFB760E44471FEDBBFB2FF902FF06BB" xlink:to="loc_us-gaap_StatementScenarioAxis_B67CE912A76F9C2FA46F2FF902FF85D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_79F3EC6589AEC1DA313F2FF902FF0AFE_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_B67CE912A76F9C2FA46F2FF902FF85D0" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_79F3EC6589AEC1DA313F2FF902FF0AFE_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_79F3EC6589AEC1DA313F2FF902FF0AFE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_B67CE912A76F9C2FA46F2FF902FF85D0" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_79F3EC6589AEC1DA313F2FF902FF0AFE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScenarioPreviouslyReportedMember" xlink:label="loc_us-gaap_ScenarioPreviouslyReportedMember_980A7741A420CE3135142FF902FFC857" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_79F3EC6589AEC1DA313F2FF902FF0AFE" xlink:to="loc_us-gaap_ScenarioPreviouslyReportedMember_980A7741A420CE3135142FF902FFC857" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_0C7E60BF52CDC42F7F882FF902FF909D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfQuantifyingPriorYearMisstatementCorrectedInCurrentYearFinancialStatementsTable_9FFB760E44471FEDBBFB2FF902FF06BB" xlink:to="loc_dei_LegalEntityAxis_0C7E60BF52CDC42F7F882FF902FF909D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_0C7E60BF52CDC42F7F882FF902FF909D" xlink:to="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_0C7E60BF52CDC42F7F882FF902FF909D" xlink:to="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_IssuerMember" xlink:label="loc_onnn_IssuerMember_AC1830AB7F1C0ED337E62FF902FF7E0D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158" xlink:to="loc_onnn_IssuerMember_AC1830AB7F1C0ED337E62FF902FF7E0D" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ScillcMember" xlink:label="loc_onnn_ScillcMember_B204644F61B019B043682FF902FF44EB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158" xlink:to="loc_onnn_ScillcMember_B204644F61B019B043682FF902FF44EB" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherSubsidiariesMember" xlink:label="loc_onnn_OtherSubsidiariesMember_CCFD76C1AF2C2D0A659F2FF902FF74E9" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158" xlink:to="loc_onnn_OtherSubsidiariesMember_CCFD76C1AF2C2D0A659F2FF902FF74E9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NonGuarantorSubsidiariesMember" xlink:label="loc_us-gaap_NonGuarantorSubsidiariesMember_387DFCB7AAA5485612662FF902FFD7B2" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158" xlink:to="loc_us-gaap_NonGuarantorSubsidiariesMember_387DFCB7AAA5485612662FF902FFD7B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConsolidationEliminationsMember" xlink:label="loc_us-gaap_ConsolidationEliminationsMember_BC853A1D6C928AC221792FF902FF0375" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_430764EBCF0326BD9A832FF902FF0158" xlink:to="loc_us-gaap_ConsolidationEliminationsMember_BC853A1D6C928AC221792FF902FF0375" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_554A1C9150D4F42DEAD22FF902FF505E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfQuantifyingPriorYearMisstatementCorrectedInCurrentYearFinancialStatementsTable_9FFB760E44471FEDBBFB2FF902FF06BB" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_554A1C9150D4F42DEAD22FF902FF505E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_3157DB282A8BE51A2FE32FF902FF945E_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_554A1C9150D4F42DEAD22FF902FF505E" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_3157DB282A8BE51A2FE32FF902FF945E_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_3157DB282A8BE51A2FE32FF902FF945E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_554A1C9150D4F42DEAD22FF902FF505E" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_3157DB282A8BE51A2FE32FF902FF945E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsMember" xlink:label="loc_us-gaap_AssetsMember_1B9C6CDD240CC538942A2FF902FFAD34" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_3157DB282A8BE51A2FE32FF902FF945E" xlink:to="loc_us-gaap_AssetsMember_1B9C6CDD240CC538942A2FF902FFAD34" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ShortTermIntercompanyAndCurrentAssetsMember" xlink:label="loc_onnn_ShortTermIntercompanyAndCurrentAssetsMember_7DB718358B88CFD048432FF902FFD5EB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsMember_1B9C6CDD240CC538942A2FF902FFAD34" xlink:to="loc_onnn_ShortTermIntercompanyAndCurrentAssetsMember_7DB718358B88CFD048432FF902FFD5EB" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LongTermIntercompanyAndAssetsMember" xlink:label="loc_onnn_LongTermIntercompanyAndAssetsMember_ECD66CA42F3D1B14BEE62FF902FFD132" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsMember_1B9C6CDD240CC538942A2FF902FFAD34" xlink:to="loc_onnn_LongTermIntercompanyAndAssetsMember_ECD66CA42F3D1B14BEE62FF902FFD132" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LiabilitiesMember" xlink:label="loc_onnn_LiabilitiesMember_CB4145981655B6B65E562FF902FF4E74" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_3157DB282A8BE51A2FE32FF902FF945E" xlink:to="loc_onnn_LiabilitiesMember_CB4145981655B6B65E562FF902FF4E74" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ShortTermIntercompanyAndCurrentLiabilitiesMember" xlink:label="loc_onnn_ShortTermIntercompanyAndCurrentLiabilitiesMember_B2705683366AD22D433C2FF902FFEB4F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_LiabilitiesMember_CB4145981655B6B65E562FF902FF4E74" xlink:to="loc_onnn_ShortTermIntercompanyAndCurrentLiabilitiesMember_B2705683366AD22D433C2FF902FFEB4F" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LongTermIntercompanyAndLiabilitiesMember" xlink:label="loc_onnn_LongTermIntercompanyAndLiabilitiesMember_1EDDE809D21A6B0943E42FF902FF5E36" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_LiabilitiesMember_CB4145981655B6B65E562FF902FF4E74" xlink:to="loc_onnn_LongTermIntercompanyAndLiabilitiesMember_1EDDE809D21A6B0943E42FF902FF5E36" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount" xlink:label="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount_1E244738D030D9CDBD442FF902FF3695" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems_C76E79B98D2D5DFD29EA2FF902FF4C6F" xlink:to="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsAmount_1E244738D030D9CDBD442FF902FF3695" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueFromRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueFromRelatedPartiesNoncurrent_65282EA0A5369BB305372FF902FF93B3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems_C76E79B98D2D5DFD29EA2FF902FF4C6F" xlink:to="loc_us-gaap_DueFromRelatedPartiesNoncurrent_65282EA0A5369BB305372FF902FF93B3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_FA9EBE93F8D1F5E6C7C02FF902FF8744" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems_C76E79B98D2D5DFD29EA2FF902FF4C6F" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_FA9EBE93F8D1F5E6C7C02FF902FF8744" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueToRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrent_959E4F2B705ABD00BB722FF902FFB6C7" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems_C76E79B98D2D5DFD29EA2FF902FF4C6F" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrent_959E4F2B705ABD00BB722FF902FFB6C7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueToRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_C0DB79F2AC53F6B02AC92FF902FF3799" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_QuantifyingMisstatementInCurrentYearFinancialStatementsLineItems_C76E79B98D2D5DFD29EA2FF902FF4C6F" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_C0DB79F2AC53F6B02AC92FF902FF3799" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfBalanceSheetDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_4911BB3B018FC21F49E72FF90327A379" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_4911BB3B018FC21F49E72FF90327A379" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_9F1516F5911010C7A6CD2FF90327A34D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_4911BB3B018FC21F49E72FF90327A379" xlink:to="loc_dei_LegalEntityAxis_9F1516F5911010C7A6CD2FF90327A34D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_9F1516F5911010C7A6CD2FF90327A34D" xlink:to="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_9F1516F5911010C7A6CD2FF90327A34D" xlink:to="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_IssuerMember" xlink:label="loc_onnn_IssuerMember_01119A159B53146BF6552FF90327DC41" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11" xlink:to="loc_onnn_IssuerMember_01119A159B53146BF6552FF90327DC41" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ScillcMember" xlink:label="loc_onnn_ScillcMember_862DC27B0455E0B1FCAD2FF903276821" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11" xlink:to="loc_onnn_ScillcMember_862DC27B0455E0B1FCAD2FF903276821" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherSubsidiariesMember" xlink:label="loc_onnn_OtherSubsidiariesMember_E491D259CBEDAE52BB732FF903279705" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11" xlink:to="loc_onnn_OtherSubsidiariesMember_E491D259CBEDAE52BB732FF903279705" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NonGuarantorSubsidiariesMember" xlink:label="loc_us-gaap_NonGuarantorSubsidiariesMember_1445BE83EE506AEB4E482FF903273C8C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11" xlink:to="loc_us-gaap_NonGuarantorSubsidiariesMember_1445BE83EE506AEB4E482FF903273C8C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConsolidationEliminationsMember" xlink:label="loc_us-gaap_ConsolidationEliminationsMember_8C3CD72778DB8290E6BD2FF90327FB0B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_A6D876427D3892FCD3322FF90327AA11" xlink:to="loc_us-gaap_ConsolidationEliminationsMember_8C3CD72778DB8290E6BD2FF90327FB0B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3F657EBD7B01E819A3612FF903272F23" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_3F657EBD7B01E819A3612FF903272F23" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1222CFD0F67C8380F1D32FF9032740B2" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_1222CFD0F67C8380F1D32FF9032740B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShortTermInvestments" xlink:label="loc_us-gaap_ShortTermInvestments_4F1011AA510DA5E879012FF903276CBF" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_ShortTermInvestments_4F1011AA510DA5E879012FF903276CBF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReceivablesNetCurrent" xlink:label="loc_us-gaap_ReceivablesNetCurrent_02204B8D5D88C2AA767C2FF903274ABE" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_ReceivablesNetCurrent_02204B8D5D88C2AA767C2FF903274ABE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_us-gaap_InventoryNet_36DDFD52DA16979EF20D2FF903278604" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_InventoryNet_36DDFD52DA16979EF20D2FF903278604" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueFromRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueFromRelatedPartiesCurrent_0A6FC2F93D50BC5D16DF2FF90327BF05" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DueFromRelatedPartiesCurrent_0A6FC2F93D50BC5D16DF2FF90327BF05" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_us-gaap_OtherAssetsCurrent_3121440670BA74A2A9612FF90327DD7E" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_OtherAssetsCurrent_3121440670BA74A2A9612FF90327DD7E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxAssetsNetCurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetCurrent_1A80E92AFFFF33D174662FF90327460C" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DeferredTaxAssetsNetCurrent_1A80E92AFFFF33D174662FF90327460C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_us-gaap_AssetsCurrent_4181B24C7B009B2848C52FF90327EB5E" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_AssetsCurrent_4181B24C7B009B2848C52FF90327EB5E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_6B654B67E5DACFACFCD62FF903275079" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_6B654B67E5DACFACFCD62FF903275079" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxAssetsNetNoncurrent" xlink:label="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_99DA26B27F437A14325B2FF90327551F" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DeferredTaxAssetsNetNoncurrent_99DA26B27F437A14325B2FF90327551F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_52BACCE3C34F447B492F2FF90327381A" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_Goodwill_52BACCE3C34F447B492F2FF90327381A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_6B7DD3E5993AF3BD7C5A2FF90327E2FD" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_6B7DD3E5993AF3BD7C5A2FF90327E2FD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueFromRelatedPartiesNoncurrent" xlink:label="loc_us-gaap_DueFromRelatedPartiesNoncurrent_DAF9978886115B4C446A2FF90327EDE9" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DueFromRelatedPartiesNoncurrent_DAF9978886115B4C446A2FF90327EDE9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_ABF72A7AA0960874A7902FF9032754CE" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_ABF72A7AA0960874A7902FF9032754CE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_00FBCAAEEC4BA6F4A1A22FF90327EA46" xlink:type="locator" />
    <definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_Assets_00FBCAAEEC4BA6F4A1A22FF90327EA46" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_us-gaap_AccountsPayableCurrent_A98EEBD12D452C0D6C382FF90327EC74" xlink:type="locator" />
    <definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_AccountsPayableCurrent_A98EEBD12D452C0D6C382FF90327EC74" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_4B249A7C4B9845D3C4652FF903279447" xlink:type="locator" />
    <definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_4B249A7C4B9845D3C4652FF903279447" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_247EC8A35CF9DEC74EC22FF90327A4D8" xlink:type="locator" />
    <definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_247EC8A35CF9DEC74EC22FF90327A4D8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestPayableCurrent" xlink:label="loc_us-gaap_InterestPayableCurrent_9BF0E23975DB2A53E0252FF9032745F3" xlink:type="locator" />
    <definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_InterestPayableCurrent_9BF0E23975DB2A53E0252FF9032745F3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredRevenueCurrent" xlink:label="loc_us-gaap_DeferredRevenueCurrent_601DB6DBCEFF7FD2DBDF2FF90327AA59" xlink:type="locator" />
    <definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DeferredRevenueCurrent_601DB6DBCEFF7FD2DBDF2FF90327AA59" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxLiabilitiesCurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesCurrent_018D4A7D5B015CA14B742FF903273E00" xlink:type="locator" />
    <definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesCurrent_018D4A7D5B015CA14B742FF903273E00" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_22166A895612D0DFE6EB2FF90327F354" xlink:type="locator" />
    <definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_LongTermDebtCurrent_22166A895612D0DFE6EB2FF90327F354" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueToRelatedPartiesCurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrent_61009AE424ADCE6FB3002FF9032709D9" xlink:type="locator" />
    <definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrent_61009AE424ADCE6FB3002FF9032709D9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_us-gaap_LiabilitiesCurrent_C8BED1E830796FF5E0EC2FF9032745B1" xlink:type="locator" />
    <definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_LiabilitiesCurrent_C8BED1E830796FF5E0EC2FF9032745B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_DAB914E57BE65A4A00D62FF903275689" xlink:type="locator" />
    <definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_DAB914E57BE65A4A00D62FF903275689" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_CEBADA0F58AC6BC866072FF903271021" xlink:type="locator" />
    <definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_CEBADA0F58AC6BC866072FF903271021" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_6ED931F9ACA9E55503A22FF903272E78" xlink:type="locator" />
    <definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesNoncurrent_6ED931F9ACA9E55503A22FF903272E78" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DueToRelatedPartiesCurrentAndNoncurrent" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_CA69FF6A7FF2174005CD2FF90327251A" xlink:type="locator" />
    <definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrentAndNoncurrent_CA69FF6A7FF2174005CD2FF90327251A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_us-gaap_Liabilities_8A84E076971DC969205F2FF90327B2D1" xlink:type="locator" />
    <definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_Liabilities_8A84E076971DC969205F2FF90327B2D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_us-gaap_CommonStockValue_653AA8F89F343D636FAB2FF90327FDFA" xlink:type="locator" />
    <definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_CommonStockValue_653AA8F89F343D636FAB2FF90327FDFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_us-gaap_AdditionalPaidInCapital_5D79CC7A2EC90A41BEEB2FF903278426" xlink:type="locator" />
    <definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_AdditionalPaidInCapital_5D79CC7A2EC90A41BEEB2FF903278426" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DBE233B90456A3305F412FF90327A869" xlink:type="locator" />
    <definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_DBE233B90456A3305F412FF90327A869" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_6189D6C098E5180C60C82FF90327922E" xlink:type="locator" />
    <definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_6189D6C098E5180C60C82FF90327922E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="loc_us-gaap_TreasuryStockValue_8B39655531FF122C97502FF90327C72A" xlink:type="locator" />
    <definitionArc order="35" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_TreasuryStockValue_8B39655531FF122C97502FF90327C72A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_38250BBB28DACB8CBE3D2FF903273AC3" xlink:type="locator" />
    <definitionArc order="36" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_StockholdersEquity_38250BBB28DACB8CBE3D2FF903273AC3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_us-gaap_MinorityInterest_5CF94626F87E13EB813B2FF903271C1E" xlink:type="locator" />
    <definitionArc order="37" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_MinorityInterest_5CF94626F87E13EB813B2FF903271C1E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ACFDD65CB84454F745172FF903279631" xlink:type="locator" />
    <definitionArc order="38" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ACFDD65CB84454F745172FF903279631" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_4BB6AA084F230368E0D72FF903279C3B" xlink:type="locator" />
    <definitionArc order="39" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_035E806B09D47699EDD52FF90327E888" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_4BB6AA084F230368E0D72FF903279C3B" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfCashFlowsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_F6A2E3A125F41EF519E8303991809A75" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:to="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_F6A2E3A125F41EF519E8303991809A75" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_69BC70484A25E1DB95C1303991800053" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_F6A2E3A125F41EF519E8303991809A75" xlink:to="loc_dei_LegalEntityAxis_69BC70484A25E1DB95C1303991800053" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_69BC70484A25E1DB95C1303991800053" xlink:to="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_69BC70484A25E1DB95C1303991800053" xlink:to="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_IssuerMember" xlink:label="loc_onnn_IssuerMember_45314758EDAC030A36DF30399180E725" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717" xlink:to="loc_onnn_IssuerMember_45314758EDAC030A36DF30399180E725" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ScillcMember" xlink:label="loc_onnn_ScillcMember_79334EC782F9CBC8C462303991806A67" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717" xlink:to="loc_onnn_ScillcMember_79334EC782F9CBC8C462303991806A67" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherSubsidiariesMember" xlink:label="loc_onnn_OtherSubsidiariesMember_9FBBEDD9CDFC0C70E66130399180CC8F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717" xlink:to="loc_onnn_OtherSubsidiariesMember_9FBBEDD9CDFC0C70E66130399180CC8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NonGuarantorSubsidiariesMember" xlink:label="loc_us-gaap_NonGuarantorSubsidiariesMember_348FDDDE4E31722EE49430399180648D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717" xlink:to="loc_us-gaap_NonGuarantorSubsidiariesMember_348FDDDE4E31722EE49430399180648D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConsolidationEliminationsMember" xlink:label="loc_us-gaap_ConsolidationEliminationsMember_98390F3DF77D20C223F5303991808B0E" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_DCF818B1803354AFD3D9303991801717" xlink:to="loc_us-gaap_ConsolidationEliminationsMember_98390F3DF77D20C223F5303991808B0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_F004ECD4BB59F229C00A30399180C3D7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_F004ECD4BB59F229C00A30399180C3D7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B299740CD242F1174A6830399180A89F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_B299740CD242F1174A6830399180A89F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_86B27EF225BB49175D39303991808D95" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_86B27EF225BB49175D39303991808D95" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncreaseDecreaseInEarnestMoneyDepositsOutstanding" xlink:label="loc_us-gaap_IncreaseDecreaseInEarnestMoneyDepositsOutstanding_85199BE797C6308909F23039918007E3" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_us-gaap_IncreaseDecreaseInEarnestMoneyDepositsOutstanding_85199BE797C6308909F23039918007E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromInsuranceSettlementInvestingActivities" xlink:label="loc_us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_0BEB5EFC2AF9904C4098303991805E46" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_0BEB5EFC2AF9904C4098303991805E46" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities_7F2E8E9970E92F8FC14C30399180A52D" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfHeldToMaturitySecurities_7F2E8E9970E92F8FC14C30399180A52D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_46BBA5D54741A38BD9B73039918017B8" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_46BBA5D54741A38BD9B73039918017B8" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_PaymentsToConsolidatedSubsidiariesFromParent" xlink:label="loc_onnn_PaymentsToConsolidatedSubsidiariesFromParent_1C4B16F8B22CA0C8B0BE303991803533" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_onnn_PaymentsToConsolidatedSubsidiariesFromParent_1C4B16F8B22CA0C8B0BE303991803533" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1ADA38B620200A4D6F33303991804ACE" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_703128B6D8E3997D152130399180D6CB" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1ADA38B620200A4D6F33303991804ACE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_PaymentForProceedsFromIntercompanyLoans" xlink:label="loc_onnn_PaymentForProceedsFromIntercompanyLoans_7DC136216366281236B8303991804D91" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_onnn_PaymentForProceedsFromIntercompanyLoans_7DC136216366281236B8303991804D91" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_IntercompanyLoanRepayments" xlink:label="loc_onnn_IntercompanyLoanRepayments_F67886DB8ED2CCB6E8D930399180B6E7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_onnn_IntercompanyLoanRepayments_F67886DB8ED2CCB6E8D930399180B6E7" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_PaymentsToParentFromConsolidatedSubsidiaries" xlink:label="loc_onnn_PaymentsToParentFromConsolidatedSubsidiaries_F806B899FB267E109BA230399180E4E2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_onnn_PaymentsToParentFromConsolidatedSubsidiaries_F806B899FB267E109BA230399180E4E2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans_5299E647FD56FA493CA730399180DFCF" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans_5299E647FD56FA493CA730399180DFCF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_C90940E03FD96F7F69B53039918024BE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_C90940E03FD96F7F69B53039918024BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_B98B54A89D497FE15C4E303991808017" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_B98B54A89D497FE15C4E303991808017" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_25A4BCE3EF0DE386FF4430399180A658" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_25A4BCE3EF0DE386FF4430399180A658" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromIssuanceOfDebt" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_252BAAC93C50D76200FC303991801E50" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_252BAAC93C50D76200FC303991801E50" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RepaymentsOfLongTermCapitalLeaseObligations" xlink:label="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_C28164273F8332D9F4213039918AC9F9" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_RepaymentsOfLongTermCapitalLeaseObligations_C28164273F8332D9F4213039918AC9F9" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_E80C7795C8142D6A7F513039918AA1A1" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_E80C7795C8142D6A7F513039918AA1A1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_DEEAE60D2F12E37C88ED3039918A86B1" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_56CAE3CA3C70774278E730399180BB74" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_DEEAE60D2F12E37C88ED3039918A86B1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_783E5679435A939A50083039918A6070" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents_783E5679435A939A50083039918A6070" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_6BB09BF904FA7927BF6C3039918A2D8F" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:to="loc_us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease_6BB09BF904FA7927BF6C3039918A2D8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_B13602C268407CBDF98C3039918AFD43" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_8CC9491BBDCDA40C4BDE30399180FB8D" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_B13602C268407CBDF98C3039918AFD43" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsNotesToConsolidatedStatementOfOperationsAndComprehensiveIncomeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CondensedFinancialStatementsCaptionsLineItems" xlink:label="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfCondensedFinancialStatementsTable" xlink:label="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_D61FAD911E52BE5143E830386314530B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_D61FAD911E52BE5143E830386314530B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_LegalEntityAxis" xlink:label="loc_dei_LegalEntityAxis_731DCD546969CCC749EA30386314DD59" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCondensedFinancialStatementsTable_D61FAD911E52BE5143E830386314530B" xlink:to="loc_dei_LegalEntityAxis_731DCD546969CCC749EA30386314DD59" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_731DCD546969CCC749EA30386314DD59" xlink:to="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd#dei_EntityDomain" xlink:label="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_731DCD546969CCC749EA30386314DD59" xlink:to="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_IssuerMember" xlink:label="loc_onnn_IssuerMember_EE711CA6B861696B619F303863143ED4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C" xlink:to="loc_onnn_IssuerMember_EE711CA6B861696B619F303863143ED4" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ScillcMember" xlink:label="loc_onnn_ScillcMember_23D063DF0C42065189DB303863149055" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C" xlink:to="loc_onnn_ScillcMember_23D063DF0C42065189DB303863149055" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherSubsidiariesMember" xlink:label="loc_onnn_OtherSubsidiariesMember_795E402E291CE55746A93038631488BC" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C" xlink:to="loc_onnn_OtherSubsidiariesMember_795E402E291CE55746A93038631488BC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NonGuarantorSubsidiariesMember" xlink:label="loc_us-gaap_NonGuarantorSubsidiariesMember_93A474049327AA8589CC30386314738C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C" xlink:to="loc_us-gaap_NonGuarantorSubsidiariesMember_93A474049327AA8589CC30386314738C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ConsolidationEliminationsMember" xlink:label="loc_us-gaap_ConsolidationEliminationsMember_0AA0F7D471C0C4CC5D9B30386314BC63" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_780AE2B32F5DFA00A05D30386314E75C" xlink:to="loc_us-gaap_ConsolidationEliminationsMember_0AA0F7D471C0C4CC5D9B30386314BC63" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_A8F7F250B29F19F996C8303863145ABE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_Revenues_A8F7F250B29F19F996C8303863145ABE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_us-gaap_CostOfRevenue_C66D32BE952F0FC211E1303863141186" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_CostOfRevenue_C66D32BE952F0FC211E1303863141186" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_3D9731136E225924A58A30386314AAFB" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_GrossProfit_3D9731136E225924A58A30386314AAFB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_432BF8E11DCD5DE25CEE303863144AFE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost_432BF8E11DCD5DE25CEE303863144AFE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SellingAndMarketingExpense" xlink:label="loc_us-gaap_SellingAndMarketingExpense_0CBD83229A3C9191208D3038631404FE" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:to="loc_us-gaap_SellingAndMarketingExpense_0CBD83229A3C9191208D3038631404FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_03CC7ACD50603650BF2A303863145831" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_03CC7ACD50603650BF2A303863145831" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AmortizationOfAcquiredIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfAcquiredIntangibleAssets_3A076C96D26D4543238B30386314A957" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:to="loc_us-gaap_AmortizationOfAcquiredIntangibleAssets_3A076C96D26D4543238B30386314A957" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_68B5766F47191BECE1B4303863145B70" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:to="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_68B5766F47191BECE1B4303863145B70" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_A7E2FD116E15BEA98EF83038631435A6" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:to="loc_us-gaap_OperatingExpenses_A7E2FD116E15BEA98EF83038631435A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_5DD30CBD65312C53F2BA30386314993F" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_A6EACFCCBF79F5ECAF8330386314FA3E" xlink:to="loc_us-gaap_OperatingIncomeLoss_5DD30CBD65312C53F2BA30386314993F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherIncomeAndExpensesAbstract" xlink:label="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_68E0DB1A8BD39138F2B73038631488A2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:to="loc_us-gaap_InterestExpense_68E0DB1A8BD39138F2B73038631488A2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InvestmentIncomeInterest" xlink:label="loc_us-gaap_InvestmentIncomeInterest_D0AE28F4A8E38DD498AF303863149084" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:to="loc_us-gaap_InvestmentIncomeInterest_D0AE28F4A8E38DD498AF303863149084" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_1AC32E09B5B0740321003038631488D8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_1AC32E09B5B0740321003038631488D8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_49DB6596BF7FDB59FB34303863146F16" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_49DB6596BF7FDB59FB34303863146F16" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_EquityInSubsidiariesEarnings" xlink:label="loc_onnn_EquityInSubsidiariesEarnings_82DBCA6354C6D2DF566530386314B639" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:to="loc_onnn_EquityInSubsidiariesEarnings_82DBCA6354C6D2DF566530386314B639" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_37B3E142889DC5F7597530386314EC3E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherIncomeAndExpensesAbstract_F21D1FC09DE19F57A53E30386314D2D6" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_37B3E142889DC5F7597530386314EC3E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_24EBE504EFAE87D97A12303863141B1A" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_24EBE504EFAE87D97A12303863141B1A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_A6C2F531490BD737FD9630386314E4B0" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_A6C2F531490BD737FD9630386314E4B0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_101953BE106A64472C95303863144366" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_ProfitLoss_101953BE106A64472C95303863144366" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_209A2F4A0C25E8360CC730386314FE01" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_209A2F4A0C25E8360CC730386314FE01" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_79E52D2A1CE5FDA5F43A303863141A09" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_NetIncomeLoss_79E52D2A1CE5FDA5F43A303863141A09" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_BFFB74522600587BE79A303863147EDA" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CondensedFinancialStatementsCaptionsLineItems_94951F1D93D1E668968E30386314C5FC" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_BFFB74522600587BE79A303863147EDA" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/GuarantorAndNonGuarantorStatementsTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebt" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebtAcquisitionOfNotePayableToSmbcDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_CBA0B74079E98BC0456A2FE92B8832F8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:to="loc_us-gaap_DebtInstrumentTable_CBA0B74079E98BC0456A2FE92B8832F8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_FinancialInstrumentAxis" xlink:label="loc_us-gaap_FinancialInstrumentAxis_A4D7FEC741718B67575B2FE92B88F1AB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_CBA0B74079E98BC0456A2FE92B8832F8" xlink:to="loc_us-gaap_FinancialInstrumentAxis_A4D7FEC741718B67575B2FE92B88F1AB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_47E8B900657E475F37CE2FE92B886B9C_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_A4D7FEC741718B67575B2FE92B88F1AB" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_47E8B900657E475F37CE2FE92B886B9C_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_47E8B900657E475F37CE2FE92B886B9C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_A4D7FEC741718B67575B2FE92B88F1AB" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_47E8B900657E475F37CE2FE92B886B9C" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SanyoElectricMember" xlink:label="loc_onnn_SanyoElectricMember_4660E2C4C36B85C8BBB92FE92B880676" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_47E8B900657E475F37CE2FE92B886B9C" xlink:to="loc_onnn_SanyoElectricMember_4660E2C4C36B85C8BBB92FE92B880676" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_DebtInstrumentTerm" xlink:label="loc_onnn_DebtInstrumentTerm_2476DD2D6FEE5AEEC0D42FE92B88E8E7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:to="loc_onnn_DebtInstrumentTerm_2476DD2D6FEE5AEEC0D42FE92B88E8E7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_44026148CDD273EA1FFD2FE92B88F9BF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_44026148CDD273EA1FFD2FE92B88F9BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_5CE14C677299FC1B5CC82FE92B88D977" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:to="loc_us-gaap_LongTermDebt_5CE14C677299FC1B5CC82FE92B88D977" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateTerms" xlink:label="loc_us-gaap_DebtInstrumentInterestRateTerms_F459C6B734DE5230614C2FE92B889C72" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:to="loc_us-gaap_DebtInstrumentInterestRateTerms_F459C6B734DE5230614C2FE92B889C72" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_DebtInstrumentMonthlyPaymentPrincipal" xlink:label="loc_onnn_DebtInstrumentMonthlyPaymentPrincipal_DFAD1FBC99D654DC44D62FE92B88B1BF" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:to="loc_onnn_DebtInstrumentMonthlyPaymentPrincipal_DFAD1FBC99D654DC44D62FE92B88B1BF" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RemainingBalanceOfLoanDueInJanuaryTwoThousandEighteen" xlink:label="loc_onnn_RemainingBalanceOfLoanDueInJanuaryTwoThousandEighteen_D743E6831E9E205790302FE92B88909E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_CC1B66BD87E1BC940E6B2FE92B8877DE" xlink:to="loc_onnn_RemainingBalanceOfLoanDueInJanuaryTwoThousandEighteen_D743E6831E9E205790302FE92B88909E" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebtAnnualMaturitiesRelatingToLongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_5562E6546E1432C101D60932B83E0220" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_DebtInstrumentTable_5562E6546E1432C101D60932B83E0220" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_884655245BD0C5D4A45E0932B83F840C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5562E6546E1432C101D60932B83E0220" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_884655245BD0C5D4A45E0932B83F840C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_CD26BD64B7C092D1A0E80932B83F9BAA_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_884655245BD0C5D4A45E0932B83F840C" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_CD26BD64B7C092D1A0E80932B83F9BAA_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_CD26BD64B7C092D1A0E80932B83F9BAA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_884655245BD0C5D4A45E0932B83F840C" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_CD26BD64B7C092D1A0E80932B83F9BAA" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember" xlink:label="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_19E6E5AA0E5A4A896B170932B86EFAC9" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_CD26BD64B7C092D1A0E80932B83F9BAA" xlink:to="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_19E6E5AA0E5A4A896B170932B86EFAC9" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember" xlink:label="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_EBDF7EF364E0078753A40932B87DF752" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_CD26BD64B7C092D1A0E80932B83F9BAA" xlink:to="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_EBDF7EF364E0078753A40932B87DF752" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_F322DACD00BB60D8332408C5378E56E3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_F322DACD00BB60D8332408C5378E56E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_E30B777F13A275BCE53F08C5378E1840" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_E30B777F13A275BCE53F08C5378E1840" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_3F63961F0F912846494608C5378EA649" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_3F63961F0F912846494608C5378EA649" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_D56F9BE7F4EAD84E2AE708C5378E1152" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_D56F9BE7F4EAD84E2AE708C5378E1152" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_7EC0C4DBDC5AFF496FC208C5378E08A3" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_7EC0C4DBDC5AFF496FC208C5378E08A3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_3D98594126B22A3C6B5408C5378FF6DB" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_3D98594126B22A3C6B5408C5378FF6DB" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LongTermDebtIncludingParValue" xlink:label="loc_onnn_LongTermDebtIncludingParValue_B66B1EAD2DB5B87C3E7D08C5378FC60A" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_onnn_LongTermDebtIncludingParValue_B66B1EAD2DB5B87C3E7D08C5378FC60A" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LongTermDebtAssumedRetirementOfPrincipal" xlink:label="loc_onnn_LongTermDebtAssumedRetirementOfPrincipal_920CBB95B128EB00F08B0932B84F495E" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_onnn_LongTermDebtAssumedRetirementOfPrincipal_920CBB95B128EB00F08B0932B84F495E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0DB45AE3466AAB300B7B0932B85E3B25" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_0A6E4761F9AD0DE101830932B840B6AA" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_0DB45AE3466AAB300B7B0932B85E3B25" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebtConversionAndRetirementOfDebtdetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_5B7F127B98EEDE7382EA08C5377EC9CD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_us-gaap_DebtInstrumentTable_5B7F127B98EEDE7382EA08C5377EC9CD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4FA5E4F1BE1EC9A49A3008C5377ED5AB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_5B7F127B98EEDE7382EA08C5377EC9CD" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4FA5E4F1BE1EC9A49A3008C5377ED5AB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_A8DBC3CC0C27F7F4B98708C5377EF86D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4FA5E4F1BE1EC9A49A3008C5377ED5AB" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_A8DBC3CC0C27F7F4B98708C5377EF86D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_A8DBC3CC0C27F7F4B98708C5377EF86D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4FA5E4F1BE1EC9A49A3008C5377ED5AB" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_A8DBC3CC0C27F7F4B98708C5377EF86D" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember" xlink:label="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_13CDB7817C553ACB8FCC08C53784A51D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_A8DBC3CC0C27F7F4B98708C5377EF86D" xlink:to="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_13CDB7817C553ACB8FCC08C53784A51D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_F5C28ECAE14E6F3A523508C537845357" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_us-gaap_LongTermDebt_F5C28ECAE14E6F3A523508C537845357" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_DB7FF85826A113C5769F08C53784D935" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_DB7FF85826A113C5769F08C53784D935" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentConvertibleConversionRatio" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionRatio_5B670F8CFAEF15F0FBAA08C537840404" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionRatio_5B670F8CFAEF15F0FBAA08C537840404" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtConversionOriginalDebtAmount1" xlink:label="loc_us-gaap_DebtConversionOriginalDebtAmount1_9260FE39A047B04F309708C53784E619" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_us-gaap_DebtConversionOriginalDebtAmount1_9260FE39A047B04F309708C53784E619" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ConsecutiveTradingDaysIncludedInCalculationOfConversionObligation" xlink:label="loc_onnn_ConsecutiveTradingDaysIncludedInCalculationOfConversionObligation_E15156376DF7BB3324D608C537843131" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_onnn_ConsecutiveTradingDaysIncludedInCalculationOfConversionObligation_E15156376DF7BB3324D608C537843131" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_DebtInstrumentConvertibleCashSettlement" xlink:label="loc_onnn_DebtInstrumentConvertibleCashSettlement_DC7A4F9E5576FBB6AFEF08C53784F140" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_onnn_DebtInstrumentConvertibleCashSettlement_DC7A4F9E5576FBB6AFEF08C53784F140" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature" xlink:label="loc_us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature_69A66FA092F2D8855E2608C537841B38" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3BA3B8945DF8646E1D6008C537848471" xlink:to="loc_us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature_69A66FA092F2D8855E2608C537841B38" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebtLongTermDebtDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_71A7B46096147B6E22C70DF7D6368DFC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_us-gaap_DebtInstrumentTable_71A7B46096147B6E22C70DF7D6368DFC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_815E30803847DC96B2DB0DF7D6367C78" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_71A7B46096147B6E22C70DF7D6368DFC" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_815E30803847DC96B2DB0DF7D6367C78" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_815E30803847DC96B2DB0DF7D6367C78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_815E30803847DC96B2DB0DF7D6367C78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SeniorRevolvingCreditFacilityMember" xlink:label="loc_onnn_SeniorRevolvingCreditFacilityMember_B38DD04E393F289F836B0DF7D63753FE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_SeniorRevolvingCreditFacilityMember_B38DD04E393F289F836B0DF7D63753FE" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoanWithJapaneseCompanyDueTwoThousandTwelveThroughTwoThousandEighteenInterestPayableQuarterlyAtTwoPointThreeThreePercentageMember" xlink:label="loc_onnn_LoanWithJapaneseCompanyDueTwoThousandTwelveThroughTwoThousandEighteenInterestPayableQuarterlyAtTwoPointThreeThreePercentageMember_DC95B6C302DAF5D482340DF7D637A225" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_LoanWithJapaneseCompanyDueTwoThousandTwelveThroughTwoThousandEighteenInterestPayableQuarterlyAtTwoPointThreeThreePercentageMember_DC95B6C302DAF5D482340DF7D637A225" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember" xlink:label="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_3654466A64D9D95BFF950DF7D637C363" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_3654466A64D9D95BFF950DF7D637C363" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember" xlink:label="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_B7211BC8018AE965CE100DF7D6372D31" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_B7211BC8018AE965CE100DF7D6372D31" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember" xlink:label="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_E609C04611430EC288730DF7D637F785" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_E609C04611430EC288730DF7D637F785" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoanWithHongKongBankInterestPayableWeeklyMember" xlink:label="loc_onnn_LoanWithHongKongBankInterestPayableWeeklyMember_1C191BDC8D4001CB38AD0DF7D637B2A9" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_LoanWithHongKongBankInterestPayableWeeklyMember_1C191BDC8D4001CB38AD0DF7D637B2A9" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoansWithPhilippineBanksDueTwoThousandTwelveThroughTwoThousandFifteenInterestPayableMonthlyAndQuarterlyAtAverageRateOfTwoPointZeroOneAndOnePointEightZeroMember" xlink:label="loc_onnn_LoansWithPhilippineBanksDueTwoThousandTwelveThroughTwoThousandFifteenInterestPayableMonthlyAndQuarterlyAtAverageRateOfTwoPointZeroOneAndOnePointEightZeroMember_A4F05A325E2F6385C88F0DF7D63779FE" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_LoansWithPhilippineBanksDueTwoThousandTwelveThroughTwoThousandFifteenInterestPayableMonthlyAndQuarterlyAtAverageRateOfTwoPointZeroOneAndOnePointEightZeroMember_A4F05A325E2F6385C88F0DF7D63779FE" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoansWithChineseBanksDueTwoThousandAndThirteenInterestPayableQuarterlyMember" xlink:label="loc_onnn_LoansWithChineseBanksDueTwoThousandAndThirteenInterestPayableQuarterlyMember_81B83B8C53B6054AB49C0DF7D6372AD9" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_LoansWithChineseBanksDueTwoThousandAndThirteenInterestPayableQuarterlyMember_81B83B8C53B6054AB49C0DF7D6372AD9" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoansWithJapaneseBanksDueThroughTwoThousandAndThirteenInterestPayableMonthlyAndSemiAnnuallyMember" xlink:label="loc_onnn_LoansWithJapaneseBanksDueThroughTwoThousandAndThirteenInterestPayableMonthlyAndSemiAnnuallyMember_00894F778196CF24D2A10DF7D6376A65" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_LoansWithJapaneseBanksDueThroughTwoThousandAndThirteenInterestPayableMonthlyAndSemiAnnuallyMember_00894F778196CF24D2A10DF7D6376A65" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoanWithSingaporeBankInterestPayableWeeklyMember" xlink:label="loc_onnn_LoanWithSingaporeBankInterestPayableWeeklyMember_BD36BA3E36E8357725DE0DF7D637D1E0" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_LoanWithSingaporeBankInterestPayableWeeklyMember_BD36BA3E36E8357725DE0DF7D637D1E0" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_LoanWithBritishFinanceCompanyInterestPayableMonthlyMember" xlink:label="loc_onnn_LoanWithBritishFinanceCompanyInterestPayableMonthlyMember_73B3C14282342784ABF50DF7D637902D" xlink:type="locator" />
    <definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_LoanWithBritishFinanceCompanyInterestPayableMonthlyMember_73B3C14282342784ABF50DF7D637902D" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_USRealEstateMortgagesPayableMonthlyThroughTwoThousandSixteenAtAverageRateOfFourPointEightSixPercentageMember" xlink:label="loc_onnn_USRealEstateMortgagesPayableMonthlyThroughTwoThousandSixteenAtAverageRateOfFourPointEightSixPercentageMember_93735E49D8ADEE4E043F0DF7D63760DF" xlink:type="locator" />
    <definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_USRealEstateMortgagesPayableMonthlyThroughTwoThousandSixteenAtAverageRateOfFourPointEightSixPercentageMember_93735E49D8ADEE4E043F0DF7D63760DF" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_USEquipmentFinancingPayableMonthlyThroughTwoThousandFifteenAtThreePointTwoThreePercentageMember" xlink:label="loc_onnn_USEquipmentFinancingPayableMonthlyThroughTwoThousandFifteenAtThreePointTwoThreePercentageMember_9E2914F4CF49557D526E0DF7D6388123" xlink:type="locator" />
    <definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_USEquipmentFinancingPayableMonthlyThroughTwoThousandFifteenAtThreePointTwoThreePercentageMember_9E2914F4CF49557D526E0DF7D6388123" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_CanadaEquipmentFinancingMember" xlink:label="loc_onnn_CanadaEquipmentFinancingMember_13017FF365F2F7CCB2920DF7D638D860" xlink:type="locator" />
    <definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_onnn_CanadaEquipmentFinancingMember_13017FF365F2F7CCB2920DF7D638D860" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CapitalLeaseObligationsMember" xlink:label="loc_us-gaap_CapitalLeaseObligationsMember_4337418997C5847302C20DF7D63834D4" xlink:type="locator" />
    <definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_DFB239FAFB91135C451A0DF7D636A043" xlink:to="loc_us-gaap_CapitalLeaseObligationsMember_4337418997C5847302C20DF7D63834D4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_083106C97CBDC69DBC340DF7D638B90E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_71A7B46096147B6E22C70DF7D6368DFC" xlink:to="loc_us-gaap_RangeAxis_083106C97CBDC69DBC340DF7D638B90E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_74B2F691E94A985F19680DF7D638E15A_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_083106C97CBDC69DBC340DF7D638B90E" xlink:to="loc_us-gaap_RangeMember_74B2F691E94A985F19680DF7D638E15A_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_74B2F691E94A985F19680DF7D638E15A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_083106C97CBDC69DBC340DF7D638B90E" xlink:to="loc_us-gaap_RangeMember_74B2F691E94A985F19680DF7D638E15A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_0585267381270E5ED6DF0DF7D638B399" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_74B2F691E94A985F19680DF7D638E15A" xlink:to="loc_us-gaap_MinimumMember_0585267381270E5ED6DF0DF7D638B399" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_D35DDB6E1D14E2DE71B10DF7D6386E11" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_74B2F691E94A985F19680DF7D638E15A" xlink:to="loc_us-gaap_MaximumMember_D35DDB6E1D14E2DE71B10DF7D6386E11" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_6B6D65BF577A93832CB60DF7D6388E60" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_us-gaap_LongTermDebt_6B6D65BF577A93832CB60DF7D6388E60" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_5BE30D82C091C34D825C0DF7D638B10D" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_us-gaap_LongTermDebtCurrent_5BE30D82C091C34D825C0DF7D638B10D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_BBD1A09BEB1B7A85EB940DF7D638A428" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_BBD1A09BEB1B7A85EB940DF7D638A428" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_53F9485E53ED3BC683A00DF7D638CCAB" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_53F9485E53ED3BC683A00DF7D638CCAB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscount" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_FEF350FA154076D999820DF7D6386D06" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_FEF350FA154076D999820DF7D6386D06" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_DebtInstrumentMaturityYear" xlink:label="loc_onnn_DebtInstrumentMaturityYear_3B89FD46DE8C6FDA36A80DF7D638AF4B" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_onnn_DebtInstrumentMaturityYear_3B89FD46DE8C6FDA36A80DF7D638AF4B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_24D454C590324C0ABF750DF7D638B50A" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_24D454C590324C0ABF750DF7D638B50A" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ConsecutiveTradingDaysIncludedInCalculationOfConversionObligation" xlink:label="loc_onnn_ConsecutiveTradingDaysIncludedInCalculationOfConversionObligation_8CCE0EB4C61C0F7131380DF7D6382101" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_93FFC29B845746D030D60DF7D6388CA7" xlink:to="loc_onnn_ConsecutiveTradingDaysIncludedInCalculationOfConversionObligation_8CCE0EB4C61C0F7131380DF7D6382101" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebtLossOnDebtExchangeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_3738519EE80874159DE408C5378A77D2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:to="loc_us-gaap_DebtInstrumentTable_3738519EE80874159DE408C5378A77D2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_F8D94235F3C6CF7B202408C5378A7A23" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3738519EE80874159DE408C5378A77D2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_F8D94235F3C6CF7B202408C5378A7A23" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5DBCA95CA5D5B8EBF5A708C5378A88AF_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_F8D94235F3C6CF7B202408C5378A7A23" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5DBCA95CA5D5B8EBF5A708C5378A88AF_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5DBCA95CA5D5B8EBF5A708C5378A88AF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_F8D94235F3C6CF7B202408C5378A7A23" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5DBCA95CA5D5B8EBF5A708C5378A88AF" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember" xlink:label="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_A9FE67074EB79D99CD1308C5378A3EC7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5DBCA95CA5D5B8EBF5A708C5378A88AF" xlink:to="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_A9FE67074EB79D99CD1308C5378A3EC7" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember" xlink:label="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_7BE51D8AB5526371BDA308C5378AD5BF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5DBCA95CA5D5B8EBF5A708C5378A88AF" xlink:to="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_7BE51D8AB5526371BDA308C5378AD5BF" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ExtinguishmentOfDebtGainLossNetOfTax" xlink:label="loc_us-gaap_ExtinguishmentOfDebtGainLossNetOfTax_6C03AF178793715E0E1A08C5378AA2E3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:to="loc_us-gaap_ExtinguishmentOfDebtGainLossNetOfTax_6C03AF178793715E0E1A08C5378AA2E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EE77EFC202259A8FD5950944BF4FB0A6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EE77EFC202259A8FD5950944BF4FB0A6" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ParValueOfDebtExchanged" xlink:label="loc_onnn_ParValueOfDebtExchanged_2969F1ABD65762F644F008C5378ACE2F" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:to="loc_onnn_ParValueOfDebtExchanged_2969F1ABD65762F644F008C5378ACE2F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_1DC7FA1A292D49FA1B2E08C5378AD818" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:to="loc_us-gaap_LongTermDebt_1DC7FA1A292D49FA1B2E08C5378AD818" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_2CDBB3A083FC6786C85108C5378AB17B" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_2CDBB3A083FC6786C85108C5378AB17B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_60BF9A02836484B6086808C5378ADD0D" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_B00CAC99ED8E8B240A9408C5378A48DE" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt_60BF9A02836484B6086808C5378ADD0D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebtNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_2A8FCD9768712C26BB9E08C5376641C3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_0A3D2B7B0EA90C96B66B08C53761B254" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2A8FCD9768712C26BB9E08C5376641C3" xlink:to="loc_us-gaap_DebtInstrumentTable_0A3D2B7B0EA90C96B66B08C53761B254" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_EAA82F0DD4F0259A234108C53766336E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_0A3D2B7B0EA90C96B66B08C53761B254" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_EAA82F0DD4F0259A234108C53766336E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5A9CD8EB139D01AC445B08C53766EC22_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_EAA82F0DD4F0259A234108C53766336E" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5A9CD8EB139D01AC445B08C53766EC22_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5A9CD8EB139D01AC445B08C53766EC22" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_EAA82F0DD4F0259A234108C53766336E" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5A9CD8EB139D01AC445B08C53766EC22" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember" xlink:label="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_FB901F0CDBBE59B4CECE08C537669EBA" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5A9CD8EB139D01AC445B08C53766EC22" xlink:to="loc_onnn_TwoPointSixTwoFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentySixMember_FB901F0CDBBE59B4CECE08C537669EBA" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember" xlink:label="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_B843F5ACB4908960A68708C537667D1C" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5A9CD8EB139D01AC445B08C53766EC22" xlink:to="loc_onnn_SeriesBTwoPointSixTwoFivePercentConvertibleSeniorSubordinatedNotesDueTwoZeroTwoSixMember_B843F5ACB4908960A68708C537667D1C" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember" xlink:label="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_10581CE6D38EF5B6363608C537660BF8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5A9CD8EB139D01AC445B08C53766EC22" xlink:to="loc_onnn_OnePointEightSevenFivePercentageConvertibleSeniorSubordinatedNotesDueTwoThousandTwentyFiveMember_10581CE6D38EF5B6363608C537660BF8" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ParValueOfDebtExchanged" xlink:label="loc_onnn_ParValueOfDebtExchanged_7E9A9BE0F778ED2376FE08C537664FC8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2A8FCD9768712C26BB9E08C5376641C3" xlink:to="loc_onnn_ParValueOfDebtExchanged_7E9A9BE0F778ED2376FE08C537664FC8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_B65BBE9B38D08476162808C537677602" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2A8FCD9768712C26BB9E08C5376641C3" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_B65BBE9B38D08476162808C537677602" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_A995BDBF6BF623EF3D4B08C53766352D" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_2A8FCD9768712C26BB9E08C5376641C3" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_A995BDBF6BF623EF3D4B08C53766352D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/LongTermDebtTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/RecentAccountingPronouncementsRecentAccountingPronouncements" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/RecentAccountingPronouncementsRecentAccountingPronouncementsPolicies" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNet" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E213BC59E057FC8F011A23BA330E761A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E213BC59E057FC8F011A23BA330E761A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_14DA8131F171C2C2379623BA330E66D1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E213BC59E057FC8F011A23BA330E761A" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_14DA8131F171C2C2379623BA330E66D1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_EF53A50755BC04AA5BB223BA330EF4D0_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_14DA8131F171C2C2379623BA330E66D1" xlink:to="loc_us-gaap_EquityComponentDomain_EF53A50755BC04AA5BB223BA330EF4D0_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_EF53A50755BC04AA5BB223BA330EF4D0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_14DA8131F171C2C2379623BA330E66D1" xlink:to="loc_us-gaap_EquityComponentDomain_EF53A50755BC04AA5BB223BA330EF4D0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_058AD052DF14FF7E595523BA330E9EF7" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_EF53A50755BC04AA5BB223BA330EF4D0" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_058AD052DF14FF7E595523BA330E9EF7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_EC0B2E57D0BFF4C36EF723BA330E3DFA" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E213BC59E057FC8F011A23BA330E761A" xlink:to="loc_us-gaap_RangeAxis_EC0B2E57D0BFF4C36EF723BA330E3DFA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_E0E8E263B5FE3BEB878923BA330EB9CD_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_EC0B2E57D0BFF4C36EF723BA330E3DFA" xlink:to="loc_us-gaap_RangeMember_E0E8E263B5FE3BEB878923BA330EB9CD_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_E0E8E263B5FE3BEB878923BA330EB9CD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_EC0B2E57D0BFF4C36EF723BA330E3DFA" xlink:to="loc_us-gaap_RangeMember_E0E8E263B5FE3BEB878923BA330EB9CD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_7B1E4C50E7E019E57BB623BA330E3537" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_E0E8E263B5FE3BEB878923BA330EB9CD" xlink:to="loc_us-gaap_MinimumMember_7B1E4C50E7E019E57BB623BA330E3537" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_D14D797D592F884EC2ED23BA330E7770" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_E0E8E263B5FE3BEB878923BA330EB9CD" xlink:to="loc_us-gaap_MaximumMember_D14D797D592F884EC2ED23BA330E7770" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_NotificationAxis" xlink:label="loc_onnn_NotificationAxis_9EB2366A456F9845179623BA330E56A2" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E213BC59E057FC8F011A23BA330E761A" xlink:to="loc_onnn_NotificationAxis_9EB2366A456F9845179623BA330E56A2" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_NotificationDomain" xlink:label="loc_onnn_NotificationDomain_35AE69A9A1E24B29E5F923BA330E73E4_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_onnn_NotificationAxis_9EB2366A456F9845179623BA330E56A2" xlink:to="loc_onnn_NotificationDomain_35AE69A9A1E24B29E5F923BA330E73E4_default" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_NotificationDomain" xlink:label="loc_onnn_NotificationDomain_35AE69A9A1E24B29E5F923BA330E73E4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_onnn_NotificationAxis_9EB2366A456F9845179623BA330E56A2" xlink:to="loc_onnn_NotificationDomain_35AE69A9A1E24B29E5F923BA330E73E4" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TotalEmployeesNotifiedMember" xlink:label="loc_onnn_TotalEmployeesNotifiedMember_29B74B3C6BE54BB5187823BA330E8DE3" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_NotificationDomain_35AE69A9A1E24B29E5F923BA330E73E4" xlink:to="loc_onnn_TotalEmployeesNotifiedMember_29B74B3C6BE54BB5187823BA330E8DE3" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesAndRelatedAcquisitionAxis" xlink:label="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_483DBDA31DEFCD7F381623BA330E25C3" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E213BC59E057FC8F011A23BA330E761A" xlink:to="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_483DBDA31DEFCD7F381623BA330E25C3" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesAndRelatedAcquisitionDomain" xlink:label="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_E865A951A34FFB0A28A123BA330EB014_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_483DBDA31DEFCD7F381623BA330E25C3" xlink:to="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_E865A951A34FFB0A28A123BA330EB014_default" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesAndRelatedAcquisitionDomain" xlink:label="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_E865A951A34FFB0A28A123BA330EB014" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_483DBDA31DEFCD7F381623BA330E25C3" xlink:to="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_E865A951A34FFB0A28A123BA330EB014" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember" xlink:label="loc_onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember_0348F8881E2083A05AA623BA330EC929" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_E865A951A34FFB0A28A123BA330EB014" xlink:to="loc_onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember_0348F8881E2083A05AA623BA330EC929" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenAizuClosureMember" xlink:label="loc_onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenAizuClosureMember_37B2FBF991E3DEFA4EA823BA330E1BEC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_E865A951A34FFB0A28A123BA330EB014" xlink:to="loc_onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenAizuClosureMember_37B2FBF991E3DEFA4EA823BA330E1BEC" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_21DD4360AD9CA54A3E5523BA330EFFCB" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E213BC59E057FC8F011A23BA330E761A" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_21DD4360AD9CA54A3E5523BA330EFFCB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_0CEAE26C750CBC55184B23BA330EBC69_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_21DD4360AD9CA54A3E5523BA330EFFCB" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_0CEAE26C750CBC55184B23BA330EBC69_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_0CEAE26C750CBC55184B23BA330EBC69" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_21DD4360AD9CA54A3E5523BA330EFFCB" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_0CEAE26C750CBC55184B23BA330EBC69" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AccruedEmployeeSeparationCostsMember" xlink:label="loc_onnn_AccruedEmployeeSeparationCostsMember_94AC4C17A0DC19BB5E8023BA330E2220" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_0CEAE26C750CBC55184B23BA330EBC69" xlink:to="loc_onnn_AccruedEmployeeSeparationCostsMember_94AC4C17A0DC19BB5E8023BA330E2220" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_EstimatedCostsToExitMember" xlink:label="loc_onnn_EstimatedCostsToExitMember_8653D851AD654BE7F26F23BA330E8697" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_0CEAE26C750CBC55184B23BA330EBC69" xlink:to="loc_onnn_EstimatedCostsToExitMember_8653D851AD654BE7F26F23BA330E8697" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated_47BDFBFDAEEE0C3C725723BA330E29B2" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated_47BDFBFDAEEE0C3C725723BA330E29B2" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated" xlink:label="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_37BDCD4BCC52CC89306823BA330EE1E0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated_37BDCD4BCC52CC89306823BA330EE1E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherRestructuringCosts" xlink:label="loc_us-gaap_OtherRestructuringCosts_CA3E9A4C62ED9B53ACC623BA330E57C6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_us-gaap_OtherRestructuringCosts_CA3E9A4C62ED9B53ACC623BA330E57C6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_9360410E49205A0E4DB223BA330E9789" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_us-gaap_RestructuringReserve_9360410E49205A0E4DB223BA330E9789" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringAndRelatedCostExpectedCost" xlink:label="loc_us-gaap_RestructuringAndRelatedCostExpectedCost_FF1E3397DCA8F5B14ED823BA330E3E32" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_us-gaap_RestructuringAndRelatedCostExpectedCost_FF1E3397DCA8F5B14ED823BA330E3E32" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringAndRelatedCostExpectedPensionCurtailmentGain" xlink:label="loc_onnn_RestructuringAndRelatedCostExpectedPensionCurtailmentGain_95B52F935812830E05D323BA330E730E" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_onnn_RestructuringAndRelatedCostExpectedPensionCurtailmentGain_95B52F935812830E05D323BA330E730E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_39A80ADBA4C042F8296C23BA330E53D2" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_us-gaap_RestructuringCharges_39A80ADBA4C042F8296C23BA330E53D2" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax" xlink:label="loc_onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_CAF0C6C91B95E039C8E123BA330EF523" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_89B7105B8C4DD913BC0F23BA330E413E" xlink:to="loc_onnn_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_CAF0C6C91B95E039C8E123BA330EF523" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetReconciliationOfRestructuringAssetImpairmentsAndOtherNetCaptionOnConsolidatedStatementOfOperationsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_F10F4FE38DE5D3F44F7E04B96A6CAAC3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E135C69EB17B669B83104B96A6C2094" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_F10F4FE38DE5D3F44F7E04B96A6CAAC3" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E135C69EB17B669B83104B96A6C2094" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesAndRelatedAcquisitionAxis" xlink:label="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_7537AFD7469A33F8844204B96A6C4BB4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_5E135C69EB17B669B83104B96A6C2094" xlink:to="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_7537AFD7469A33F8844204B96A6C4BB4" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesAndRelatedAcquisitionDomain" xlink:label="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_7537AFD7469A33F8844204B96A6C4BB4" xlink:to="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57_default" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesAndRelatedAcquisitionDomain" xlink:label="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionAxis_7537AFD7469A33F8844204B96A6C4BB4" xlink:to="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember" xlink:label="loc_onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember_49DD22BDBF28E5D8BBB804B96A6CAE90" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57" xlink:to="loc_onnn_RestructuringActivitiesRelatedToVoluntaryRetirementProgramAtSanyoSemiconductorMember_49DD22BDBF28E5D8BBB804B96A6CAE90" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenAizuClosureMember" xlink:label="loc_onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenAizuClosureMember_BF6744AA2E89B4BEA85704B96A6C4B6E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57" xlink:to="loc_onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenAizuClosureMember_BF6744AA2E89B4BEA85704B96A6C4B6E" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenGlobalWorkforceReductionMember" xlink:label="loc_onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenGlobalWorkforceReductionMember_4220F8495902193D681504B96A6C6129" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57" xlink:to="loc_onnn_RestructuringActivitiesRelatedToTwoThousandAndElevenGlobalWorkforceReductionMember_4220F8495902193D681504B96A6C6129" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_RestructuringActivitiesAndRelatedAcquisitionMember" xlink:label="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionMember_E0110F83D7666DE1AFFA04B96A6CE375" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionDomain_D4C382AFD383FDA4DA7A04B96A6C0E57" xlink:to="loc_onnn_RestructuringActivitiesAndRelatedAcquisitionMember_E0110F83D7666DE1AFFA04B96A6CE375" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCosts" xlink:label="loc_us-gaap_RestructuringCosts_1E11A0DB2DEE4238B92304B96A6C3B20" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_F10F4FE38DE5D3F44F7E04B96A6CAAC3" xlink:to="loc_us-gaap_RestructuringCosts_1E11A0DB2DEE4238B92304B96A6C3B20" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AssetImpairmentCharges" xlink:label="loc_us-gaap_AssetImpairmentCharges_5BF985B985387E4015B904B96A6C88E0" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_F10F4FE38DE5D3F44F7E04B96A6CAAC3" xlink:to="loc_us-gaap_AssetImpairmentCharges_5BF985B985387E4015B904B96A6C88E0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OtherRestructuringCosts" xlink:label="loc_us-gaap_OtherRestructuringCosts_23DB314F437AE6F0F89804B96A6CA777" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_F10F4FE38DE5D3F44F7E04B96A6CAAC3" xlink:to="loc_us-gaap_OtherRestructuringCosts_23DB314F437AE6F0F89804B96A6CA777" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_7CE936E5F93843949FAD04B96A6CDA2D" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_F10F4FE38DE5D3F44F7E04B96A6CAAC3" xlink:to="loc_us-gaap_RestructuringCharges_7CE936E5F93843949FAD04B96A6CDA2D" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetRollforwardOfAccruedRestructuringChargesDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_F686DAE7F21134A2120904B96A6C76EF" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_BA7863633BEF6F141B9304B96A6CEA9F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_F686DAE7F21134A2120904B96A6C76EF" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_BA7863633BEF6F141B9304B96A6CEA9F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_4475B8FBC3D13077DF3F04B96A6CA245" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_BA7863633BEF6F141B9304B96A6CEA9F" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_4475B8FBC3D13077DF3F04B96A6CA245" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_751B4BC70F21F22629E004B96A6CBB86_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_4475B8FBC3D13077DF3F04B96A6CA245" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_751B4BC70F21F22629E004B96A6CBB86_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_751B4BC70F21F22629E004B96A6CBB86" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_4475B8FBC3D13077DF3F04B96A6CA245" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_751B4BC70F21F22629E004B96A6CBB86" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_EstimatedEmployeeSeparationCostsMember" xlink:label="loc_onnn_EstimatedEmployeeSeparationCostsMember_D88AE501B5F1C97934E904B96A6CD6EC" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_751B4BC70F21F22629E004B96A6CBB86" xlink:to="loc_onnn_EstimatedEmployeeSeparationCostsMember_D88AE501B5F1C97934E904B96A6CD6EC" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_EstimatedCostsToExitMember" xlink:label="loc_onnn_EstimatedCostsToExitMember_5F9E60252F222738D50C04B96A6C17A6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_751B4BC70F21F22629E004B96A6CBB86" xlink:to="loc_onnn_EstimatedCostsToExitMember_5F9E60252F222738D50C04B96A6C17A6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="loc_us-gaap_RestructuringReserveRollForward_658A708EFDAC01DA165D04B96A6CFA12" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_F686DAE7F21134A2120904B96A6C76EF" xlink:to="loc_us-gaap_RestructuringReserveRollForward_658A708EFDAC01DA165D04B96A6CFA12" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_4460D3FFB3B23234719704B96A6C796A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_658A708EFDAC01DA165D04B96A6CFA12" xlink:to="loc_us-gaap_RestructuringReserve_4460D3FFB3B23234719704B96A6C796A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_5939035E240F1A5E3B4D04B96A6C0189" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_658A708EFDAC01DA165D04B96A6CFA12" xlink:to="loc_us-gaap_RestructuringCharges_5939035E240F1A5E3B4D04B96A6C0189" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringReserveSettledWithCash" xlink:label="loc_us-gaap_RestructuringReserveSettledWithCash_30C73E37C25E075FE1B504B96A6C0878" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_658A708EFDAC01DA165D04B96A6CFA12" xlink:to="loc_us-gaap_RestructuringReserveSettledWithCash_30C73E37C25E075FE1B504B96A6C0878" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/RestructuringAssetImpairmentsAndOtherNetTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/SegmentInformation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/SegmentInformationNarrativeDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/SegmentInformationReconciliationsOfSegmentGrossProfitAndSegmentOperatingIncomeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_64862AA5F8A267B642C90DF7D56DFF0A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_64862AA5F8A267B642C90DF7D56DFF0A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_81DDC4A6F924585B95510DF7D56D4511" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_64862AA5F8A267B642C90DF7D56DFF0A" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_81DDC4A6F924585B95510DF7D56D4511" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_B42F795EED9F7027BDDC0DF7D56D5A2B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_81DDC4A6F924585B95510DF7D56D4511" xlink:to="loc_us-gaap_SegmentDomain_B42F795EED9F7027BDDC0DF7D56D5A2B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_B42F795EED9F7027BDDC0DF7D56D5A2B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_81DDC4A6F924585B95510DF7D56D4511" xlink:to="loc_us-gaap_SegmentDomain_B42F795EED9F7027BDDC0DF7D56D5A2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ReportableSegmentsMember" xlink:label="loc_us-gaap_ReportableSegmentsMember_E2724823ECC7107E5F3B0DF7D56D9AE5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_B42F795EED9F7027BDDC0DF7D56D5A2B" xlink:to="loc_us-gaap_ReportableSegmentsMember_E2724823ECC7107E5F3B0DF7D56D9AE5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_UnallocatedAmountToSegmentMember" xlink:label="loc_us-gaap_UnallocatedAmountToSegmentMember_F370E6D432624289251D0DF7D56D5AB7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_B42F795EED9F7027BDDC0DF7D56D5A2B" xlink:to="loc_us-gaap_UnallocatedAmountToSegmentMember_F370E6D432624289251D0DF7D56D5AB7" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SegmentReportingInformationGrossProfit" xlink:label="loc_onnn_SegmentReportingInformationGrossProfit_917EFCD1FAC938491FA60DF7D56D5299" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_onnn_SegmentReportingInformationGrossProfit_917EFCD1FAC938491FA60DF7D56D5299" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ManufacturingCosts" xlink:label="loc_us-gaap_ManufacturingCosts_19DAE62299946F3DD5850DF7D56D37B7" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_us-gaap_ManufacturingCosts_19DAE62299946F3DD5850DF7D56D37B7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GrossProfit" xlink:label="loc_us-gaap_GrossProfit_B3B5B813752F4478B0FA0DF7D56DFB27" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_us-gaap_GrossProfit_B3B5B813752F4478B0FA0DF7D56DFB27" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SegmentReportingInformationOperatingLossIncome" xlink:label="loc_onnn_SegmentReportingInformationOperatingLossIncome_6D17282F13040BA4F6070DF7D56D7DED" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_onnn_SegmentReportingInformationOperatingLossIncome_6D17282F13040BA4F6070DF7D56D7DED" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestructuringSettlementAndImpairmentProvisions" xlink:label="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_EE7A7E8D599A5B02B1030DF7D56D55DE" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_us-gaap_RestructuringSettlementAndImpairmentProvisions_EE7A7E8D599A5B02B1030DF7D56D55DE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_22964876BAC581049FB60DF7D56EC8BE" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_us-gaap_OperatingExpenses_22964876BAC581049FB60DF7D56EC8BE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_D2AAEF69727AAC0040F90DF7D56ED840" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_C536269E641C2E6FDDD60DF7D56D5113" xlink:to="loc_us-gaap_OperatingIncomeLoss_D2AAEF69727AAC0040F90DF7D56ED840" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/SegmentInformationRevenuesByGeographicLocationIncludingLocalSalesAndExportsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_D0D3979BF2B6FA10F9E62FF8EAA93BDA" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_03807980D34E342FCE2E2FF8EAA93F5D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_D0D3979BF2B6FA10F9E62FF8EAA93BDA" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_03807980D34E342FCE2E2FF8EAA93F5D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_9F70680F8E81D648E8D72FF8EAA9BEC4" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_03807980D34E342FCE2E2FF8EAA93F5D" xlink:to="loc_us-gaap_StatementGeographicalAxis_9F70680F8E81D648E8D72FF8EAA9BEC4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_9F70680F8E81D648E8D72FF8EAA9BEC4" xlink:to="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_9F70680F8E81D648E8D72FF8EAA9BEC4" xlink:to="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AmericasMember" xlink:label="loc_onnn_AmericasMember_6A47884F5DA022A7F8C62FF8EAA96D4C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:to="loc_onnn_AmericasMember_6A47884F5DA022A7F8C62FF8EAA96D4C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd#country_JP" xlink:label="loc_country_JP_4687B1407B7C3AE0AD922FF8EAA91AD6" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:to="loc_country_JP_4687B1407B7C3AE0AD922FF8EAA91AD6" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd#country_CN" xlink:label="loc_country_CN_0E38A1C1D5452A5AB2802FF8EAA98B49" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:to="loc_country_CN_0E38A1C1D5452A5AB2802FF8EAA98B49" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd#country_SG" xlink:label="loc_country_SG_C6BBB7DBD40D8F5CBC282FF8EAA92F38" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:to="loc_country_SG_C6BBB7DBD40D8F5CBC282FF8EAA92F38" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_EuropeMember" xlink:label="loc_onnn_EuropeMember_921A900B18050DB9C7242FF8EAA92726" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:to="loc_onnn_EuropeMember_921A900B18050DB9C7242FF8EAA92726" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherAsiaAndPacificMember" xlink:label="loc_onnn_OtherAsiaAndPacificMember_C2CB42334FD333CE86502FF8EAA93F92" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_82AAB12DF50A8E49A9712FF8EAA97F43" xlink:to="loc_onnn_OtherAsiaAndPacificMember_C2CB42334FD333CE86502FF8EAA93F92" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_8B1145AED491797D97D12FF8EAA9A164" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_D0D3979BF2B6FA10F9E62FF8EAA93BDA" xlink:to="loc_us-gaap_Revenues_8B1145AED491797D97D12FF8EAA9A164" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/SegmentInformationSegmentInformationOfRevenuesGrossProfitAndOperatingIncomeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_DD48080372D14884BB43F77846DE55B8" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2AAA8E0F61FDA64658D5F77846DD4B06" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_DD48080372D14884BB43F77846DE55B8" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2AAA8E0F61FDA64658D5F77846DD4B06" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_0E89461EA57328D8FB30F77846DDE939" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_2AAA8E0F61FDA64658D5F77846DD4B06" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_0E89461EA57328D8FB30F77846DDE939" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_77F36A3F3611BB302F09F77846DD84E8_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0E89461EA57328D8FB30F77846DDE939" xlink:to="loc_us-gaap_SegmentDomain_77F36A3F3611BB302F09F77846DD84E8_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_77F36A3F3611BB302F09F77846DD84E8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0E89461EA57328D8FB30F77846DDE939" xlink:to="loc_us-gaap_SegmentDomain_77F36A3F3611BB302F09F77846DD84E8" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ComputingAndConsumerGroupMember" xlink:label="loc_onnn_ComputingAndConsumerGroupMember_544FD058A249C53F66CEF77846DD6AFB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_77F36A3F3611BB302F09F77846DD84E8" xlink:to="loc_onnn_ComputingAndConsumerGroupMember_544FD058A249C53F66CEF77846DD6AFB" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_StandardProductsGroupMember" xlink:label="loc_onnn_StandardProductsGroupMember_12E114D17877059FE215F77846DDC421" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_77F36A3F3611BB302F09F77846DD84E8" xlink:to="loc_onnn_StandardProductsGroupMember_12E114D17877059FE215F77846DDC421" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SanyoSemiconductorProductsGroupMember" xlink:label="loc_onnn_SanyoSemiconductorProductsGroupMember_F0C286D7AB3C251DABE1F77846DE78F8" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_77F36A3F3611BB302F09F77846DD84E8" xlink:to="loc_onnn_SanyoSemiconductorProductsGroupMember_F0C286D7AB3C251DABE1F77846DE78F8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_F51178663745CEC130E8F77846DE186E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DD48080372D14884BB43F77846DE55B8" xlink:to="loc_us-gaap_Revenues_F51178663745CEC130E8F77846DE186E" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SegmentReportingInformationGrossProfit" xlink:label="loc_onnn_SegmentReportingInformationGrossProfit_3866375FCDF9C570F639F77846DEB7FC" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DD48080372D14884BB43F77846DE55B8" xlink:to="loc_onnn_SegmentReportingInformationGrossProfit_3866375FCDF9C570F639F77846DEB7FC" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_SegmentReportingInformationOperatingLossIncome" xlink:label="loc_onnn_SegmentReportingInformationOperatingLossIncome_F9F6BA5C8017DF843F2BF77846DE61EA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_DD48080372D14884BB43F77846DE55B8" xlink:to="loc_onnn_SegmentReportingInformationOperatingLossIncome_F9F6BA5C8017DF843F2BF77846DE61EA" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/SegmentInformationSummaryOfPropertyPlantAndEquipmentByGeographicLocationDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_4560D9F0C783D8FF7453307BECECAB3C" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E0C4E138F4DFB842C953307BECE2C3AF" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4560D9F0C783D8FF7453307BECECAB3C" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E0C4E138F4DFB842C953307BECE2C3AF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementGeographicalAxis" xlink:label="loc_us-gaap_StatementGeographicalAxis_93AA2B73094542EF00A9307BECE2FA52" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_E0C4E138F4DFB842C953307BECE2C3AF" xlink:to="loc_us-gaap_StatementGeographicalAxis_93AA2B73094542EF00A9307BECE2FA52" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementGeographicalAxis_93AA2B73094542EF00A9307BECE2FA52" xlink:to="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SegmentGeographicalDomain" xlink:label="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementGeographicalAxis_93AA2B73094542EF00A9307BECE2FA52" xlink:to="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AmericasMember" xlink:label="loc_onnn_AmericasMember_98118127EC111F5211B8307BECE29D64" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:to="loc_onnn_AmericasMember_98118127EC111F5211B8307BECE29D64" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd#country_JP" xlink:label="loc_country_JP_35C7AF7764663547B220307BECE201DF" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:to="loc_country_JP_35C7AF7764663547B220307BECE201DF" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_EuropeMember" xlink:label="loc_onnn_EuropeMember_01DD245BC90F81AB8F55307BECE2B557" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:to="loc_onnn_EuropeMember_01DD245BC90F81AB8F55307BECE2B557" xlink:type="arc" />
    <loc xlink:href="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd#country_MY" xlink:label="loc_country_MY_DC40F08C316DFC79833E307BECE23FB1" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:to="loc_country_MY_DC40F08C316DFC79833E307BECE23FB1" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_PhilippinesMember" xlink:label="loc_onnn_PhilippinesMember_CEFDB8E15C237F184A82307BECECE7B5" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:to="loc_onnn_PhilippinesMember_CEFDB8E15C237F184A82307BECECE7B5" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OtherAmericasMember" xlink:label="loc_onnn_OtherAmericasMember_CDD28E66A0A65E523C8E307BECECC9A7" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentGeographicalDomain_62F4BAA4C9000886D64B307BECE2AE61" xlink:to="loc_onnn_OtherAmericasMember_CDD28E66A0A65E523C8E307BECECC9A7" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_3346BE99E88A24AE7650307BECECFDD0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4560D9F0C783D8FF7453307BECECAB3C" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_3346BE99E88A24AE7650307BECECFDD0" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/SegmentInformationTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationAdditionalInformationOnStockOptionsOutstandingDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_5534EAB5606F08029BBF0CD802079C56" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_5534EAB5606F08029BBF0CD802079C56" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_8EB1940ACCEF794903080CD8020895A8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_5534EAB5606F08029BBF0CD802079C56" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_8EB1940ACCEF794903080CD8020895A8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_BB21E7C011BF3BD0D4490CD80208ED84_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_8EB1940ACCEF794903080CD8020895A8" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_BB21E7C011BF3BD0D4490CD80208ED84_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_BB21E7C011BF3BD0D4490CD80208ED84" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis_8EB1940ACCEF794903080CD8020895A8" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_BB21E7C011BF3BD0D4490CD80208ED84" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember" xlink:label="loc_onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember_094FDEA7C2465AD627860CD802085E1E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_BB21E7C011BF3BD0D4490CD80208ED84" xlink:to="loc_onnn_OptionPriceLessThanClosingPriceOfCommonStockAtEndOfQuarterMember_094FDEA7C2465AD627860CD802085E1E" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember" xlink:label="loc_onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember_346283E8C883400170060CD802088764" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_BB21E7C011BF3BD0D4490CD80208ED84" xlink:to="loc_onnn_OptionPriceAboveClosingPriceOfCommonStockAtEndOfQuarterMember_346283E8C883400170060CD802088764" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_TotalOutstandingMember" xlink:label="loc_onnn_TotalOutstandingMember_E398F7A8DE3568C568950CD802089056" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain_BB21E7C011BF3BD0D4490CD80208ED84" xlink:to="loc_onnn_TotalOutstandingMember_E398F7A8DE3568C568950CD802089056" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ClosingPriceOfCompanyStock" xlink:label="loc_onnn_ClosingPriceOfCompanyStock_CCE4430E86A3D8EFC5510CD802087D59" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_onnn_ClosingPriceOfCompanyStock_CCE4430E86A3D8EFC5510CD802087D59" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_0D233EC426EBAA44E95E0CD802080D54" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions_0D233EC426EBAA44E95E0CD802080D54" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_4AB568CA189657AB27020CD802085D7E" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1_4AB568CA189657AB27020CD802085D7E" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfSharesExercisableAndOutstanding" xlink:label="loc_onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfSharesExercisableAndOutstanding_258AD62B5F438F1839310CD802089E4A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfSharesExercisableAndOutstanding_258AD62B5F438F1839310CD802089E4A" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableAndOutstandingOptionsWeightedAverageExercisePrice" xlink:label="loc_onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableAndOutstandingOptionsWeightedAverageExercisePrice_D916F8A9D2519BF0672E0CD802082E86" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_onnn_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableAndOutstandingOptionsWeightedAverageExercisePrice_D916F8A9D2519BF0672E0CD802082E86" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_A25D365BCCC4BBBB9E460CD8020877B8" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions_A25D365BCCC4BBBB9E460CD8020877B8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_2BF4125036CC8F70E0CA0CD802089678" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_8FAE6982DBF9FA102B2B0CD8020849B3" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1_2BF4125036CC8F70E0CA0CD802089678" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA99D5B0775B70EAB7250D3C3F87F702" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA99D5B0775B70EAB7250D3C3F87F702" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis_80B46BE6E357687862880D3C3F87B1F0" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA99D5B0775B70EAB7250D3C3F87F702" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis_80B46BE6E357687862880D3C3F87B1F0" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_77B9EC51631CEC2F65950D3C3F88B10F_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis_80B46BE6E357687862880D3C3F87B1F0" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_77B9EC51631CEC2F65950D3C3F88B10F_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_TitleOfIndividualWithRelationshipToEntityDomain" xlink:label="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_77B9EC51631CEC2F65950D3C3F88B10F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTitleOfIndividualAxis_80B46BE6E357687862880D3C3F87B1F0" xlink:to="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_77B9EC51631CEC2F65950D3C3F88B10F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DirectorMember" xlink:label="loc_us-gaap_DirectorMember_CBAE0ABA092FD632C8970D3C3F88BC1C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TitleOfIndividualWithRelationshipToEntityDomain_77B9EC51631CEC2F65950D3C3F88B10F" xlink:to="loc_us-gaap_DirectorMember_CBAE0ABA092FD632C8970D3C3F88BC1C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PlanNameAxis" xlink:label="loc_us-gaap_PlanNameAxis_8D24D2529B12EFB24DAD0D3C3F881B35" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA99D5B0775B70EAB7250D3C3F87F702" xlink:to="loc_us-gaap_PlanNameAxis_8D24D2529B12EFB24DAD0D3C3F881B35" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_CA7DEDF1A7491F5DF1950D3C3F883F60_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_8D24D2529B12EFB24DAD0D3C3F881B35" xlink:to="loc_us-gaap_PlanNameDomain_CA7DEDF1A7491F5DF1950D3C3F883F60_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PlanNameDomain" xlink:label="loc_us-gaap_PlanNameDomain_CA7DEDF1A7491F5DF1950D3C3F883F60" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_8D24D2529B12EFB24DAD0D3C3F881B35" xlink:to="loc_us-gaap_PlanNameDomain_CA7DEDF1A7491F5DF1950D3C3F883F60" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_AmendedAndRestatedStockIncentivePlanMember" xlink:label="loc_onnn_AmendedAndRestatedStockIncentivePlanMember_78BC5DC5873E54180E9B0D3C3F894E0E" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_CA7DEDF1A7491F5DF1950D3C3F883F60" xlink:to="loc_onnn_AmendedAndRestatedStockIncentivePlanMember_78BC5DC5873E54180E9B0D3C3F894E0E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_3942ED33483A2BDBA93E0D3C3F89A657" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_CA7DEDF1A7491F5DF1950D3C3F883F60" xlink:to="loc_us-gaap_EmployeeStockMember_3942ED33483A2BDBA93E0D3C3F89A657" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_9A8D7874BEF80053D9230D3C3F894D2B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA99D5B0775B70EAB7250D3C3F87F702" xlink:to="loc_us-gaap_AwardTypeAxis_9A8D7874BEF80053D9230D3C3F894D2B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9A8D7874BEF80053D9230D3C3F894D2B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9A8D7874BEF80053D9230D3C3F894D2B" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_2197A4922B60DCB5E0550D3C3F898A8F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B" xlink:to="loc_us-gaap_EmployeeStockOptionMember_2197A4922B60DCB5E0550D3C3F898A8F" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_8C056CB8BC4D73D232880D3C3F893393" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_8C056CB8BC4D73D232880D3C3F893393" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StockOptionsMember" xlink:label="loc_us-gaap_StockOptionsMember_B86975C89A68BB198F780D3C3F891637" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B" xlink:to="loc_us-gaap_StockOptionsMember_B86975C89A68BB198F780D3C3F891637" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_7B93D828619F2D9CEEEB0D3C3F898A7A" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_556BAD05264F7200D5F90D3C3F89A90B" xlink:to="loc_us-gaap_EmployeeStockMember_7B93D828619F2D9CEEEB0D3C3F898A7A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_5BAFA03AA902123C6CF60D3C3F89AC10" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AA99D5B0775B70EAB7250D3C3F87F702" xlink:to="loc_us-gaap_RangeAxis_5BAFA03AA902123C6CF60D3C3F89AC10" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_B5950DC714161305B8230D3C3F89377D_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_5BAFA03AA902123C6CF60D3C3F89AC10" xlink:to="loc_us-gaap_RangeMember_B5950DC714161305B8230D3C3F89377D_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_B5950DC714161305B8230D3C3F89377D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_5BAFA03AA902123C6CF60D3C3F89AC10" xlink:to="loc_us-gaap_RangeMember_B5950DC714161305B8230D3C3F89377D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_A4D0A0EF855813AA78710D3C3F8A3AF1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_B5950DC714161305B8230D3C3F89377D" xlink:to="loc_us-gaap_MaximumMember_A4D0A0EF855813AA78710D3C3F8A3AF1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_1E6019C3A83E9B6B01A30D3C3F8A4939" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_B5950DC714161305B8230D3C3F89377D" xlink:to="loc_us-gaap_MinimumMember_1E6019C3A83E9B6B01A30D3C3F8A4939" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_E17863C2A5BED0C1F79C0D3C3F8AC937" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_E17863C2A5BED0C1F79C0D3C3F8AC937" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_A74AA66E3E3F3DF701870D3C3F8A3325" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_A74AA66E3E3F3DF701870D3C3F8A3325" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromStockOptionsExercised" xlink:label="loc_us-gaap_ProceedsFromStockOptionsExercised_25D99F130EEA8EC5831C0D3C3F8A51C6" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ProceedsFromStockOptionsExercised_25D99F130EEA8EC5831C0D3C3F8A51C6" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPreVestingForfeituresEstimated" xlink:label="loc_onnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPreVestingForfeituresEstimated_5AE8B91E7F00481E97D30D3C3F8A5422" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_onnn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPreVestingForfeituresEstimated_5AE8B91E7F00481E97D30D3C3F8A5422" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_9E349B93071CA978093E0D3C3F8B3917" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_9E349B93071CA978093E0D3C3F8B3917" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_772DFDA059A95704EA8D0D3C3F8BA8E3" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized_772DFDA059A95704EA8D0D3C3F8BA8E3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharePrice" xlink:label="loc_us-gaap_SharePrice_65FBB867AE80560634920D3C3F8BBFE4" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_SharePrice_65FBB867AE80560634920D3C3F8BBFE4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5BD6A4E82F999EF920480D3C3F8B356C" xlink:type="locator" />
    <definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_5BD6A4E82F999EF920480D3C3F8B356C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B204445E673B23CC87850D3C3F8B3B87" xlink:type="locator" />
    <definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B204445E673B23CC87850D3C3F8B3B87" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FFCE11E2F2CA33C96070D3C3F8B28FD" xlink:type="locator" />
    <definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F603990D84C3D64537760D3C3F8ADD5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_2FFCE11E2F2CA33C96070D3C3F8B28FD" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationSummaryOfRestrictedStockUnitsTransactionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8F1BC46ACEF10859A8540CD80202CA4F" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8D359711E0121D4899C60CD80202EEB5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8F1BC46ACEF10859A8540CD80202CA4F" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8D359711E0121D4899C60CD80202EEB5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_7206055B35AF3ECD6DB90CD802023E2C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8D359711E0121D4899C60CD80202EEB5" xlink:to="loc_us-gaap_AwardTypeAxis_7206055B35AF3ECD6DB90CD802023E2C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A97ACD07E5F05DA4CBEA0CD80202B534_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_7206055B35AF3ECD6DB90CD802023E2C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A97ACD07E5F05DA4CBEA0CD80202B534_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A97ACD07E5F05DA4CBEA0CD80202B534" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_7206055B35AF3ECD6DB90CD802023E2C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A97ACD07E5F05DA4CBEA0CD80202B534" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_A29A9816084218621DCF0CD80202F2FE" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_A97ACD07E5F05DA4CBEA0CD80202B534" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_A29A9816084218621DCF0CD80202F2FE" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_E554B55D62D7C5D5287F0CEAF10E39BD" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8F1BC46ACEF10859A8540CD80202CA4F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_E554B55D62D7C5D5287F0CEAF10E39BD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BD3905F290A88012BE760CD80202E25C" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_E554B55D62D7C5D5287F0CEAF10E39BD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_BD3905F290A88012BE760CD80202E25C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_575C1DAD21348D1E786E0CD80202FB54" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_E554B55D62D7C5D5287F0CEAF10E39BD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_575C1DAD21348D1E786E0CD80202FB54" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_36C6DDC336195800750F0CD802028D39" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_E554B55D62D7C5D5287F0CEAF10E39BD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_36C6DDC336195800750F0CD802028D39" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_E96FDF524812A07682F30CD802036760" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_E554B55D62D7C5D5287F0CEAF10E39BD" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_E96FDF524812A07682F30CD802036760" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_B67BF9256874B5F9B4220CEC60E4E1E4" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_8F1BC46ACEF10859A8540CD80202CA4F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_B67BF9256874B5F9B4220CEC60E4E1E4" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_774BB33C91D533A214E70CD802032815" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_B67BF9256874B5F9B4220CEC60E4E1E4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_774BB33C91D533A214E70CD802032815" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_0DF774F5B2B6FF0A0CA00CD8020344E5" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_B67BF9256874B5F9B4220CEC60E4E1E4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_0DF774F5B2B6FF0A0CA00CD8020344E5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0801ECFA44416136BB080CD80203DFCD" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_B67BF9256874B5F9B4220CEC60E4E1E4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0801ECFA44416136BB080CD80203DFCD" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_ADC2F1794C74B8D7F8510CD802030A07" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_B67BF9256874B5F9B4220CEC60E4E1E4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_ADC2F1794C74B8D7F8510CD802030A07" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationSummaryOfShareBasedCompensationExpenseDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2073876C70931A77EA150C728990B2DF" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A95D163E278E60C812C30C7289900E40" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2073876C70931A77EA150C728990B2DF" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A95D163E278E60C812C30C7289900E40" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_08086ABA5536825578640C728990A481" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_A95D163E278E60C812C30C7289900E40" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_08086ABA5536825578640C728990A481" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_08086ABA5536825578640C728990A481" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsByReportLineAxis_08086ABA5536825578640C728990A481" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CostOfSalesMember" xlink:label="loc_us-gaap_CostOfSalesMember_1BB9C2666E828B455E890C728990983D" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140" xlink:to="loc_us-gaap_CostOfSalesMember_1BB9C2666E828B455E890C728990983D" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_06A2EDF27ABD8830CFAA0C728990E823" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_06A2EDF27ABD8830CFAA0C728990E823" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_3E873F5B5F448C0E917F0C728990140B" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_3E873F5B5F448C0E917F0C728990140B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_24FF11E83863F6A32F580C7289902F4C" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsReportLineDomain_7F21102047323B175EB30C7289903140" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_24FF11E83863F6A32F580C7289902F4C" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_C0E9E2E7C7599BEF94C80C72899014C5" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2073876C70931A77EA150C728990B2DF" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_C0E9E2E7C7599BEF94C80C72899014C5" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2DA3F94B2C76EB3BB8660C7289908F4E" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2073876C70931A77EA150C728990B2DF" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_2DA3F94B2C76EB3BB8660C7289908F4E" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_1C04CB2A85D6D793DA300C7289901623" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_2073876C70931A77EA150C728990B2DF" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_1C04CB2A85D6D793DA300C7289901623" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationSummaryOfStockOptionPlansDetails" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationTables" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationWeightedAverageAssumptionsOfEmployeeStockOptionsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3217F42235871552AB030DF7D5CA1E19" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7DB79A00EF71EFD967290DF7D5C98440" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3217F42235871552AB030DF7D5CA1E19" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7DB79A00EF71EFD967290DF7D5C98440" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_1EEB8D732B23B3D7A6220DF7D5C9C03A" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_7DB79A00EF71EFD967290DF7D5C98440" xlink:to="loc_us-gaap_AwardTypeAxis_1EEB8D732B23B3D7A6220DF7D5C9C03A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63E582AA6A310EEE96410DF7D5C9F8E1_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1EEB8D732B23B3D7A6220DF7D5C9C03A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63E582AA6A310EEE96410DF7D5C9F8E1_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63E582AA6A310EEE96410DF7D5C9F8E1" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1EEB8D732B23B3D7A6220DF7D5C9C03A" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63E582AA6A310EEE96410DF7D5C9F8E1" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_A47544CC40FE15E2F3B60DF7D5C91D16" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_63E582AA6A310EEE96410DF7D5C9F8E1" xlink:to="loc_us-gaap_EmployeeStockMember_A47544CC40FE15E2F3B60DF7D5C91D16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_A60685BDB95B3E3B42560DF7D5CAAED8" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3217F42235871552AB030DF7D5CA1E19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_A60685BDB95B3E3B42560DF7D5CAAED8" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_C4514AC1B19E328CDC470DF7D5CADE12" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3217F42235871552AB030DF7D5CA1E19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_C4514AC1B19E328CDC470DF7D5CADE12" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_33E20DC42251838B58540DF7D5CAE6FA" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3217F42235871552AB030DF7D5CA1E19" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_33E20DC42251838B58540DF7D5CAE6FA" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_45EFCD69C46C60A8BCC70DF7D5CAB0C8" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_3217F42235871552AB030DF7D5CA1E19" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_45EFCD69C46C60A8BCC70DF7D5CAB0C8" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/ShareBasedCompensationWeightedAverageAssumptionsWithEmployeeStockPurchasePlanDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems_EDC0DA49CF62E56D5B6623BA323429AE" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTable_6727A754EC830130E9F323BA3234338F" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems_EDC0DA49CF62E56D5B6623BA323429AE" xlink:to="loc_us-gaap_ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTable_6727A754EC830130E9F323BA3234338F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_6C14703CF2ACFDA6C9E023BA32340B78" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeStockOwnershipPlanESOPDisclosuresTable_6727A754EC830130E9F323BA3234338F" xlink:to="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_6C14703CF2ACFDA6C9E023BA32340B78" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_41BA6567D11D4B22CBF823BA32340161_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_6C14703CF2ACFDA6C9E023BA32340B78" xlink:to="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_41BA6567D11D4B22CBF823BA32340161_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_41BA6567D11D4B22CBF823BA32340161" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis_6C14703CF2ACFDA6C9E023BA32340B78" xlink:to="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_41BA6567D11D4B22CBF823BA32340161" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_65D5B21EA254A2722F5123BA32347B27" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPPlanDomain_41BA6567D11D4B22CBF823BA32340161" xlink:to="loc_us-gaap_EmployeeStockMember_65D5B21EA254A2722F5123BA32347B27" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_4886787AAA678C1047F123BA32344581" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems_EDC0DA49CF62E56D5B6623BA323429AE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_4886787AAA678C1047F123BA32344581" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_6F8E528077D519F05D5623BA3234FFE3" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems_EDC0DA49CF62E56D5B6623BA323429AE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_6F8E528077D519F05D5623BA3234FFE3" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9E384797C403C341859123BA32347335" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems_EDC0DA49CF62E56D5B6623BA323429AE" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9E384797C403C341859123BA32347335" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_406101D2F09AC0CC82E223BA3234EA04" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems_EDC0DA49CF62E56D5B6623BA323429AE" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_406101D2F09AC0CC82E223BA3234EA04" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/SupplementalDisclosureOfCashFlowInformation" xlink:type="extended" />
  <definitionLink xlink:role="http://www.onsemi.com/role/SupplementalDisclosureOfCashFlowInformationNonCashFinancingActivitiesAndCashPaymentsDetails" xlink:type="extended">
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ValuationAllowanceLineItems" xlink:label="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:type="locator" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ValuationAllowanceTable" xlink:label="loc_us-gaap_ValuationAllowanceTable_3E9E7204EE2ECCAA6F4B2AF73F0F4256" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_ValuationAllowanceTable_3E9E7204EE2ECCAA6F4B2AF73F0F4256" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ValuationAllowanceByDeferredTaxAssetAxis" xlink:label="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_58F58B0AED4A0B54EA8C2AF779437D16" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAllowanceTable_3E9E7204EE2ECCAA6F4B2AF73F0F4256" xlink:to="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_58F58B0AED4A0B54EA8C2AF779437D16" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxAssetDomain" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_6933C863865EC0FBF5C72AFDE614BE65_default" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_58F58B0AED4A0B54EA8C2AF779437D16" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_6933C863865EC0FBF5C72AFDE614BE65_default" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_DeferredTaxAssetDomain" xlink:label="loc_us-gaap_DeferredTaxAssetDomain_6933C863865EC0FBF5C72AFDE614BE65" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowanceByDeferredTaxAssetAxis_58F58B0AED4A0B54EA8C2AF779437D16" xlink:to="loc_us-gaap_DeferredTaxAssetDomain_6933C863865EC0FBF5C72AFDE614BE65" xlink:type="arc" />
    <loc xlink:href="onnn-20130628.xsd#onnn_DeferredTaxAssetsandReversalofReservesofInterestforPotentialLiabilitiesMember" xlink:label="loc_onnn_DeferredTaxAssetsandReversalofReservesofInterestforPotentialLiabilitiesMember_2404477A94EE6CC591D02AF93C71FE86" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredTaxAssetDomain_6933C863865EC0FBF5C72AFDE614BE65" xlink:to="loc_onnn_DeferredTaxAssetsandReversalofReservesofInterestforPotentialLiabilitiesMember_2404477A94EE6CC591D02AF93C71FE86" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CapitalExpendituresIncurredButNotYetPaid" xlink:label="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_CC483C70F150377A89542AEBDA8207CB" xlink:type="locator" />
    <definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_CapitalExpendituresIncurredButNotYetPaid_CC483C70F150377A89542AEBDA8207CB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_CapitalLeaseObligationsIncurred" xlink:label="loc_us-gaap_CapitalLeaseObligationsIncurred_A48A5B6BFEC5FC04592D2AEBDA8247EB" xlink:type="locator" />
    <definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_CapitalLeaseObligationsIncurred_A48A5B6BFEC5FC04592D2AEBDA8247EB" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ProceedsFromInterestReceived" xlink:label="loc_us-gaap_ProceedsFromInterestReceived_A98E08E4D89290F2129D2AEBDA82A752" xlink:type="locator" />
    <definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_ProceedsFromInterestReceived_A98E08E4D89290F2129D2AEBDA82A752" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_InterestPaid" xlink:label="loc_us-gaap_InterestPaid_AAE55DC1414E325D176A2AEBDA82629B" xlink:type="locator" />
    <definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_InterestPaid_AAE55DC1414E325D176A2AEBDA82629B" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_DCB018E85C7447A609E62AEBDA820A80" xlink:type="locator" />
    <definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_DCB018E85C7447A609E62AEBDA820A80" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_GainOnBusinessInterruptionInsuranceRecovery" xlink:label="loc_us-gaap_GainOnBusinessInterruptionInsuranceRecovery_2EEE267A8173B0F7F9442AEBDA82971A" xlink:type="locator" />
    <definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_GainOnBusinessInterruptionInsuranceRecovery_2EEE267A8173B0F7F9442AEBDA82971A" xlink:type="arc" />
    <loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_1BBAD27AD964B9771A4F2AF685BEEE72" xlink:type="locator" />
    <definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowanceLineItems_B1D7BE35069A866B69352AFD3A4CD7D2" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_1BBAD27AD964B9771A4F2AF685BEEE72" xlink:type="arc" />
  </definitionLink>
  <definitionLink xlink:role="http://www.onsemi.com/role/SupplementalDisclosureOfCashFlowInformationTables" xlink:type="extended" />
</linkbase>
