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Form 8-K

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D. C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

April 6, 2006

Date of report (Date of earliest event reported)

ON Semiconductor Corporation

(Exact name of registrant as specified in its charter)

Delaware

000-30419

36-3840979

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(I.R.S. Employer

Identification Number)

ON Semiconductor Corporation

5005 E. McDowell Road

Phoenix, Arizona

85008

(Address of principal executive offices)

(Zip Code)

602-244-6600

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 1.01.

Entry into a Material Definitive Agreement.

On February 6, 2006, ON Semiconductor Corporation (“Company”) entered into an Underwriting Agreement (“Agreement”) with Morgan Stanley & Co. Incorporated (“Underwriter”) whereby the Company agreed to sell to the Underwriter and the Underwriter, subject to certain conditions, agreed to purchase 10.5 million shares of the Company’s common stock. Under the Agreement, the Company granted the Underwriter an option to purchase up to an additional approximate 1.1 million shares of its common stock during a period of 30 days after the date of the Agreement in order to cover over-allotments, if any. The Agreement provides for a public offering price of $7.00 per share and discounts and commissions to the Underwriter of $.14 per share. The Underwriter and its affiliates have from time to time performed, and may in the future perform, various investment banking, financial advisory and lending services for the Company and its affiliates, for which they have received and will receive customary fees. See Item 8.01 of this Current Report on Form 8-K for related information with respect to this securities offering.

A copy of the Agreement is attached hereto as Exhibit 1.1 to this Current Report on Form 8-K and is incorporated herein by reference. The above description is qualified in its entirety by reference to the filed Agreement.

Item 8.01.

Other Events.

On February 6, 2006, the Company announced, via a news release, its proposed offering of the Company’s common stock to be issued under an existing shelf registration statement on file with the Securities and Exchange Commission. Also on February 6, 2006, the Company later announced, via a second news release, the pricing of its offering of common stock. Copies of both news releases referenced above are furnished as Exhibits 99.1 and 99.2 to this Current Report on Form 8-K.

The information in this Item 8.01 (including Exhibits 99.1 and 99.2) shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (“Exchange Act”), or otherwise subject to liability of that section. In addition, this information shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, regardless of any general incorporation language in such filing, except as shall be expressly set forth by specific reference in the filing.

Item 9.01.

Financial Statements and Exhibits.

(a)

Financial Statements of Businesses Acquired

Not applicable.

(b)

Pro Forma Financial Information

Not applicable.

(c)

Exhibits

The following exhibit is filed as part of this Current Report on Form 8-K:


Exhibit No.		Description

1.1		Underwriting Agreement dated April 6, 2006 between ON Semiconductor Corporation and Morgan Stanley & Co. Incorporated.

The following exhibits are furnished as part of this Current Report on Form 8-K:


Exhibit No.		Description

99.1		News release for ON Semiconductor Corporation dated April 6, 2006 titled “ON Semiconductor Announces Offering of Common Stock.”

99.2		News release for ON Semiconductor Corporation dated April 6, 2006 titled “ON Semiconductor Announces Pricing of Common Stock.”

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


	ON SEMICONDUCTOR CORPORATION (Registrant)

Date: April 11, 2006	By:	/s/ DONALD A. COLVIN
		Donald A. Colvin
		Chief Financial Officer

EXHIBIT INDEX


Exhibit No.		Description
1.1		Underwriting Agreement dated April 6, 2006 between ON Semiconductor Corporation and Morgan Stanley & Co. Incorporated.

99.1		News release for ON Semiconductor Corporation dated April 6, 2006 titled “ON Semiconductor Announces Offering of Common Stock.”

99.2		News release for ON Semiconductor Corporation dated April 6, 2006 titled “ON Semiconductor Announces Pricing of Common Stock.”

Underwriting Agreement

Exhibit 1.1

ON SEMICONDUCTOR CORPORATION

10,500,000 SHARES OF COMMON STOCK ($0.01 PAR VALUE)

UNDERWRITING AGREEMENT

April 6, 2006

Morgan Stanley & Co. Incorporated

1585 Broadway

New York, New York 10036

Dear Sirs and Mesdames:

ON SEMICONDUCTOR CORPORATION, a Delaware corporation (the “Company”), proposes to issue and sell to Morgan Stanley & Co. Incorporated (“Morgan Stanley”) 10,500,000 shares of its common stock, $0.01 par value per share (the “Firm Shares”). The Company also proposes to issue and sell to Morgan Stanley not more than an additional 1,131,063 shares of its common stock, $0.01 par value per share (the “Additional Shares”), if and to the extent that Morgan Stanley shall have determined to exercise the right to purchase such shares of common stock granted to Morgan Stanley in Section 2 hereof. The Firm Shares and the Additional Shares are hereinafter collectively referred to as the “Shares”. The shares of common stock, $0.01 par value per share, of the Company to be outstanding after giving effect to the sales contemplated hereby are hereinafter referred to as the “Common Stock”.

The Company has filed with the Securities and Exchange Commission (the “Commission”) a registration statement, on Form S-3 (No. 111702), including a prospectus, relating to the registration of certain shares of Common Stock (the “Shelf Securities”), including the Shares, to be sold from time to time by the Company. The registration statement as amended to the date of this Agreement, including the information (if any) deemed to be part of the registration statement at the time of effectiveness pursuant to Rule 430A or Rule 430B under the Securities Act of 1933, as amended (the “Securities Act”), is hereinafter referred to as the “Registration Statement”, and the related prospectus covering the Shelf Securities dated January 12, 2004 in the form first used to confirm sales of the Securities (or in the form first made available to Morgan Stanley by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “Basic Prospectus”. The Basic Prospectus, as supplemented by the prospectus supplement specifically relating to the Shares in the form first used to confirm sales of the Shares (or in the form first made available to Morgan Stanley by the Company to meet requests of purchasers pursuant to Rule 173 under the Securities Act) is hereinafter referred to as the “Prospectus”, and the term “preliminary prospectus” means any preliminary form of the Prospectus. For purposes of this Agreement, “free writing prospectus” has the meaning set forth in Rule 405 under the Securities Act, “Time of Sale Prospectus” means the preliminary prospectus together with the free writing prospectuses, if any, each identified in Schedule I hereto and the other information, if any, identified in Schedule I hereto, and “broadly available road show” means a “bona fide electronic road

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show” as defined in Rule 433(h)(5) under the Securities Act that has been made available without restriction to any person. As used herein, the terms “Registration Statement”, “Basic Prospectus”, “preliminary prospectus”, “Time of Sale Prospectus” and “Prospectus” shall include the documents, if any, incorporated by reference therein. If the Company has filed an abbreviated registration statement to register additional shares of Common Stock pursuant to Rule 462(b) under the Securities Act (the “Rule 462 Registration Statement”), then any reference herein to the term “Registration Statement” shall be deemed to include such Rule 462 Registration Statement. The terms “supplement,” “amendment,” and “amend” as used herein with respect to the Registration Statement, the Basic Prospectus, the Time of Sale Prospectus, any preliminary prospectus or free writing prospectus shall include all documents subsequently filed by the Company with the Commission pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”), that are deemed to be incorporated by reference therein.

1. Representations and Warranties. The Company represents and warrants to and agrees with Morgan Stanley that:

(a) The Company meets the requirements for use of Form S-3 under the Securities Act. The Registration Statement has become effective; no stop order suspending the effectiveness of the Registration Statement is in effect, and no proceedings for such purpose are pending before or threatened by the Commission.

(b) (i) Each document, if any, filed or to be filed pursuant to the Exchange Act and incorporated by reference in the Time of Sale Prospectus or the Prospectus complied or will comply when so filed in all material respects with the Exchange Act and the applicable rules and regulations of the Commission thereunder, (ii) each part of the Registration Statement, when such part became effective, did not contain, and each such part, as amended or supplemented, if applicable, will not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (iii) the Registration Statement as of the date hereof does not contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein not misleading, (iv) the Registration Statement complies, and the Prospectus, as of its date, will comply, and the Registration Statement and the Prospectus, as amended or supplemented, if applicable, as of the Closing Date (as defined in Section 4), will comply, in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder, (v) the Time of Sale Prospectus does not, and at the time of each sale of the Shares in connection with the offering when the Prospectus is not yet available to prospective purchasers, the Time of Sale Prospectus, as then amended or supplemented by the Company, if applicable, will not, contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, (vi) each broadly available road show, if any, when considered together as a whole with the Time of Sale Prospectus, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading and (vii) the Prospectus, as of its date, will not contain and, as amended or supplemented, if applicable, as of the Closing

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Date, will not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements therein, in the light of the circumstances under which they were made, not misleading, except that the representations and warranties set forth in this paragraph do not apply to statements or omissions in the Registration Statement, the Time of Sale Prospectus or the Prospectus based upon information relating to Morgan Stanley furnished to the Company in writing by Morgan Stanley expressly for use therein.

(c) The Company is not an “ineligible issuer” in connection with the offering pursuant to Rules 164 under the Securities Act. Any free writing prospectus that the Company is required to file pursuant to Rule 433(d) under the Securities Act has been, or will be, filed with the Commission in accordance with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Each free writing prospectus that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or that was prepared by or on behalf of or used or referred to by the Company complies or will comply in all material respects with the requirements of the Securities Act and the applicable rules and regulations of the Commission thereunder. Except for the free writing prospectuses, if any, identified in Schedule I hereto, and electronic road shows each furnished to you before first use, the Company has not prepared, used or referred to, and will not, without your prior consent, prepare, use or refer to, any free writing prospectus.

(d) The Company has been duly incorporated, is validly existing as a corporation in good standing under the laws of the State of Delaware, has the corporate power and authority to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not, singly or in the aggregate, have a material adverse effect on the Company and its subsidiaries, taken as a whole.

(e) Each subsidiary of the Company has been duly incorporated or formed, is validly existing as a corporation, limited liability company or similar entity in good standing under the laws of the jurisdiction of its incorporation or formation, as the case may be, has all power and authority necessary to own its property and to conduct its business as described in the Time of Sale Prospectus and is duly qualified to transact business and is in good standing in each jurisdiction in which the conduct of its business or its ownership or leasing of property requires such qualification, except to the extent that the failure to be so qualified or be in good standing would not have a material adverse effect on the Company and its subsidiaries, taken as a whole; all of the issued and outstanding shares of capital stock, membership interests or other equity interests of each subsidiary of the Company have been duly authorized and validly issued; are, in the case of capital stock or membership interests of subsidiaries organized under the United States, fully paid and nonassessable or, in the case of membership interests of any subsidiary of the Company that is a Delaware limited liability company, are not subject to assessment by such subsidiary of the Company for additional capital contributions; and the shares of capital stock, membership interests or other equity interests of each subsidiary owned by the Company, directly or through subsidiaries (other

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than (i) those shares of capital stock of Leshan-Phoenix Semiconductor Co., Ltd. that are owned by minority shareholders, (ii) 60% of the shares of capital stock of Amicus Realty Corporation and (iii) in the case of foreign subsidiaries, directors’ qualifying shares or shares required by applicable law to be held by a person other than Semiconductor Components Industries, LLC, the Company or a subsidiary thereof), are owned free from any security interest, mortgage, pledge, lien or encumbrance, or defect (collectively, “Liens”), except for (A) Liens described in the Time of Sale Prospectus and (B) Liens pursuant to or contemplated by the Amended and Restated Credit Agreement dated as of August 4, 1999, as amended and restated through the Closing Date (collectively, the “Permitted Liens”).

(f) No consent, approval, authorization, or order of, or filing with, any governmental agency or body or any court is required for the consummation of the transactions contemplated by this Agreement by the Company, except (i) such as may be required by the securities or Blue Sky laws of the various states in connection with the offer and sale of the Shares or (ii) where the failure to obtain such consent, approval, authorization, order or filing would not, singly or in the aggregate, have a material adverse effect on the Company and its subsidiaries, taken as a whole.

(g) Except as disclosed in the Time of Sale Prospectus, the Company and its subsidiaries have good and marketable title in fee simple to all real property and good and marketable title to all other properties and assets owned by them that is material to the business of the Company and its subsidiaries, in each case free from Liens, except Permitted Liens, that would materially and adversely affect the value thereof or materially interfere with the use made or to be made thereof by them.

(h) The Company and its subsidiaries own, possess or can acquire on reasonable terms, the trademarks, trade names and other rights to inventions, know-how, patents, copyrights, confidential information and other intellectual property (collectively, “intellectual property rights”) necessary to conduct the business now operated by them, and have not received any notice of infringement of or conflict with asserted rights of others with respect to any intellectual property rights that, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would have a material adverse effect on the Company and its subsidiaries, taken as a whole, except in each case as described in the Time of Sale Prospectus.

(i) No labor dispute with the employees of the Company or any of its subsidiaries exists, or, to the knowledge of the Company, is imminent that would have a material adverse effect on the Company and its subsidiaries, taken as a whole.

(j) The Company and its subsidiaries possess all certificates, authorizations and permits issued by the appropriate Federal, state or foreign regulatory authorities necessary to conduct their respective businesses, and neither the Company nor any of its subsidiaries has received any notice of proceedings relating to the revocation or modification of any such certificate, authorization or permit that, singly or in the aggregate, if the subject of an unfavorable decision, ruling or finding, would have a material adverse effect on the Company and its subsidiaries, taken as a whole.

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(k) The Company and each of its subsidiaries maintain a system of internal accounting controls sufficient to provide reasonable assurance, in all material respects, that (1) transactions are executed in accordance with management’s general or specific authorizations; (2) transactions are recorded as necessary to permit preparation of financial statements in conformity with generally accepted accounting principles and to maintain asset accountability; (3) the recorded accountability for assets is compared with the existing assets at reasonable intervals and appropriate action is taken with respect to any differences, and (4) transactions are recorded as necessary to prevent or timely detect unauthorized acquisition, use or disposition of the Company’s assets that could have a material effect on the Company’s financial statements. Except as described in the Time of Sale Prospectus, since the most recent audit of the effectiveness of the Company’s internal control over financial reporting, there has been (i) no material weakness in the Company’s internal control over financial reporting (whether or not remediated) and (ii) no change in the Company’s internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, the Company’s internal control over financial reporting.

(l) PricewaterhouseCoopers LLP are independent certified public accountants with respect to the Company as required by the Securities Act and the rules and regulations of the Commission thereunder.

(m) This Agreement has been duly authorized, executed and delivered by the Company.

(n) The authorized capital stock of the Company conforms to the description thereof contained in the Time of Sale Prospectus.

(o) The shares of Common Stock outstanding prior to the issuance of the Shares have been duly authorized and are validly issued, fully paid and non-assessable.

(p) The Shares have been duly authorized and, when issued and delivered in accordance with the terms of this Agreement, will be validly issued, fully paid and non assessable, and the issuance of such Shares will not be subject to any preemptive or similar rights.

(q) The execution and delivery by the Company of, and the performance by the Company of its obligations under, this Agreement and the offering and sale of the Shares will not result in a breach or violation of any of the terms and provisions of, or constitute a default under, any statute, any rule, regulation or order of any governmental agency or body or any court, domestic or foreign, having jurisdiction over the Company or any subsidiary of the Company or any of their properties, or any agreement or instrument to which the Company or any such subsidiary is a party or by which the Company or any such subsidiary is bound or to which any of the properties of the Company or any such subsidiary is subject, or the charter or by-laws of the Company or any such subsidiary, and the Company has full power and authority to offer and sell the Shares as contemplated by this Agreement, except for such breaches, violations or defaults that would not have a material adverse effect on the Company and its subsidiaries, taken as a whole and except such as may be required by the

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securities or Blue Sky laws of the various states in connection with the offer and sale of the Shares.

(r) No “nationally recognized statistical rating organization” as such term is defined for purposes of Rule 436(g)(2) under the Securities Act (i) has imposed (or has informed the Company that it is considering imposing) any condition (financial or otherwise) on the Company’s retaining any rating assigned to the Company or any securities of the Company or (ii) has given notice to the Company that it is considering (A) the downgrading, suspension, or withdrawal of, or any review for a possible change that does not indicate the direction of the possible change in, any rating so assigned or (B) any change in the outlook for any rating of Company or any securities of the Company.

(s) The financial statements included in the Time of Sale Prospectus, the Prospectus or Registration Statement present fairly the financial position of the Company and its consolidated subsidiaries as of the dates shown and their results of operations and cash flows for the periods shown and, except as disclosed in the Time of Sale Prospectus, the Prospectus or Registration Statement, such financial statements have been prepared in conformity with the generally accepted accounting principles in the United States applied on a consistent basis.

(t) Except as disclosed in the Time of Sale Prospectus, since the date of the latest audited financial statements included in the Time of Sale Prospectus, there has been no material adverse change, or any development involving a prospective material adverse change, in the condition (financial or otherwise) or in the earnings, business or operations of the Company and its subsidiaries taken as a whole, and, except as disclosed in or contemplated by the Time of Sale Prospectus, there has been no dividend or distribution of any kind declared, paid or made by the Company on any class of its capital stock.

(u) Except as disclosed in the Time of Sale Prospectus, there is no pending action, suit or proceeding against or affecting the Company, any of its subsidiaries or any of their respective properties that, individually or in the aggregate, is reasonably likely to result in a material adverse effect on the Company and its subsidiaries, taken as a whole, or would materially and adversely affect the ability of the Company to perform its obligations under this Agreement, or which is otherwise material in the context of the sale of the Shares; and, to the Company’s knowledge, there is no such action, suit or proceeding threatened.

(v) Each preliminary prospectus filed as part of the registration statement as originally filed or as part of any amendment thereto, or filed pursuant to Rule 424 under the Securities Act, complied when so filed in all material respects with the Securities Act and the applicable rules and regulations of the Commission thereunder, except that no representation is made as to the omission of the numbers of Firm Shares, Additional Shares and Shares and other information derived from the foregoing, to the extent any of the foregoing was omitted from the initial filing of the Registration Statement.

(w) Neither the Company nor any of its subsidiaries is an open-end investment company, unit investment trust or face-amount certificate company that is or is required to be registered under Section 8 of the United States Investment Company Act of 1940 (the

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“Investment Company Act”); and neither the Company nor any of its subsidiaries is and, after giving effect to the issuance and sale of the Shares and the application of the proceeds thereof as described in the Time of Sale Prospectus, will be an “investment company” as defined in the Investment Company Act.

(x) Except as disclosed in the Time of Sale Prospectus or except as would, singly and in the aggregate, not have a material adverse effect on the Company and its subsidiaries, taken as a whole, the Company and its subsidiaries (1) are in compliance with any and all applicable foreign, Federal, state and local laws and regulations relating to the protection of human health and safety, the environment or hazardous or toxic substances or wastes, pollutants or contaminants (“Environmental Laws”), (2) have received all permits, licenses or other approvals required of them under applicable Environmental Laws to conduct their respective businesses and (3) are in compliance with all terms and conditions of any such permit, license or approval.

(y) Except as disclosed in the Time of Sale Prospectus, there are no costs or liabilities associated with Environmental Laws (including, without limitation, any capital or operating expenditures required for cleanup, closure of properties or compliance with Environmental Laws or any permit, license or approval, any related constraints on operating activities and any potential liabilities to third parties) that would, singly or in the aggregate, have a material adverse effect on the Company and its subsidiaries, taken as a whole.

(z) There are no contracts, agreements or understandings between the Company and any person granting such person the right to require the Company to file a registration statement under the Securities Act with respect to any securities of the Company or to require the Company to include such securities with the Shares registered pursuant to the Registration Statement, except as described in the Time of Sale Prospectus.

(aa) Neither the Company nor any of its subsidiaries is in violation of its respective charter or by-laws or in default in the performance of any obligation, agreement, covenant or condition contained in any indenture, loan agreement, mortgage, lease or other agreement or instrument, except for such defaults that, singularly or in the aggregate, would not reasonably be expected to have a material adverse effect on the Company and its subsidiaries, taken as a whole, to which the Company or any of its subsidiaries is a party or by which the Company or any of its subsidiaries or their respective property is bound.

2. Agreements to Sell and Purchase. The Company hereby agrees to sell to Morgan Stanley, and Morgan Stanley, upon the basis of the representations and warranties herein contained, but subject to the conditions hereinafter stated, agrees to purchase from the Company the Firm Shares at $6.86 a share (the “Purchase Price”).

On the basis of the representations and warranties contained in this Agreement, and subject to its terms and conditions, the Company agrees to sell to Morgan Stanley the Additional Shares, and Morgan Stanley shall have the right to purchase up to 1,131,063 Additional Shares at the Purchase Price. If Morgan Stanley elects to exercise such option in whole or from time to time in part, Morgan Stanley shall so notify the Company in writing not later than 30 days after the date of this Agreement. Any exercise notice shall specify the

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number of Additional Shares to be purchased by Morgan Stanley and the date on which such shares are to be purchased. Each purchase date must be at least one business day after the written notice is given and may not be earlier than the Closing Date for the Firm Shares nor later than ten business days after the date of such notice. Should such date be subsequent to the Closing Date, Morgan Stanley shall provide such notice no later than three days prior to such date. Additional Shares may be purchased as provided in Section 4 hereof solely for the purpose of covering over-allotments made in connection with the offering of the Firm Shares.

The Company hereby agrees that, without the prior written consent of Morgan Stanley, it will not, during the period ending 30 days after the date of the Prospectus, (i) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (ii) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (i) or (ii) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise. The foregoing sentence shall not apply to (A) the Shares to be sold hereunder, (B) the issuance by the Company of shares of Common Stock upon the exercise of an option or warrant or the conversion of a security outstanding on the date hereof, or in the case of an option granted after the date hereof, pursuant to existing employee benefit plans of the Company or any of its subsidiaries, of which Morgan Stanley has been advised in writing, (C) the granting by the Company of any options to purchase shares of Common Stock or any restricted stock units or the sale by the Company of any shares of Common Stock, in each case pursuant to any existing employee benefit plan or direct stock plan of the Company or any of its subsidiaries, (D) the issuance by the Company of any shares of Common Stock in connection with the acquisition of or merger with or into any other company or the acquisition of any assets, (E) transfers and dispositions between one or more affiliates of Texas Pacific Group or partners, shareholders or members of any such affiliate, or (F) the sale of Common Stock by directors or executive officers under existing plans or agreements entered into prior to the date hereof that establish plans meeting the requirements of Rule 10b5-1 under the Exchange Act for the pre-arranged sale of shares of Common Stock, provided, that in the case of any issuance, transfer or disposition pursuant to clause (D) or (E), (i) each recipient of such shares shall agree in writing, for the benefit of Morgan Stanley, that such shares shall remain subject to restrictions identical to those contained in the first sentence of this paragraph for the remainder of the period for which the Company is bound thereunder, and each such recipient shall execute and deliver to Morgan Stanley a duplicate of such writing, and (ii) if a filing by any party to such issuance, transfer or disposition (issuer, transferor, disposer, recipient or transferee) under Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), shall be required in connection with such issuance, transfer or disposition (other than a filing on a Form 5 made after the expiration of the 30-day period referred to above), such party shall provide Morgan Stanley no less than one day prior written notice of such filing (it being understood that no such filing shall be made by any such party if not required to be made under the Exchange Act).

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Notwithstanding the foregoing, during the period from the second business day after the day on which the Company’s quarterly earnings for the first fiscal quarter of 2006 have been publicly released until the earlier of (i) the 30^th day after the date of the Prospectus and (ii) May 31, 2006, the Company may permit sales of up to an aggregate of 200,000 shares of Common Stock of the Company owned by individuals listed in Schedule II.

3. Terms of Public Offering. The Company is advised by you that Morgan Stanley proposes to make a public offering of the Shares as soon after this Agreement has become effective as in your judgment is advisable. The Company is further advised by you that the Shares are to be offered to the public initially at $7.00 a share (the “Public Offering Price”) and to certain dealers selected by you at a price that represents a concession not in excess of $0.084 a share under the Public Offering Price.

4. Payment and Delivery. Payment for the Firm Shares shall be made to the Company in Federal or other funds immediately available at the offices of Cravath, Swaine & Moore LLP in New York City against delivery of such Firm Shares for the account of Morgan Stanley at 10:00 a.m. New York City Time on April 12, 2006, or at such other time on the same or such other date, not later than the fifth business day thereafter, as may be designated in writing by you. The time and date of such payment are hereinafter referred to as the “Closing Date”.

Payment for any Additional Shares shall be made to the Company in Federal or other funds immediately available in New York City against delivery of such Additional Shares for the account of the Morgan Stanley at 10:00 a.m., New York City time, on the date specified in the notice described in Section 2 or at such other time on the same or on such other date, in any event not later than May 19, 2006, as shall be designated in writing by you. The time and date of such payment are hereinafter referred to as the “Option Closing Date”.

The Firm Shares and Additional Shares shall be registered in such names and in such denominations as you shall request in writing not later than one full business day prior to the Closing Date or the Option Closing Date, as the case may be. The Firm Shares and Additional Shares shall be delivered to you on the Closing Date or the Option Closing Date, as the case may be, with any transfer taxes payable in connection with the transfer of the Shares to you duly paid, against payment of the Purchase Price therefor.

5. Conditions to Morgan Stanley’s Obligations. The obligations of the Company to sell the Shares to Morgan Stanley and the obligation of Morgan Stanley to purchase and pay for the Shares on the Closing Date are subject to the condition that the Prospectus, as amended or supplemented, in relation to the Shares, shall have been filed with the Commission pursuant to Rule 424(b) within the applicable time period prescribed for such filing by the rules and regulations under the Securities Act; as of the Closing Date, no stop order suspending the effectiveness of the Registration Statement shall be in effect or shall be pending or, to the knowledge of the Company, threatened by the Commission.

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The several obligations of Morgan Stanley are subject to the following further conditions:

(a) Subsequent to the execution and delivery of this Agreement and prior to the Closing Date:

(i) there shall not have occurred any downgrading, nor shall any notice have been given of any intended or potential downgrading or of any review for a possible change that does not indicate the direction of the possible change, in the rating accorded any of the Company’s securities by any “nationally recognized statistical rating organization,” as such term is defined for purposes of Rule 436(g)(2) under the Securities Act; and

(ii) there shall not have occurred any change, or any development involving a prospective change, in the condition, financial or otherwise, or in the earnings, business or operations of the Company and its subsidiaries, taken as a whole, from that set forth in the Time of Sale Prospectus that, in your judgment, is material and adverse and that makes it, in your judgment, impracticable to market the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus.

(b) Morgan Stanley shall have received on the Closing Date a certificate, dated the Closing Date and signed by Keith D. Jackson, as chief executive officer, and Donald Colvin, as chief financial officer, to the effect set forth in Section 5(a)(i) above and to the effect that the representations and warranties of the Company contained in this Agreement are true and correct as of the Closing Date and that the Company has complied with all of the agreements and satisfied all conditions on its part to be performed or satisfied hereunder on or before the Closing Date.

The officers signing and delivering such certificate may rely upon the best of his or her knowledge as to proceedings threatened.

(c) Morgan Stanley shall have received on the Closing Date from George H. Cave, General Counsel of the Company, dated the Closing Date, an opinion in form and substance reasonably satisfactory to Morgan Stanley.

(d) Morgan Stanley shall have received on the Closing Date from Cleary Gottlieb Steen & Hamilton LLP, special counsel to the Company, dated the Closing Date, an opinion and letter in form and substance reasonably satisfactory to Morgan Stanley.

(e) Morgan Stanley shall have received on the Closing Date an opinion of Cravath, Swaine & Moore LLP, counsel for Morgan Stanley, dated the Closing Date, in form and substance reasonably satisfactory to Morgan Stanley.

(f) Morgan Stanley shall have received, on each of the date hereof and the Closing Date, a letter dated the date hereof or the Closing Date, as the case may be, in form and substance satisfactory to Morgan Stanley, from PricewaterhouseCoopers LLP, independent certified public accountants, containing statements and information of the type ordinarily included in accountants’ “comfort letters” to underwriters with respect to the financial statements and certain financial information contained in the Registration Statement, the Time of Sale Prospectus and the Prospectus and as contemplated, and only if

- 10 -

permitted, by Statement of Auditing Standards No. 72; provided that the letter delivered on the Closing Date shall use a “cut-off date” not earlier than the date hereof.

(g) The “lockup” agreements, each substantially in the form of Exhibit A hereto, between you and the directors and certain executive officers of the Company listed in Schedule II hereto, relating to sales and certain other dispositions of shares of Common Stock or certain other securities, delivered to you on or before the date hereof, shall be in full force and effect on the Closing Date.

(h) The “lock up” agreement, substantially in the form of Exhibit B hereto, between you, TPG Semiconductor Holdings LLC and TPG ON Holdings LLC, relating to sales and certain other dispositions of shares of Common Stock or certain other securities, delivered to you on or before the date hereof, shall be in full force and effect on the Closing Date.

The obligation of Morgan Stanley to purchase Additional Shares hereunder is subject to the delivery to you on the Option Closing Date of such documents as you may reasonably request with respect to the good standing of the Company, the due authorization and issuance of the Additional Shares and other matters related to the issuance of the Additional Shares.

6. Covenants of the Company. In further consideration of the agreements of Morgan Stanley herein contained, the Company covenants with Morgan Stanley as follows:

(a) To furnish to you, without charge, a signed copy of the Registration Statement (including exhibits thereto and documents incorporated by reference) and to deliver to Morgan Stanley and to any dealer upon request during the period mentioned in Section 6(e) or 6(f) below, as many copies of the Time of Sale Prospectus, the Prospectus, any documents incorporated therein by reference therein and any supplements and amendments thereto or to the Registration Statement as you may reasonably request.

(b) Prior to the completion of this public offering, before amending or supplementing the Registration Statement, the Time of Sale Prospectus or the Prospectus, to furnish to you a copy of each such proposed amendment or supplement and not to file any such proposed amendment or supplement to which you reasonably object, and to file with the Commission within the applicable period specified in Rule 424(b) under the Securities Act any prospectus required to be filed pursuant to such Rule.

(c) To furnish to you a copy of each proposed free writing prospectus to be prepared by or on behalf of, used by, or referred to by the Company and not to use or refer to any proposed free writing prospectus to which you reasonably object.

(d) Not to take any action that would result in Morgan Stanley or the Company being required to file with the Commission pursuant to Rule 433(d) under the Securities Act a free writing prospectus prepared by or on behalf of Morgan Stanley that Morgan Stanley otherwise would not have been required to file thereunder.

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(e) If the Time of Sale Prospectus is being used to solicit offers to buy the Shares at a time when the Prospectus is not yet available to prospective purchasers and any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Time of Sale Prospectus in order to make the statements therein, in the light of the circumstances, not misleading, or if any event shall occur or condition exist as a result of which the Time of Sale Prospectus conflicts with the information contained in the Registration Statement then on file, or if, in the opinion of counsel for Morgan Stanley, it is necessary to amend or supplement the Time of Sale Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at its own expense, to Morgan Stanley and to any dealer upon request, either amendments or supplements to the Time of Sale Prospectus so that the statements in the Time of Sale Prospectus as so amended or supplemented will not, in the light of the circumstances when delivered to a prospective purchaser, be misleading or so that the Time of Sale Prospectus, as amended or supplemented, will no longer conflict with the Registration Statement, or so that the Time of Sale Prospectus, as amended or supplemented, will comply with applicable law.

(f) If, during such period after the first date of the public offering of the Shares as in the opinion of counsel for Morgan Stanley the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) under the Securities Act) is required by law to be delivered in connection with sales by Morgan Stanley or a dealer, any event shall occur or condition exist as a result of which it is necessary to amend or supplement the Prospectus in order to make the statements therein, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) under the Securities Act) is delivered to a purchaser, not misleading, or if, in the opinion of counsel for Morgan Stanley, it is necessary to amend or supplement the Prospectus to comply with applicable law, forthwith to prepare, file with the Commission and furnish, at its own expense, to Morgan Stanley and to the dealers (whose names and addresses you will furnish to the Company) to which Shares may have been sold by you and to any other dealers upon request, either amendments or supplements to the Prospectus so that the statements in the Prospectus as so amended or supplemented will not, in the light of the circumstances when the Prospectus (or in lieu thereof the notice referred to in Rule 173(a) under the Securities Act) is delivered to a purchaser, be misleading or so that the Prospectus, as amended or supplemented, will comply with applicable law.

(g) To endeavor to qualify the Shares for offer and sale under the securities or Blue Sky laws of such jurisdictions as you shall reasonably request; provided that neither the Company nor any of its subsidiaries shall be obligated to qualify as foreign corporations in any jurisdiction in which it is not so qualified or to file a general consent to service of process in any jurisdiction.

(h) To make generally available to the Company’s security holders and to you as soon as practicable an earning statement that satisfies the provisions of Section 11(a) of the Securities Act and the rules and regulations of the Commission thereunder.

(i) Whether or not the transactions contemplated in this Agreement are consummated or this Agreement is terminated, to pay or cause to be paid all expenses incident to the performance of its obligations under this Agreement, including: (i) the fees,

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disbursements and expenses of the Company’s counsel and the Company’s accountants in connection with the registration and delivery of the Shares under the Securities Act and all other fees or expenses in connection with the preparation and filing of the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, any free writing prospectus prepared by or on behalf of, used by, or referred to by the Company and amendments and supplements to any of the foregoing, including the filing fees payable to the Commission relating to the Shares (within the time required by Rule 456 (b)(1), if applicable), all printing costs associated therewith, and the mailing and delivering of copies thereof to Morgan Stanley and the dealers, in the quantities hereinabove specified, (ii) all costs and expenses related to the transfer and delivery of the Shares to Morgan Stanley, including any transfer or other taxes payable thereon, (iii) all filing fees and the reasonable fees and disbursements of counsel to Morgan Stanley incurred in connection with the review and qualification of the offering of the Shares by the National Association of Securities Dealers, Inc., (iv) all fees and expenses in connection with the preparation and filing of the registration statement on Form S-3 relating to the Common Stock and all costs and expenses incident to listing the Shares on the Nasdaq National Market, (v) the cost of printing certificates representing the Shares, (vi) the costs and charges of any transfer agent, registrar or depositary, (vii) the costs and expenses of the Company relating to any investor presentations on any “road show” undertaken in connection with the marketing of the offering of the Shares, including, without limitation, expenses associated with the preparation or dissemination of any electronic road show, expenses associated with the production of road show slides and graphics, fees and expenses of any consultants engaged in connection with the road show presentations with the prior written approval of the Company, costs and expenses associated with any conference rooms or presentation facilities used in connection with the road show presentations and travel and lodging expenses of the representatives and officers of the Company and any such consultants and (viii) all other costs and expenses incident to the performance of the obligations of the Company hereunder for which provision is not otherwise made in this Section; provided, however, that Morgan Stanley shall pay its own costs and expenses associated with lodging and provided, further, that Morgan Stanley and the Company shall each pay 50% of the costs of any limousine used or any aircraft chartered in connection with the “road show”. It is understood, however, that except as provided in this Section, Section 8 entitled “Indemnity and Contribution”, and the last paragraph of Section 10 below, Morgan Stanley will pay all of their costs and expenses, including fees and disbursements of their counsel, stock transfer taxes payable on resale of any of the Shares by them and any advertising expenses connected with any offers they may make.

(j) If requested by Morgan Stanley, to prepare a final term sheet relating to the offering of the Shares, containing only information that describes the final terms of the Shares or the offering in a form consented to by Morgan Stanley, and to file such final term sheet within the period required by Rule 433(d)(5)(ii) under the Securities Act following the date the final terms have been established for the offering of the Shares.

7. Morgan Stanley’s Covenants. Morgan Stanley covenants with the Company not to take any action that would result in the Company being required to file with the Commission under Rule 433(d) a free writing prospectus prepared by or on behalf of Morgan

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Stanley that otherwise would not be required to be filed by the Company thereunder, but for the action of Morgan Stanley.

8. Indemnity and Contribution. (a) The Company agrees to indemnify and hold harmless Morgan Stanley and each person, if any, who controls Morgan Stanley within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act from and against any and all losses, claims, damages and liabilities (including, without limitation, any legal or other expenses reasonably incurred in connection with defending or investigating any such action or claim) caused by any untrue statement or alleged untrue statement of a material fact contained in the Registration Statement or any amendment thereof, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus as defined in Rule 433(h) under the Securities Act, any Company information that the Company has filed, or is required to file, pursuant to Rule 433(d) under the Securities Act or the Prospectus or any amendment or supplement thereto, or caused by any omission or alleged omission to state therein a material fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as such losses, claims, damages or liabilities are caused by any such untrue statement or omission or alleged untrue statement or omission based upon information relating to Morgan Stanley furnished to the Company in writing by Morgan Stanley expressly for use therein.

(b) Morgan Stanley agrees to indemnify and hold harmless the Company, its directors, its officers who sign the Registration Statement and each person, if any, who controls the Company within the meaning of either Section 15 of the Securities Act or Section 20 of the Exchange Act to the same extent as the foregoing indemnity from the Company to Morgan Stanley, but only with reference to information relating to Morgan Stanley furnished to the Company in writing by Morgan Stanley expressly for use in the Registration Statement, any preliminary prospectus, the Time of Sale Prospectus, any issuer free writing prospectus or the Prospectus or any amendment or supplement thereto.

(c) In case any proceeding (including any governmental investigation) shall be instituted involving any person in respect of which indemnity may be sought pursuant to Section 8(a) or 8(b), such person (the “indemnified party”) shall promptly notify the person against whom such indemnity may be sought (the “indemnifying party”) in writing and the indemnifying party, upon request of the indemnified party, shall retain counsel reasonably satisfactory to the indemnified party to represent the indemnified party and any others the indemnifying party may designate in such proceeding and shall pay the fees and disbursements of such counsel related to such proceeding. In any such proceeding, any indemnified party shall have the right to retain its own counsel, but the fees and expenses of such counsel shall be at the expense of such indemnified party unless (i) the indemnifying party and the indemnified party shall have mutually agreed to the retention of such counsel or (ii) the named parties to any such proceeding (including any impleaded parties) include both the indemnifying party and the indemnified party and representation of both parties by the same counsel would be inappropriate due to actual or potential differing interests between them. It is understood that the indemnifying party shall not, in respect of the legal expenses of any indemnified party in connection with any proceeding or related proceedings in the same jurisdiction, be liable for the fees and expenses of more than one separate firm (in

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addition to any local counsel) for all such indemnified parties and that all such fees and expenses shall be reimbursed as they are incurred. Such firm shall be designated in writing by Morgan Stanley, in the case of parties indemnified pursuant to Section 8(a), and by the Company, in the case of parties indemnified pursuant to Section 8(b). The indemnifying party shall not be liable for any settlement of any proceeding effected without its written consent, but if settled with such consent or if there be a final judgment for the plaintiff, the indemnifying party agrees to indemnify the indemnified party from and against any loss or liability by reason of such settlement or judgment. Notwithstanding the foregoing sentence, if at any time an indemnified party shall have requested an indemnifying party to reimburse the indemnified party for fees and expenses of counsel as contemplated by the second and third sentences of this paragraph, the indemnifying party agrees that it shall be liable for any settlement of any proceeding effected without its written consent if (i) such settlement is entered into more than 60 days after receipt by such indemnifying party of the aforesaid request and (ii) such indemnifying party shall not have reimbursed the indemnified party in accordance with such request prior to the date of such settlement. No indemnifying party shall, without the prior written consent of the indemnified party, effect any settlement of any pending or threatened proceeding in respect of which any indemnified party is or could have been a party and indemnity could have been sought hereunder by such indemnified party, unless such settlement includes an unconditional release of such indemnified party from all liability on claims that are the subject matter of such proceeding.

(d) To the extent the indemnification provided for in Section 8(a) or 8(b) is unavailable to an indemnified party or insufficient in respect of any losses, claims, damages or liabilities referred to therein, then each indemnifying party under such Section in lieu of indemnifying such indemnified party thereunder, shall contribute to the amount paid or payable by such indemnified party as a result of such losses, claims, damages or liabilities (i) in such proportion as is appropriate to reflect the relative benefits received by the Company on the one hand and Morgan Stanley on the other hand from the offering of the Shares or (ii) if the allocation provided by clause 8(d)(i) above is not permitted by applicable law, in such proportion as is appropriate to reflect not only the relative benefits referred to in clause 8(d)(i) above but also the relative fault of the Company on the one hand and of Morgan Stanley on the other hand in connection with the statements or omissions that resulted in such losses, claims, damages or liabilities, as well as any other relevant equitable considerations. The relative fault of the Company on the one hand and Morgan Stanley on the other hand shall be determined by reference to, among other things, whether the untrue or alleged untrue statement of a material fact or the omission or alleged omission to state a material fact relates to information supplied by the Company or by Morgan Stanley and the parties’ relative intent, knowledge, access to information and opportunity to correct or prevent such statement or omission.

(e) The Company and Morgan Stanley agree that it would not be just or equitable if contribution pursuant to this Section 8 were determined by pro rata allocation or by any other method of allocation that does not take account of the equitable considerations referred to in Section 8(d). The amount paid or payable by an indemnified party as a result of the losses, claims, damages and liabilities referred to in the immediately preceding paragraph shall be deemed to include, subject to the limitations set forth above, any legal or other

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expenses reasonably incurred by such indemnified party in connection with investigating or defending any such action or claim. Notwithstanding the provisions of this Section 8, Morgan Stanley shall not be required to contribute any amount in excess of the amount by which the total price at which the Shares underwritten by it and distributed to the public were offered to the public exceeds the amount of any damages that Morgan Stanley has otherwise been required to pay by reason of such untrue or alleged untrue statement or omission or alleged omission. No person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall be entitled to contribution from any person who was not guilty of such fraudulent misrepresentation. The remedies provided for in this Section 8 are not exclusive and shall not limit any rights or remedies which may otherwise be available to any indemnified party at law or in equity.

(f) The indemnity and contribution provisions contained in this Section 8 and the representations, warranties and other statements of the Company contained in this Agreement shall remain operative and in full force and effect regardless of (i) any termination of this Agreement, (ii) any investigation made by or on behalf of Morgan Stanley or any person controlling Morgan Stanley or by or on behalf of the Company, its officers or directors or any person controlling the Company and (iii) acceptance of and payment for any of the Shares.

9. Termination. Morgan Stanley may terminate this Agreement by notice given by you to the Company, if, after the execution and delivery of this Agreement and prior to the Closing Date, (i) trading generally shall have been suspended or materially limited on, or by, as the case may be, any of the New York Stock Exchange, the American Stock Exchange, the Nasdaq National Market, the Chicago Board Options Exchange, the Chicago Mercantile Exchange or the Chicago Board of Trade, (ii) trading of any securities of the Company shall have been suspended on any exchange or in any over-the-counter market, (iii) a material disruption in securities settlement, payment or clearance services in the United States shall have occurred, (iv) any moratorium on commercial banking activities shall have been declared by Federal or New York State authorities or (v) there shall have occurred any outbreak or escalation of hostilities, or any change in financial markets or any calamity or crisis that, in your judgment, is material and adverse and that, singly or together with any other event specified in this clause (v), makes it, in your judgment, impracticable to proceed with the offer, sale or delivery of the Shares on the terms and in the manner contemplated in the Time of Sale Prospectus or the Prospectus.

10. Effectiveness; Defaults. This Agreement shall become effective upon the execution and delivery hereof by the parties hereto.

If this Agreement shall be terminated by Morgan Stanley because of any failure or refusal on the part of the Company to comply with the terms or to fulfill any of the conditions of this Agreement, or if for any reason the Company shall be unable to perform its obligations under this Agreement, the Company will reimburse Morgan Stanley for all documented out-of-pocket expenses (including the fees and disbursements of their counsel) reasonably incurred by Morgan Stanley in connection with this Agreement or the offering contemplated hereunder.

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11. Entire Agreement. (a) This Agreement, together with any contemporaneous written agreements and any prior written agreements (to the extent not superseded by this Agreement) that relate to the offering of the Shares, represents the entire agreement between the Company and Morgan Stanley with respect to the preparation of any preliminary prospectus, the Time of Sale Prospectus, the Prospectus, the conduct of the offering, and the purchase and sale of the Shares.

(b) The Company acknowledges that in connection with the offering of the Shares: (i) Morgan Stanley has acted at arm’s length, is not an agent of, and owes no fiduciary duties to, the Company or any other person, (ii) Morgan Stanley owes the Company only those duties and obligations set forth in this Agreement and prior written agreements (to the extent not superseded by this Agreement), if any, and (iii) Morgan Stanley’s interest may have interests that differ from those of the Company. The Company waives to the full extent permitted by applicable law any claims it may have against Morgan Stanley arising from an alleged breach of fiduciary duty in connection with the offering of the Securities.

12. Counterparts. This Agreement may be signed in two or more counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. Delivery of an executed counterpart of a signature page to this Agreement by facsimile shall be effective as delivery of a manually executed counterpart of this Agreement.

13. Applicable Law. This Agreement shall be governed by and construed in accordance with the internal laws of the State of New York.

14. Headings. The headings of the sections of this Agreement have been inserted for convenience of reference only and shall not be deemed a part of this Agreement.

15. Notices. All communications hereunder will be in writing and effective only on receipt, and, if sent to Morgan Stanley, will be mailed, delivered or telefaxed to Morgan Stanley & Co. Incorporated, Equity Capital Markets Syndicate Desk (fax no.: (212) 761 0316) and confirmed to Morgan Stanley & Co. Incorporated, Equity Capital Markets Syndicate Desk, 1585 Broadway, New York, New York 10036; or, if sent to the Company, will be mailed, delivered or telefaxed to (fax no.: (602) 244 5500) and confirmed to the General Counsel, ON Semiconductor Corporation, 5005 East McDowell Road, Phoenix, AZ 85008, attention of the Legal Department.

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Very truly yours,

ON SEMICONDUCTOR CORPORATION

By:		/s/ DONALD COLVIN
Name:		Donald Colvin
Title:		Chief Financial Officer


Accepted as of the date hereof:

MORGAN STANLEY & CO. INCORPORATED

By:		/s/ MIGUEL ESPINOSA
Name:		Miguel Espinosa
Title:		Executive Director

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SCHEDULE I

Time of Sale Prospectus

1.	Preliminary prospectus supplement dated April 6, 2006 relating to the Shares, including the Prospectus dated January 12, 2004 relating to the Shelf Securities

2.	The following information:

Issuer: ON Semiconductor Corporation

Symbol: ONNN

Size: $73,500,000

Shares offered: 10,500,000 shares

Greenshoe: 1,131,063 shares; option to purchase additional shares from ONNN

Price to public: $7.00 per share

Trade date: April 6, 2006

Closing date: April 12, 2006

Cusip: 682189105

Underwriter: Morgan Stanley & Co. Incorporated

I-1

SCHEDULE II

Officers and Directors of the Company Signing Lock-Up Agreements

Keith D. Jackson

Donald Colvin

George H. Cave

William George

William R. Bradford

Peter Green

J. Daniel McCranie

Curtis J. Crawford

Richard W. Boyce

Jerome N. Gregoire

John W. Marren

Justin T. Chang

Kevin R. Burns

Emmanuel T. Hernandez

Robert H. Smith

II-1

EXHIBIT A

[Form of Lockup Agreement for Directors and Certain Officers]

April , 2006

Morgan Stanley & Co. Incorporated

1585 Broadway

New York, New York 10036

Dear Sirs and Mesdames:

The undersigned understands that Morgan Stanley & Co. Incorporated (“Morgan Stanley”) proposes to enter into an Underwriting Agreement (the “Underwriting Agreement”) with ON Semiconductor Corporation, a Delaware corporation (the “Company”), providing for the public offering (the “Public Offering”) by Morgan Stanley of shares (the “Shares”) of the common stock, par value $0.01 per share, of the Company (the “Common Stock”).

To induce Morgan Stanley to continue its efforts in connection with the Public Offering, the undersigned hereby agrees that, without the prior written consent of Morgan Stanley, it will not, during the period commencing on the date hereof and ending 30 days after the date of the final prospectus relating to the Public Offering (the “Prospectus”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise. The foregoing sentence shall not apply to (a) transactions relating to shares of Common Stock or other securities acquired in open market transactions after the completion of the Public Offering, (b) transfers of shares of Common Stock or any security convertible into Common Stock as a bona fide gift or gifts, (c) transfers and dispositions between or among the undersigned, any of its affiliates and any partners, shareholders or members of any of the foregoing, (d) the sale of shares of Common Stock by directors or executive officers under existing plans or agreements entered into prior to the date hereof that establish plans meeting the requirements of Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), for the pre-arranged sale of shares of Common Stock, or (e) shares that the Company permits the individuals listed in Schedule II to the Purchase Agreement to sell pursuant to Section 2 of the Purchase Agreement, provided that in the case of any transfer, distribution or disposition pursuant to clause (b) or (c), (i) each donee,

distributee or disposition recipient shall execute and deliver to Morgan Stanley a duplicate form of this Lockup Letter and (ii) if a filing by any party (donor, donee, transferor, transferee, disposer or disposition recipient) under Section 16(a) of the Exchange Act, shall be required in connection with such transfer, distribution or disposition (other than a filing on a Form 5 made after the expiration of the 30-day period referred to above), such party shall provide Morgan Stanley no less than one day prior notice of such filing (it being understood that no such filing shall be made by any such party if not required to be made under the Exchange Act). In addition, the undersigned agrees that, without the prior written consent of Morgan Stanley, it will not, during the period commencing on the date hereof and ending 30 days after the date of the Prospectus, make any demand for or exercise any right with respect to, the registration of any shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock.

Whether or not the Public Offering actually occurs depends on a number of factors, including market conditions. Any Public Offering will only be made pursuant to an Underwriting Agreement, the terms of which are subject to negotiation between the Company and Morgan Stanley.

[The remainder of this page was intentionally left blank]

Delivery of an executed signature page to this letter by facsimile shall be effective as delivery of a manually executed signature page of this letter.

Very truly yours,

(Name)

(Address)

EXHIBIT B

[Form of Lock-up Agreement for TPG Semiconductor Holdings LLC and TPG ON Holdings LLC]

April , 2006

Morgan Stanley & Co. Incorporated

1585 Broadway

New York, New York 10036

Dear Sirs and Mesdames:

To induce Morgan Stanly to continue its efforts in connection with the Public Offering, the undersigned, on behalf of themselves, affiliates of the undersigned and any person in privity with the undersigned, hereby agrees that, without the prior written consent Morgan Stanley, it will not, during the period commencing on the date hereof and ending 30 days after the date of the final prospectus relating to the Public Offering (the “Prospectus”), (1) offer, pledge, sell, contract to sell, sell any option or contract to purchase, purchase any option or contract to sell, grant any option, right or warrant to purchase, lend, or otherwise transfer or dispose of, directly or indirectly, any shares of Common Stock or any securities convertible into or exercisable or exchangeable for Common Stock or (2) enter into any swap or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of the Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Common Stock or such other securities, in cash or otherwise. The foregoing sentence shall not apply to (a) transfers of shares of Common Stock or any security convertible into Common Stock as a bona fide gift or gifts, (b) distributions of shares of Common Stock or any security convertible into Common Stock to the partners, shareholders or members of the undersigned or its affiliates or (c) transfers and dispositions between or among the undersigned, any of its affiliates and any partners, shareholders or members of any of the foregoing, provided, that in the case of any transfer, distribution or disposition pursuant to clause (a), (b) or (c), (i) each donee, distributee or disposition recipient shall execute and deliver to Morgan Stanley a duplicate form of this Lock-up Letter and (ii) if a filing by any party (donor, donee, transferor, transferee, disposer or disposition recipient) under Section 16(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), shall be required in connection with such transfer, distribution or disposition (other than a filing on a Form 5

made after the expiration of the 30-day period referred to above), such party shall provide Morgan Stanley no less than one day prior notice of such filing (it being understood that no such filing shall be made by any such party if not required to be made under the Exchange Act). In addition, the undersigned agrees that, without the prior written consent of Morgan Stanley, it will not, during the period commencing on the date hereof and ending 30 days after the date of the Prospectus, make any demand for or exercise any right with respect to, the registration of any shares of Common Stock or any security convertible into or exercisable or exchangeable for Common Stock.

[The remainder of this page was intentionally left blank]

Delivery of an executed signature page to this letter by facsimile shall be effective as delivery of a manually executed signature page of this letter.


Very truly yours,

TPG ON HOLDINGS LLC

		by
		Name:
		Title:

Delivery of an executed signature page to this letter by facsimile shall be effective as delivery of a manually executed signature page of this letter.


Very truly yours,

TPG SEMICONDUCTOR HOLDINGS LLC

		by
		Name:
		Title:

News release

Exhibit 99.1

LOGO


Ross Ayotte		Ken Rizvi
Corporate Marketing		Investor Relations
ON Semiconductor		ON Semiconductor
(602) 244-5978		(602) 244-3437
ross.ayotte@onsemi.com		ken.rizvi@onsemi.com

ON Semiconductor Announces Offering of Common Stock

PHOENIX, Ariz. – April 6, 2006 – ON Semiconductor Corporation (Nasdaq: ONNN) today announced a proposed common stock offering of 10.5 million shares. These shares will be issued under ON Semiconductor’s existing shelf registration statement on file with the Securities and Exchange Commission.

In connection with the offering, ON Semiconductor proposes to grant the underwriter an option for a period of 30 days from the initial offering to purchase up to an additional 1.1 million shares of common stock to cover over-allotments, if any. ON Semiconductor plans to use the net proceeds from the offering to pay a portion of the purchase price for LSI Logic Corporation’s Gresham, Ore., wafer fabrication facility.

Morgan Stanley & Co. Incorporated is acting as sole underwriter for this offering. Copies of the preliminary prospectus related to the common stock offering may be obtained from Morgan Stanley & Co. Incorporated, Prospectus Department, 180 Varick Street, New York, NY 10014 (telephone no. 212-761-6775).

This news release does not constitute an offer to sell or a solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities law of any such jurisdiction. The common stock offering may be made only by means of a prospectus and related prospectus supplement, copies of which may be obtained by contacting Morgan Stanley as indicated in this news release.

About ON Semiconductor

With its global logistics network and portfolio of power semiconductor devices, ON Semiconductor (Nasdaq: ONNN) is a supplier of power solutions to engineers, purchasing professionals, distributors and contract manufacturers in the computer, cell phone, portable devices, automotive and industrial markets. For more information, please visit ON Semiconductor’s website at http://www.onsemi.com.

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ON Semiconductor and the ON Semiconductor logo are registered trademarks of Semiconductor Components Industries, LLC. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Although the company references its website in this news release, such information on the website is not to be incorporated herein.

This news release includes “forward-looking statements” as that term is defined in Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements other than statements of historical fact are statements that could be deemed forward-looking statements and are often characterized by the use of words such as “believes,” “expects,” “estimates,” “projects,” “may,” “will,” “intends,” “plans,” or “anticipates,” or by discussions of strategy, plans or intentions. In this news release, forward-looking information relates to the potential use of net proceeds and similar matters. All forward-looking statements in this news release are made based on management’s current expectations and estimates, which involve risks, uncertainties and other factors that could cause results to differ materially from those expressed in forward-looking statements. Among these factors are changes in overall economic conditions, the cyclical nature of the semiconductor industry, changes in demand for our products, changes in inventories at our customers and distributors, technological and product development risks, availability of raw materials, competitors’ actions, pricing and gross margin pressures, loss of key customers, order cancellations or reduced bookings, changes in manufacturing yields, control of costs and expenses, significant litigation, risks associated with acquisitions and dispositions, risks associated with our substantial leverage and restrictive covenants in our debt agreements, risks associated with our international operations, the threat or occurrence of international armed conflict and terrorist activities both in the United States and internationally, risks and costs associated with increased and new regulation of corporate governance and disclosure standards (including pursuant to Section 404 of the Sarbanes-Oxley Act of 2002), and risks involving environmental or other governmental regulation. Additional factors that could affect the company’s future operating results are in Item 1A Risk Factors of our Form 10-K for the year ended December 31, 2005 and other factors are described from time to time in our SEC filings. Readers are cautioned not to place undue reliance on forward-looking statements. We assume no obligation to update such information.

News release

Exhibit 99.2

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Ross Ayotte		Ken Rizvi
Corporate Marketing		Investor Relations
ON Semiconductor		ON Semiconductor
(602) 244-5978		(602) 244-3437
ross.ayotte@onsemi.com		ken.rizvi@onsemi.com

ON Semiconductor Announces Pricing of Common Stock

PHOENIX, Ariz. – April 6, 2006 – ON Semiconductor Corporation (Nasdaq: ONNN) today announced that it has priced a common stock offering of 10.5 million shares offered by the Company at a public offering price of $7.00 per share. The net proceeds to ON Semiconductor will be approximately $71 million. These securities will be issued under ON Semiconductor’s existing shelf registration statement on file with the Securities and Exchange Commission. The common stock is expected to be issued on Wednesday, April 12, 2006, subject to customary closing conditions.

In connection with the offering, ON Semiconductor granted the underwriter an option for a period of 30 days from the initial offering to purchase up to an additional 1.1 million shares of common stock to cover over-allotments, if any. ON Semiconductor plans to use the net proceeds from the offering to pay a portion of the purchase price for LSI Logic Corporation’s Gresham, Oregon wafer fabrication facility.

Morgan Stanley & Co. Incorporated is acting as sole underwriter for this offering. Copies of the prospectus related to the common stock offering may be obtained from Morgan Stanley & Co. Incorporated, Prospectus Department, 180 Varick Street, New York, NY 10014 (telephone no. 212-761-6775).

About ON Semiconductor

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