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SEC FORM 4 SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 		 
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
Mahoney Robert Charles
(Last) (First) (Middle)
5005 EAST MCDOWELL ROAD
(Street)
PHOENIX AZ 85008
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
ON SEMICONDUCTOR CORP [ ONNN ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Exec VP Sales & Marketing
3. Date of Earliest Transaction (Month/Day/Year)
02/05/2007
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common 02/05/2007(1) M 4,375 A $1.25 24,375 D
Common 02/05/2007(1) S 4,375 D $9.56 20,000(2) D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Stock Option (right to buy) $1.25 02/05/2007(1) M 4,375 02/05/2004 02/05/2013 Common 4,375 $0 0 D
Explanation of Responses:
1. These transactions were made pursuant to the Reporting Person's existing Rule 10b5-1 plan (i.e., a stock trading plan designed to comply with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended). Option was originally granted effective February 5, 2003 under the Issuer's Stock Incentive Plan. Generally, the grant provides for pro rata vesting of 25% per year on each of the first through fourth anniversaries of the grant date. The exercise price was the closing price on the grant date.
2. This balance reflects 20,000 restricted stock units granted to the Reporting Person and previously reported on a Form 3 filed July 5, 2006. This amends the Table I, Column 5 balance previously reported on a subsequent Form 4 filed November 21, 2006.
Remarks:
Judith A. Boyle is signing on behalf of the Reporting Person pursuant to a Power of Attorney attached herein as an exhibit., mahoney2006poa.TXT
Judith A. Boyle, Attorney-in-Fact 02/07/2007
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
POWER OF ATTORNEY
(Robert Charles Mahoney)


	I hereby appoint Keith D. Jackson, George H. Cave and Judith A. Boyle, and each
  of
them, attorney-in-fact for me, each with full power of substitution, to prepare,
  execute and
deliver on my behalf reports required to be filed by me pursuant to Section 16
of the Securities
Exchange Act of 1934, as amended ("Section 16"), and Rule 144 and Rule 145 under
  the
Securities Act of 1933 (singly or collectively (?Rule 144?)), and any and all
related documents
and instruments.  Among other things, each attorney-in-fact is authorized to
file original reports
(either electronically or otherwise), signed by me or on my behalf, on Forms 3,
4 and 5, Form
144 with the Securities and Exchange Commission, any and all related documents
and
instruments, and to provide any necessary copies of such signed forms, documents
  and
instruments to The NASDAQ Stock Market and ON Semiconductor Corporation as
required by
the rules under Section 16 and Rule 144 as in effect from time to time.

	This power of attorney is effective from the date hereof until April 15, 2007,
unless earlier
revoked or terminated.


/s/ Robert Charles Mahoney
Robert Charles Mahoney


Dated:	June 29, 2006

G:\SECURITIES\Section 16\POA\2006 POA\Mahoney 2006 POA.doc