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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

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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)

ON SEMICONDUCTOR (M/D A700)

5005 E. MCDOWELL ROAD

(Street)

PHOENIX

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)
Executive VP, Sales & Mktg.

3. Date of Earliest Transaction (Month/Day/Year)
07/03/2006

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)

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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Stock Options (right to buy)	$5.81	07/03/2006		A		33,000		07/03/2007⁽¹⁾	07/03/2016	Common Stock	33,000	$0	33,000	D

Explanation of Responses:

1. Granted effective July 3, 2006 under the Issuer's 2000 Stock Incentive Plan. Generally, the stock option will vest 25% on each of the first through fourth anniversaries of the grant date, subject to the terms and conditions of the 2000 Stock Incentive Plan and the related stock option agreement. The grant is for no consideration other than service as an officer of the Issuer, and the exercise price is the closing price on the grant date.

Remarks:

Judith A. Boyle is signing on behalf of the Reporting Person pursuant to a Power of Attorney attached herein as an exhibit.

	Robert Charles Mahoney by Judith A. Boyle as Attorney-in-Fact	07/05/2006
	** 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.

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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

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