SEC FORM 3

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

KETTLEWELL THOMAS BENTON

(Last)

(First)

(Middle)

5005 EAST MCDOWELL ROAD

(Street)

PHOENIX

85008

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
02/22/2007

3. Issuer Name and Ticker or Trading Symbol
ON SEMICONDUCTOR CORP [ ONNN ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
X	Officer (give title below)	Other (specify below)
	SVP & GM Dig & Cons Prods Grp

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common	1,400	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Stock Option (right to buy)	08/18/2005⁽¹⁾	08/18/2014	Common	50,000	$3.55	D
Stock Option (right to buy)	03/08/2006⁽²⁾	03/08/2015	Common	20,000	$4.52	D
Stock Option (right to buy)	02/17/2006⁽³⁾	02/17/2015	Common	17,000	$4.8	D
Stock Option (right to buy)	03/23/2007⁽⁴⁾	03/23/2016	Common	23,300	$6.83	D

Explanation of Responses:

1. Granted on August 18, 2004 under the Issuer?s 2000 Stock Incentive Plan. The option is exercisable in four (4) equal installments on each of the first through fourth anniversaries of the Grant Date, subject to continued employment with the Issuer and other terms and conditions of the plan and the related stock option agreement.

2. Granted on March 8, 2005 under the Issuer?s 2000 Stock Incentive Plan. The option is exercisable in four (4) equal installments on each of the first through fourth anniversaries of the Grant Date, subject to continued employment with the Issuer and other terms and conditions of the plan and the related stock option agreement.

3. Granted on February 17, 2005 under the Issuer?s 2000 Stock Incentive Plan. The option is exercisable in four (4) equal installments on each of the first through fourth anniversaries of the Grant Date, subject to continued employment with the Issuer and other terms and conditions of the plan and the related stock option agreement.

4. Granted on March 23, 2006 under the Issuer?s 2000 Stock Incentive Plan. The option is exercisable in four (4) equal installments on each of the first through fourth anniversaries of the Grant Date, subject to continued employment with the Issuer and other terms and conditions of the plan and the related stock option agreement.

Remarks:

Judith A. Boyle is signing on behalf of the Reporting Person pursuant to a Power of Attorney attached herein as an exhibit., kettlewell2007poa.TXT

	Judith A. Boyle, Attorney-in-Fact	03/02/2007
	** 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 5 (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.
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