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* Schromm William A. (Last) (First) (Middle) ON SEMICONDUCTOR (M/D A700) 5005 E. MCDOWELL ROAD (Street) PHOENIX AZ 85008 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 05/25/2006	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, Computing Prods Grp	5. If Amendment, Date of Original Filed (Month/Day/Year) 05/31/2006
			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)

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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	09/09/1999	09/09/2009	Common Stock	9,000(1)	1.5	D
Stock Option (right to buy)	07/17/2003	07/17/2012	Common Stock	41,000(1)	2.71	D
Stock Option (right to buy)	02/05/2004	02/05/2013	Common Stock	5,500(1)	1.25	D

Explanation of Responses:

1. On May 31, 2006, the Reporting Person filed a Form 3 that had incorrect number of shares listed in the "Amount or Number of Shares" column of Table II of the form. This amended Form 3 includes the correct numbers.

Remarks:

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

	Judith A. Boyle, as Attorney-in-Fact	07/13/2006
	** 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 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.
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
(William A. Schromm)


	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/ William A. Schromm
William A. Schromm


Dated:	May 22, 2006


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