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* SMITH ROBERT HENRY (Last) (First) (Middle) 5005 EAST MCDOWELL ROAD (M/D A700) (Street) PHOENIX AZ 85008 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 08/18/2005	3. Issuer Name and Ticker or Trading Symbol ON SEMICONDUCTOR CORP [ ONNN ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)	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 Stock	90,000	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)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

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

	Robert H. Smith by Judith A. Boyle as Attorney-in-Fact	08/19/2005
	** 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
(Robert H. Smith)


	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")).  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, and Form 144 with the Securities and Exchange Commission,
and to provide any necessary copies of such signed forms 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, 2006, unless earlier
revoked or terminated.


						/s/ Robert H. Smith
						Robert H. Smith


Dated:	August 18, 2005






G:\SECURITIES\Section 16\POA\2005 POA\Smith 2005 POA.doc