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*
NELSON WILLIAM JOHN

(Last) (First) (Middle)
5005 EAST MCDOWELL ROAD

(Street)
PHOENIX AZ 85008

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
05/01/2007
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)
Exec VP & COO
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)
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:
Judith A. Boyle is signing on behalf of the Reporting Person pursuant to a Power of Attorney attached herein as an exhibit., nelson2007poa.TXT
No securities are beneficially owned.
Judith A. Boyle, Attorney-in-Fact 05/04/2007
** 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.
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
(W. John Nelson)


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, 2008,
unless earlier
revoked or terminated.


/s/ W. JOHN NELSON
W. John Nelson


Dated:	May 1, 2007


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