ON SEMICONDUCTOR CORP — Director's Dealing 2011

May 3, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2011-04-29

Reporting Person: JACKSON KEITH D (Director, CEO & Pres.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-04-29	Common	M	75000.0000	$7.0200	Acquired	970950.0000	Direct
2011-04-29	Common	S	60000.0000	$10.5200	Disposed	910950.0000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-04-29	Stock Option (right to buy)	$7.0200	M	75000.0000	Disposed	2014-02-05	Common (75000.0000)	Direct

Footnotes

F1: This transaction was made pursuant to the Reporting Person's existing Rule 10b5-1 plan (i.e. a stock trading plan designed to comply with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended).