ON SEMICONDUCTOR CORP — Director's Dealing 2011

Jan 11, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ON SEMICONDUCTOR CORP (ONNN)
CIK: 0001097864
Period of Report: 2011-01-07

Reporting Person: COLVIN DONALD A (Exec VP & CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-01-07	Common	M	20000.0000	$4.8000	Acquired	567661.0000	Direct
2011-01-07	Common	S	20000.0000	$10.5300	Disposed	547661.0000	Direct
2011-01-10	Common	M	60200.0000	$7.0200	Acquired	607861.0000	Direct
2011-01-10	Common	S	60200.0000	$11.0000	Disposed	547661.0000	Direct
2011-01-11	Common	M	14800.0000	$7.0200	Acquired	562461.0000	Direct
2011-01-11	Common	S	14800.0000	$11.0000	Disposed	547661.0000	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-01-07	Stock Option (right to buy)	$4.8000	M	20000.0000	Disposed	2015-02-17	Common (20000.0000)	Direct
2011-01-10	Stock Option (right to buy)	$7.0200	M	60200.0000	Disposed	2014-02-05	Common (60200.0000)	Direct
2011-01-11	Stock Option (right to buy)	$7.0200	M	14800.0000	Disposed	2014-02-05	Common (14800.0000)	Direct

Footnotes

F1: These transactions were 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).