Exhibit 32.1

Certification

Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906

of the Sarbanes-Oxley Act of 2002

For purposes of Section 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of ON Semiconductor Corporation, a Delaware corporation (“Company”), does hereby certify, to such officer’s knowledge, that:

The Quarterly Report on Form 10-Q for the fiscal quarter ended September 28, 2012 (“Form 10-Q”) of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in the Form10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated: November 1, 2012	/s/ KEITH D. JACKSON
	Keith D. Jackson
	President and Chief Executive Officer
Dated: November 1, 2012	/s/ BERNARD GUTMANN
	Bernard Gutmann
	Executive Vice President and
	Chief Financial Officer