Attached files

file filename
EX-10.5 - EX-10.5 - POWER ONE INCa2203998zex-10_5.htm
EX-10.2 - EX-10.2 - POWER ONE INCa2203998zex-10_2.htm
EX-31.1 - EX-31.1 - POWER ONE INCa2203998zex-31_1.htm
EX-10.4 - EX-10.4 - POWER ONE INCa2203998zex-10_4.htm
EX-31.2 - EX-31.2 - POWER ONE INCa2203998zex-31_2.htm
EX-10.3 - EX-10.3 - POWER ONE INCa2203998zex-10_3.htm
EX-10.6 - EX-10.6 - POWER ONE INCa2203998zex-10_6.htm
10-Q - 10-Q - POWER ONE INCa2203998z10-q.htm

QuickLinks -- Click here to rapidly navigate through this document


Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER AND
PRINCIPAL FINANCIAL OFFICER PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

        We, Richard J. Thompson, President and Chief Executive Officer, and Gary R. Larsen, Senior Vice President, Finance, and Chief Financial Officer of Power-One, Inc. (the "Company"), do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to our knowledge:

    (i)
    the Quarterly Report on Form 10-Q of the Company for the fiscal quarter ended April 3, 2011, as filed with the Securities and Exchange Commission (the "Report"), fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934; and

    (ii)
    the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 10, 2011    

/s/ RICHARD J. THOMPSON

Richard J. Thompson
President and Chief Executive Officer
(Principal Executive Officer)

 

 

/s/ GARY R. LARSEN

Gary R. Larsen
Senior Vice President, Finance, and
Chief Financial Officer
(Principal Financial Officer)

 

 



QuickLinks