Amendment Number Six to Wafer Supply Agreement, effective as of December 8, 2015, by Power Integrations International Ltd. and Seiko Epson Corporation

Exhibit 10.39

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[*] = Certain confidential information contained in this document, marked by brackets, is filed with the Securities and Exchange Commission pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

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AMENDMENT NUMBER SIX TO

WAFER SUPPLY AGREEMENT

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This Amendment Number Six (the “Amendment") effective as of December 8, 2015 (the “Amendment Effective Date”) amends the Wafer Supply Agreement effective April 1, 2005, as amended by Amendment number one effective December 19, 2008, Amendment number two effective September 13, 2010, Amendment number three effective February 1, 2012, Amendment number four effective April 1, 2015, and Amendment number five effective November 2, 2015 (as amended the “Agreement”) by and between:

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(1)       POWER INTEGRATIONS INTERNATIONAL LTD., a Cayman Islands corporation having a place of business at P.O. Box 219 Strathvale House, North Church Street, George Town, Grand Cayman, Cayman Islands ("Power Integrations")

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and

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(2)       SEIKO EPSON CORPORATION. a Japanese corporation having a place of business at 281 Fujimi, Fujimi-machi, Suwa-gun, Nagano-ken, 399-0293 Japan ("Seiko Epson").

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RECITALS

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WHEREAS, pursuant to the terms of the Agreement, Power Integrations grants to Seiko Epson licenses of certain of Power Integrations' intellectual property for the SOLE purpose of Power Integrations acquiring from Seiko Epson the fabrication and supply of wafers of certain power IC products; and

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WHEREAS, Power Integrations and Seiko Epson desire to amend the terms of the Agreement; and

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WHEREAS, in accordance with Section 18.10 of the Agreement, the Agreement may be amended only by an instrument in writing duly executed by authorized representatives of Seiko Epson and Power Integrations.

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Now, THEREFORE, in consideration of the mutual promises contained herein and other good and valuable consideration the receipt and sufficiency of which is hereby acknowledged, the parties hereby amend the Agreement as follows:

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AGREEMENT

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1.         Section 13.1 of the Agreement is deleted in its entirety and replaced with the following:

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13.1 This Agreement shall continue in full force and effect from the Effective Date until December 31, 2020, unless earlier terminated as provided herein (“Term”). After [ * ], Seiko Epson may terminate the Agreement without cause at its convenience upon providing [ * ] months prior written notice thereof to Power Integrations. If this Agreement has not been earlier terminated, the parties agree to negotiate in good faith, beginning one year prior to the end of the Term, for this Agreement's continuation for another [ * ] year period, on mutually agreeable terms and conditions.

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IN WITNESS WHEREOF, the parties have caused this Amendment to be executed by their duly authorized representatives, effective as of the Amendment Effective Date.

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