Exhibit

We have acted as counsel to Power Integrations, Inc. (the “Company”), a Delaware corporation, and you have requested our opinion in connection with the filing of a registration statement on Form S‑8 (the “Registration Statement”) with the Securities and Exchange Commission covering the offering of up to 2,000,000 shares of the Company’s Common Stock, par value $0.001 per share (the “Shares”), including (i) 1,500,000 shares (the “2016 Plan Shares”) reserved for issuance pursuant to the Company’s 2016 Incentive Award Plan (the “2016 Plan”), and (ii) 500,000 shares (the “ESPP Shares”) reserved for issuance pursuant to the Company’s 1997 Employee Stock Purchase Plan (the “ESPP” and together with the 2016 Plan, the “Plans”).

In connection with this opinion, we have examined and relied upon the Registration Statement and related Prospectus included therein, the Company’s Amended and Restated Certificate of Incorporation and Bylaws, as currently in effect, the Plans and the originals or copies certified to our satisfaction of such other documents, records, certificates, memoranda and other instruments as we deem necessary or appropriate to enable us to render the opinion expressed below. We have assumed the genuineness and authenticity of all documents submitted to us as originals and the conformity to originals of all documents submitted to us as copies thereof.

On the basis of the foregoing, and in reliance thereon, we are of the opinion that the 2016 Plan Shares, when sold and issued in accordance with the 2016 Plan, and the ESPP Shares, when sold and issued in accordance with the ESPP, and in each case when sold and issued in accordance with the Registration Statement and related prospectuses, will be validly issued, fully paid, and nonassessable (except as to shares issued pursuant to certain deferred payment arrangements, which will be fully paid and nonassessable when such deferred payments are made in full).



By:	/s/ Timothy J. Moore
	Timothy J. Moore