Exhibit 16.1

March 26, 2013

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Commissioners:

We have read the statements made by Micrel, Incorporated (copy attached), which we understand will be filed with the Securities and Exchange Commission, pursuant to Item 4.01 of Form 8-K, as part of the Form 8-K of Micrel, Incorporated dated March 21, 2013. We agree with the statements concerning our Firm in such Form 8-K.

Very truly yours,

/s/PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP

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PricewaterhouseCoopers LLP, 488 Almaden Boulevard, Suite 1800, San Jose, CA 95110

T: (408) 817 7830, F: (408) 817 5050, www.pwc.com/us