Power of Attorney for Robert J. Willett

This filing is an exhibit, specifically a Power of Attorney, for Robert J. Willett, a director at Allegro MicroSystems, Inc. The document, dated May 4, 2026, grants power of attorney to Sharon Briansky, Matthew Frascella, Raymond Myer, Roald Webster, and Krista Bean. These individuals are authorized to act on behalf of Robert J. Willett regarding his holdings and transactions in Allegro MicroSystems, Inc. securities. Their responsibilities include preparing and executing necessary forms (Forms 3, 4, and 5) for SEC filings, managing the EDGAR account, and performing any other actions deemed beneficial or legally required. This Power of Attorney remains in effect until Mr. Willett is no longer required to file these forms, or until it is earlier revoked in writing.