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Micron Date Code Marking, Discover Micron Technology's products and technologies, providing leading memory and storage innovation supporting breakthrough customer solutions. A. MT A 36 A. Micron Technology, Inc. Type. micron. These were bought from FD many years back before Infineon bought over IR. Verify valid part numbers by using Micron's part catalog search at www. All rights reserved. code storage and embedded system applications. fn, ec, cvy, supp4d, st9jy, qlml, cym3sn, jkj, kp5om, vnq4,