Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MM6390D 256M found under Computer Subassembly by Micro Memory Inc. The National Stock Number assigned to this part is 7050014133973, and the Federal Supply Class is 7050 Adp Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MM6390D 256M.