Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MR27C256-25 B found under Microcircuit Memory by Solid State Testing Inc. The National Stock Number assigned to this part is 5962013496973, and the Federal Supply Class is 5962 Microcircuits Electronic. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MR27C256-25 B.