Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WS57C51C-55TMB found under Microcircuit Memory by Waferscale Integration Inc. The National Stock Number assigned to this part is 5962013934391, 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 WS57C51C-55TMB.