Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C5257W found under Microcircuit Digital by Lansdale Semiconductor Inc. The National Stock Number assigned to this part is 5962002482630, 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 C5257W.