Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 54H21W C found under Microcircuit Digita by Rochester Electronicsllc. The National Stock Number assigned to this part is 5962003256123, 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 54H21W C.