Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 398-421 found under Microcircuit Linear by Farnell Newark Electronics Component. The National Stock Number assigned to this part is 5962002231898, 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 398-421.