Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SM-678B found under Microcircuit Linear by Rf Micro Inc. The National Stock Number assigned to this part is 5962011265194, 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 SM-678B.