Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MC1520B1BM found under Microcircuit Linear by Freescale Semiconductor. The National Stock Number assigned to this part is 5962010322018, 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 MC1520B1BM.