Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 899 1 R 221 found under Microcircuit Digita by Bi Technologies Corporation. The National Stock Number assigned to this part is 5962013011486, 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 899 1 R 221.