Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number UC1903J 883B found under Microcircuit Linear by Spectrum Microwave Inc. The National Stock Number assigned to this part is 5962013267708, 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 UC1903J 883B.