Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SC A4 90403 found under Semiconductor Device Diode by Babcock Inc. The National Stock Number assigned to this part is 5961010710320, and the Federal Supply Class is 5961 Semiconductor Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SC A4 90403.