Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 521 1623 1 found under Capacitor Fixed Plastic Dielectr by Electronic Associates Inc. The National Stock Number assigned to this part is 5910008900514, and the Federal Supply Class is 5910 Capacitors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 521 1623 1.