Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PS2503-4-A-ND found under Microcircuit Digital by California Eastern Labs. The National Stock Number assigned to this part is 5962015928123, 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 PS2503-4-A-ND.