Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2544D found under by Spectrum Microwave Inc Div Spec. The National Stock Number assigned to this part is 5820001687696, and the Federal Supply Class is 5820 Radio And Television Communication Equipment Except Airborne. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2544D.