Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EXC-1553PCI EPM found under Circuit Card Assemb by Excalibur Systems Inc. The National Stock Number assigned to this part is 4920014945262, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like EXC-1553PCI EPM.