Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 545B-OPT02 found under Counter Electronic Digital Reado by Phase Matrixinc. The National Stock Number assigned to this part is 6625015573973, 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 545B-OPT02.