Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number REI54S189J B found under Microcircuit Memory by Rochester Electronicsllc. The National Stock Number assigned to this part is 5962011025314, 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 REI54S189J B.