Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RC555NB found under Microcircuit Linear by Raytheon Technical Services Company. The National Stock Number assigned to this part is 5962002770391, 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 RC555NB.