Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S1D13B1 found under Semiconductor Device Assembly by Sylvania Electric Products Inc. The National Stock Number assigned to this part is 5961001043497, and the Federal Supply Class is 5961 Semiconductor Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like S1D13B1.