Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2S501 found under Transistor by British Sarozal Ltd. The National Stock Number assigned to this part is 5961004672755, 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 2S501.