Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 539D943-1 found under Transistor by Bae Systems Controls Inc. The National Stock Number assigned to this part is 5961004768301, 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 539D943-1.