Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 159-4 found under Rectifier Semiconductor Device U by Prj Equipment Co. The National Stock Number assigned to this part is 5961002485340, 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 159-4.