Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12156-005 found under Rectifier Semiconductor Device U by Bei Sensors And Systems Co Inc. The National Stock Number assigned to this part is 5961006173820, 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 12156-005.