Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X12ER1581 found under Semiconductor Devic by General Electric Inc. The National Stock Number assigned to this part is 5961004016787, 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 X12ER1581.