Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 221-0001000025 found under Semiconductor Devic by Marathonnorco Aerospace Inc. The National Stock Number assigned to this part is 5961016017293, 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 221-0001000025.