Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U28-7701 found under Semiconductor Devic by Microsemi Corp Massachusetts. The National Stock Number assigned to this part is 5961013299537, 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 U28-7701.