Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MM1-8 390J found under Resistor Thermal by Microsemi Corporation. The National Stock Number assigned to this part is 5905004658177, and the Federal Supply Class is 5905 Resistors. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like MM1-8 390J.