Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RK73B1JLTD221J found under Resistor Chip Fixed by Koa Speer Electronics Inc. The National Stock Number assigned to this part is 5905015777471, 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 RK73B1JLTD221J.