Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3509S8-103 found under Resistor Variable W by Bourns Inc. The National Stock Number assigned to this part is 5905004635941, 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 3509S8-103.