Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RF303Y-12 found under Relay Electromagnetic by Teledyne Solid State Products. The National Stock Number assigned to this part is 5945015735129, and the Federal Supply Class is 5945 Relays And Solenoids. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RF303Y-12.