Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1N4009 found under Semiconductor Device Diode by Itt Semiconductors Div. The National Stock Number assigned to this part is 5961007273562, 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 1N4009.