Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2N4403 found under Transistor by Hewlett Packard Co. The National Stock Number assigned to this part is 5961001240117, 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 2N4403.