Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number RBEJ40E21-28 found under Jumper Special by R And B Electronics Inc. The National Stock Number assigned to this part is 1680016586361, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like RBEJ40E21-28.