Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AW20S-28-A-ER found under Nrp Pwrsup 28Vdc 20 by Abbott Technologies Inc. The National Stock Number assigned to this part is 1680016447203, 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 AW20S-28-A-ER.