Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5904-2SM found under Electronic Module Standardized by Synoptics Communications Inc. The National Stock Number assigned to this part is 5963014493921, and the Federal Supply Class is 5963 Electronic Modules. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5904-2SM.