Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4WSD90TB found under Converter Digital To Analog by B And B Electronics Mfg Co. The National Stock Number assigned to this part is 7050016054693, and the Federal Supply Class is 7050 Adp Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4WSD90TB.