Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number SL1021A090X found under Arresterelectrical Surge by Littelfuse Inc. The National Stock Number assigned to this part is 5920016825806, and the Federal Supply Class is 5920 Fuses Arresters Absorbers And Protector. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like SL1021A090X.