Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U74LS393 found under Microcircuit Digita by Drs Rugged Systems Europe Ltd. The National Stock Number assigned to this part is 5962010910557, and the Federal Supply Class is 5962 Microcircuits Electronic. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like U74LS393.