Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NO PRIMARY REF 12 168 1658 found under Transistor by This Ncage Is Used To Inform That. The National Stock Number assigned to this part is 5961121681658, and the Federal Supply Class is 5961 Semiconductor Devices And Associated Hardware. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like NO PRIMARY REF 12 168 1658.