Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KS19777L2 found under Transistor by Lucent Technologies Inc. The National Stock Number assigned to this part is 5961007662947, 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 KS19777L2.