Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number HCT720A found under Transistor by Optek Technology Inc. The National Stock Number assigned to this part is 5961014190452, 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 HCT720A.