Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X1S0144A found under Transistor by Senior Operations Llc. The National Stock Number assigned to this part is 5961009491440, 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 X1S0144A.