Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M221F149-0305-11 found under Switch Thermostatic by Texas Instruments Incorporated. The National Stock Number assigned to this part is 5930009800401, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like M221F149-0305-11.