BUY BUX39 https://www.utsource.net/itm/p/1233737.html
HIGH CURRENT HIGH SPEED HIGH POWER SILICON NPN PLANAR TRANSISTOR
Package: TO-3 Manufacturer: ST Description: BUX39 is a NPN silicon power transistor manufactured by ST. Features: High DC current gain Low collector-emitter saturation voltage High collector-emitter voltage Low collector-emitter leakage current High switching speed Applications: BUX39 is suitable for use in applications such as switching regulators, converters, motor control circuits, and other high power switching applications. (For reference only)