BUY 2N6673 https://www.utsource.net/itm/p/997520.html
HIGH VOLTAGE NPN TYPES FOR OFF LINE POWER SUPPLIES AND OTHER HIGH VOLTAGE SWITCHING APPLICATIONS
Description: The 2N6673 is a NPN Silicon Power Transistor designed for high voltage, high speed switching applications. Features: High voltage capability High speed switching Low saturation voltage Low collector-emitter saturation voltage Low collector-base capacitance Applications: High voltage switching High speed switching Motor control Power supplies Inverters (For reference only)