BUY UA79GU1C https://www.utsource.net/itm/p/1351652.html
4-Terminal Adjustable Voltage Regulators
Description: The UA79GU1C is a high voltage fast-switching NPN power transistor from Fairchild Semiconductor. It is designed for use in switching applications such as DC-DC converters, motor control, and high voltage switching circuits. Features: High voltage capability: Vceo = 500V Low collector-emitter saturation voltage: Vce(sat) = 0.8V High switching speed: tF = 30ns Low collector-emitter leakage current: Ic(leakage) = 10μA TO-220 package Applications: DC-DC converters Motor control High voltage switching circuits (For reference only)