BUY TZM5242B-GS08 https://www.utsource.net/itm/p/5336516.html
Small Signal Zener Diodes
Description: The TZM5242B-GS08 is a high-voltage, high-speed, NPN silicon power transistor in a SOD-80 package. Features: High-voltage capability: VCEO = 600 V High-speed switching: tF = 0.2 μs Low collector-emitter saturation voltage: VCE(sat) = 0.3 V Low collector-emitter leakage current: ICES = 1 μA Low collector-base leakage current: ICBO = 1 μA Applications: High-voltage switching Motor control Lighting control Power supplies (For reference only)