BUY KST5551MTF https://www.utsource.net/itm/p/11275676.html
KST5551MTF NPN Transistors(BJT) 180V 600mA/0.6a 300MHz 80~250 200mV/0.2V SOT-23/SC-59 marking G1 amplifier
Description: NPN Bipolar Transistor Features: Low Collector-Emitter Saturation Voltage High DC Current Gain Low Noise High Switching Speed Low Collector-Emitter Leakage Current High Reliability High Voltage Applications: Audio Amplifiers Motor Control Switching Applications High Voltage Switching High Speed Switching (For reference only)