BUY 2SC1621 https://www.utsource.net/itm/p/11275616.html
2SC1621 NPN Transistors(BJT) 40V 200mA/0.2A 500MHz 40~80 250mV/0.25V SOT-23/SC-59 marking B2 fast switch
Description: NPN Silicon Epitaxial Planar Transistor Features: - Low collector-emitter saturation voltage - High current gain - High switching speed - Low noise Applications: - Audio frequency amplifier - Low frequency amplifier - High frequency amplifier - High speed switching (For reference only)