BUY MMBT4401 https://www.utsource.net/itm/p/873379.html
NPN General Purpose AmplifierNPN
Description: NPN General Purpose Amplifier Features: - Low collector-emitter saturation voltage - High current (max. 500 mA) - Low noise - High gain - High frequency - High power dissipation Applications: - Audio amplifiers - Switching circuits - Interface circuits - Driver circuits - Low-frequency amplifiers (For reference only)