BUY 2SC5311 https://www.utsource.net/itm/p/11294728.html
2SC5311 NPN Transistors(BJT) SC-84 marking AC1
Description: NPN Epitaxial Planar Silicon Transistor
Features:
High DC Current Gain
High Transition Frequency
Low Collector-Emitter Saturation Voltage
Low Noise
High Reliability
Applications:
Audio Amplifier
High Frequency Amplifier
Switching Regulator
General Purpose Amplifier
(For reference only)