This part is a kind of semiconductor called 2SC5342S.

Function of this product has NPN Silicon Transistor (Medium power amplifier).

Manufacturers : AUK corp

Image and pinout :

Some of the text within the PDF file :

Semiconductor 2SC5342S NPN Silicon Transistor Description • Medium power amplifier Features • Large collector current : IC=500mA • Low collector saturation voltage enabling low-voltage operation • Complementary pair with 2SA1979S Ordering Information Type NO. 2SC5342S Marking BA : hFE rank Package Code SOT-23 Outline Dimensions unit : mm 2.3~2.5 1.2~1.4 1 1.90 Typ. 3 2 0.4 Typ. 0.45~0.60 0.2 Min. 1.12 Max. 0.094~0.174 0.38 2.8~3.0 PIN Connections 1. Base 2. Emitter 3. Collector KST-2036-002 0~0.1 1 2SC5342S Absolute maximum ratings Characteristic Collector-Base voltage Collector-Emitter voltage Emitter-Base voltage Collector current Collector dissipation Junction temperature Storage temperature (Ta=25°C) Symbol VCBO VCEO VEBO IC PC Tj Tstg Ratings 40 32 5 500 [ ... ]

2SC5342S PDF Datasheet Download