This part is a kind of semiconductor called C4131.
Function of this product has 2SC4131.
Manufacturers : Sanken
Image and pinout :
Some of the text within the PDF file :
2SC4131LOW VCE (sat) Silicon NPN Epitaxial Planar Transistor Application : DC-DC Converter, Emergency Lighting Inverter and General Purpose sAbsolute maximum ratings (Ta=25°C) Symbol 2SC4131 Unit VCBO 100 V VCEO VEBO IC IB PC Tj Tstg 50 15 15(Pulse25) 4 60(Tc=25°C) 150 –55 to +150 V V A A W °C °C sElectrical Characteristics Symbol Conditions ICBO IEBO V(BR)CEO hFE VCE(sat) VBE(sat) fT COB VCB=100V VEB=15V IC=25mA VCE=1V, IC=5A IC=5A, IB=80mA IC=5A, IB=80mA VCE=12V, IE=–1A VCB=10V, f=1MHz sTypical Switching Characteristics (Common Emitter) VCC RL IC VBB1 VBB2 IB1 (V) (Ω) (A) (V) (V) (A) 20 4 5 10 –5 0.08 IB2 (A) –0.08 ton (µs) 0.5typ (Ta=25°C) 2SC4131 10max 10max 50min Unit µA µA V 60 to 360 0.5max V 1.2max V 18typ MHz 210typ pF tstg [ ... ]