This part is a kind of semiconductor called C3831.

Function of this product has 2SC3831.

Manufacturers : Sanken electric

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Some of the text within the PDF file :

2SC3831 Silicon NPN Triple Diffused Planar Transistor (High Voltage and High Speed Switching Transistor) sAbsolute maximum ratings (Ta=25°C) Symbol VCBO VCEO VEBO IC IB PC Tj Tstg 2SC3831 600 500 10 10(Pulse20) 4 100(Tc=25°C) 150 –55 to +150 Unit V V V A A W °C °C Application : Switching Regulator and General Purpose sElectrical Characteristics Symbol ICBO IEBO V(BR)CEO hFE VCE(sat) VBE(sat) fT COB Conditions VCB=600V VEB=10V IC=25mA VCE=4V, IC=5A IC=5A, IB=1A IC=5A, IB=1A VCE=12V, IE=–1A VCB=10V, f=1MHz 1max 100max 500min 10 to 30 0.5max 1 . 3 max 8typ 105typ (Ta=25°C) 2SC3831 Unit External Dimensions MT-100(TO3P) 5.0±0.2 15.6±0.4 9.6 2.0 1.8 4.8±0.2 2.0±0.1 mA µA 4.0 V V MHz pF 19.9±0.3 a b ø3.2±0.1 20.0min 4.0max V 2 3 1.05 +0.2 -0.1 0.65 +0.2 -0.1 1.4 sT [ ... ]

C3831 PDF Datasheet Download