This part is a kind of semiconductor called C4138.

Function of this product has 2SC4138.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

2SC4138 Silicon NPN Triple Diffused Planar Transistor (High Voltage and High Speed Switchihg Transistor) sAbsolute maximum ratings (Ta=25°C) Symbol VCBO VCEO VEBO IC IB PC Tj Tstg 2SC4138 500 400 10 10(Pulse20) 4 80(Tc=25°C) 150 –55 to +150 Unit V V V A A W °C °C Application : Switching Regulator and General Purpose 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 sElectrical Characteristics Symbol ICBO IEBO V(BR)CEO hFE VCE(sat) VBE(sat) fT COB Conditions VCB=500V VEB=10V IC=25mA VCE=4V, IC=6A IC=6A, IB=1.2A IC=6A, IB=1.2A VCE=12V, IE=–0.7A VCB=10V, f=1MHz 100max 100max 400min (Ta=25°C) 2SC4138 Unit µA µA 19.9±0.3 4.0 V V MHz pF 10 to 30 0.5max 1.3max 10typ 85typ V a b ø3.2±0.1 20.0min 4.0max 2 3 1.05 +0.2 -0. [ ... ]

C4138 PDF Datasheet Download