This part is a kind of semiconductor called C3890.
Function of this product has 2SC3890.
Manufacturers : Sanken electric
Image and pinout :
Some of the text within the PDF file :
2SC3890 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 2SC3890 500 400 10 7(Pulse14) 2 30(Tc=25°C) 150 –55 to +150 Unit V V V A A W °C °C Application : Switching Regulator and General Purpose External Dimensions FM20(TO220F) 4.0±0.2 10.1±0.2 4.2±0.2 2.8 c0.5 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=3A IC=3A, IB=0.6A IC=3A, IB=0.6A VCE=12V, IE=–0.5A VCB=10V, f=1MHz 100max 100max 400min 10 to 30 0.5max 1.3max 10typ 50typ (Ta=25°C) 2SC3890 Unit µA V V V MHz pF 13.0min 16.9±0.3 8.4±0.2 µA 1.35±0.15 1.35±0.15 0.85 +0.2 -0.1 0.45 +0.2 -0.1 2.54 2.2±0.2 2.4±0.2 [ ... ]