This part is a kind of semiconductor called C4020.

Function of this product has 2SC4020.

Manufacturers : Allegro Micro Systems

Image and pinout :

Some of the text within the PDF file :

2SC4020 Silicon NPN Triple Diffused Planar Transistor (High Voltage Switchihg Transistor) sAbsolute maximum ratings Symbol VCBO VCEO VEBO IC IB PC Tj 2SC4020 900 800 7 3(Pulse 6) 1.5 50(Tc=25°C) 150 –55 to +150 (Ta=25°C) Unit V V V A A W °C °C Application : Switching Regulator and General Purpose (Ta=25°C) 2SC4020 100max 100max 800min 10 to 30 0.5max 1.2max 6typ 40typ V MHz pF 2.5 B C E 12.0min 4.0max sElectrical Characteristics Symbol ICBO IEBO V(BR)CEO hFE VCE(sat) VBE(sat) fT COB Conditions VCB=800V VEB=7V IC=10mA VCE=4V, IC=0.7A IC=0.7A, IB=0.14A IC=0.7A, IB=0.14A VCE=12V, IE=–0.3A VCB=10V, f=1MHz External Dimensions MT-25(TO220) 3.0±0.2 10.2±0.2 4.8±0.2 2.0±0.1 Unit µA µA V 16.0±0.7 8.8±0.2 a b ø3.75±0.2 V 1.35 Tstg 0.65 +0.2 -0.1 2.5 [ ... ]

C4020 PDF Datasheet Download