This part is a kind of semiconductor called CEP20N06.
Function of this product has N-Channel Enhancement Mode Field Effect Transistor.
Manufacturers : CET
Image and pinout :

Some of the text within the PDF file :
CEP20N06/CEB20N06 N-Channel Enhancement Mode Field Effect Transistor FEATURES 60V, 25A, RDS(ON) =55mΩ @VGS = 10V. RDS(ON) =75mΩ @VGS = 4.5V. Super high dense cell design for extremely low RDS(ON). High power and current handing capability. Lead free product is acquired. TO-220 & TO-263 package. D D G S CEB SERIES TO-263(DD-PAK) G G D S CEP SERIES TO-220 S ABSOLUTE MAXIMUM RATINGS Parameter Drain-Source Voltage Gate-Source Voltage Drain Current-Continuous Drain Current-Pulsed a Tc = 25 C unless otherwise noted Symbol Limit VDS VGS ID IDM PD TJ,Tstg 60 Units V V A A W W/ C C ±20 25 70 83 0.56 -55 to 175 Maximum Power Dissipation @ TC = 25 C - Derate above 25 C Operating and Store Temperature Range Thermal Characteristics Parameter Thermal Resistance, Junction-to-Case Thermal Re [ ... ]
CEP20N06 PDF Datasheet Download
