This part is a kind of semiconductor called 2SC5241.
Function of this product has Silicon NPN Power Transistors.
Manufacturers : Inchange Semiconductor
Image and pinout :
Some of the text within the PDF file :
Inchange Semiconductor Product Specification Silicon NPN Power Transistors 2SC5241 DESCRIPTION ·With TO-220F package ·High voltage,high speed switching APPLICATIONS ·For switching regulator and general purpose applications PINNING PIN 1 2 3 Base Collector Fig.1 simplified outline (TO-220F) and symbol Emitter DESCRIPTION Absolute maximum ratings (Ta=25℃) SYMBOL VCBO VCEO VEBO IC ICM IB IBM PT Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-peak Base current Base current-peak Total power dissipation Junction temperature Storage temperature TC=25℃ Open emitter Open base Open collector CONDITIONS VALUE 600 450 7 5 10 2 4 30 150 -55~150 UNIT V V V A A A A W ℃ ℃ THERMAL CHARACTERISTICS SYMBOL Rth j-c PAR [ ... ]