This part is a kind of semiconductor called C4517A.
Function of this product has 2SC4517A.
Manufacturers : SavantIC
Image and pinout :
Some of the text within the PDF file :
Semiconductor Silicon NPN Power Transistors Product Specification 2SC4517 2SC4517A DESCRIPTION ·With TO-220F package ·High voltage switching transistor APPLICATIONS ·For switching regulator and general purpose applications PINNING PIN 1 2 3 DESCRIPTION Base Collector Emitter Fig.1 simplified outline (TO-220F) and symbol Absolute maximum ratings (Ta=25 ) SYMBOL PARAMETER CONDITIONS VCBO Collector-base voltage 2SC4517 2SC4517A Open emitter VCEO VEBO Collector-emitter voltage Emitter-base voltage Open base Open collector IC Collector current ICM Collector current-pulse IB Base current PC Collector power dissipation Tj Junction temperature Tstg Storage temperature TC=25 VALUE 900 1000 550 7 3 6 1.5 30 150 -55~150 UNIT V [ ... ]