This part is a kind of semiconductor called C3171.
Function of this product has 2SC3171.
Manufacturers : SavantIC
Image and pinout :
Some of the text within the PDF file :
SavantIC Semiconductor wSwiwl.iDcatoaSnheeNt4PU.cNomPower Transistors DESCRIPTION ·With TO-3PFa package ·High collector current ·High speed switching APPLICATIONS ·For high speed switching applications PINNING(see Fig.2) PIN DESCRIPTION 1 Base 2 Collector 3 Emitter Product Specification 2SC3171 ABSOLUTE MAXIMUM RATINGS(Ta=25 ) SYMBOL PARAMETER CONDITIONS VCBO Collector-base voltage Open emitter VCEO Collector-emitter voltage Open base VEBO Emitter-base voltage Open collector IC Collector current ICP Collector current-peak IB Base current PC Collector power dissipation Tj Junction temperature Tstg Storage temperature TC=25 Ta=25 VALUE 500 400 7 10 20 5 100 3 150 -55~150 UNIT V V V A A A W SavantIC Semiconductor Silicon NPN Power Transistors CHAR [ ... ]