This part is a kind of semiconductor called 2SC3988.

Function of this product has SILICON POWER TRANSISTOR.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Product Specification Silicon NPN Power Transistors 2SC3988 DESCRIPTION ·With TO-3PN package ·High breakdown voltage high reliability. ·Wide area of safe operation ·Fast switching speed APPLICATIONS ·500V/25A switching regulator applications PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter DESCRIPTION Fig.1 simplified outline (TO-3PN) and symbol Absolute maximum ratings(Ta= ) SYMBOL VCBO VCEO VEBO IC ICP IB PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-peak Base current Collector power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE 800 500 7 25 40 8 150 150 -55~150 UNIT V [ ... ]

2SC3988 PDF Datasheet Download