This part is a kind of semiconductor called BD743.

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 DESCRIPTION ·With TO-220C package ·Complement to type BD744/A/B/C ·High current capability ·High power dissipation APPLICATIONS ·For use in power linear and switching applications PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter DESCRIPTION BD743/A/B/C Absolute maximum ratings (Ta=25 ) SYMBOL PARAMETER BD743 VCBO Collector-base voltage BD743A BD743B BD743C BD743 VCEO Collector-emitter voltage BD743A BD743B BD743C VEBO IC ICM IB PC Tj Tstg Emitter-base voltage Collector current Collector current-peak Base current Collector power dissipation Junction temperature Storage temperature TC=25 Ta=25 Open collector Open base Open emitter CONDITIONS VALUE 50 70 90 110 45 60 80 1 [ ... ]

BD743 PDF Datasheet Download