This part is a kind of semiconductor called BD249C.

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 BD249/A/B/C DESCRIPTION ·With TO-3PN package ·Complement to type BD250/A/B/C ·125 W at 25°C case temperature ·25 A continuous collector current 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 PARAMETER BD249 VCEO Collector-emitter voltage BD249A BD249B BD249C BD249 VCBO Collector-base voltage BD249A BD249B BD249C 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 Open collector Open base Open base CONDITIONS VALUE 45 60 80 100 55 70 90 115 5 25 40 [ ... ]

BD249C PDF Datasheet Download