This part is a kind of semiconductor called BD204.

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 PNP Power Transistors BD204 · DESCRIPTION ·With TO-220C package ·Low saturation voltage ·Complement to type BD203 ·Wide area of safe operation APPLICATIONS ·For medium power switching and amplifier applications PINNING PIN 1 2 3 DESCRIPTION Emitter Collector;connected to mounting base Base Absolute maximum ratings (Ta=25 ) SYMBOL VCBO VCEO VEBO IC ICM IB PT Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter -base voltage Collector current (DC) Collector current-Peak Base current Total power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE -60 -60 -5 -8 -12 -3 60 150 -65~150 UNIT V V V A A A W THERMAL CHARACTERISTICS S [ ... ]

BD204 PDF Datasheet Download