This part is a kind of semiconductor called 2SD478.

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 2SD478 DESCRIPTION ·With TO-220C package ·Complement to type 2SB568 APPLICATIONS ·Low frequency high voltage power amplifier TV vertical deflection output PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter DESCRIPTION Absolute maximum ratings(Ta=25 ) SYMBOL VCBO VCEO VEBO IC ICM PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-peak Ta=25 PC Collector power dissipation TC=25 Tj Tstg Junction temperature Storage temperature 30 150 -45~150 Open emitter Open base Open collector CONDITIONS VALUE 200 150 6 2 5 1.8 W UNIT V V V A A SavantIC Semiconductor Product Specification Silicon NPN Power Transistors CHA [ ... ]

2SD478 PDF Datasheet Download