This part is a kind of semiconductor called S2055N.

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 S2055N DESCRIPTION ·With TO-3P(H)IS package ·High voltage,high speed ·Low collector saturation voltage ·Built-in damper diode APPLICATIONS ·Color TV horizontal output applications ·Color TV switching regulator applications PINNING PIN 1 2 3 DESCRIPTION Base Collector Emitter Fig.1 simplified outline (TO-3P(H)IS) and symbol ABSOLUTE MAXIMUM RATINGS (TC=25 ) SYMBOL VCBO VCEO VEBO IC ICM 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 Open emitter Open base Open collector CONDITIONS VALUE 1500 700 5 8 15 4 50 150 -5 [ ... ]

S2055N PDF Datasheet Download