This part is a kind of semiconductor called BU908.

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 BU908 DESCRIPTION ·With TO-3PN package ·High voltage ·High speed switching APPLICATIONS ·For color TV horizontal deflection circuits. PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter Fig.1 simplified outline (TO-3PN) and symbol DESCRIPTION Absolute maximum ratings (Ta=25 ) SYMBOL VCBO VCEO VEBO IC PT Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Total power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE 1500 700 7 8 125 150 -65~150 UNIT V V V A W THERMAL CHARACTERISTICS SYMBOL Rth j-c PARAMETER Thermal resistance junction case MAX 1.0 UNIT /W [ ... ]

BU908 PDF Datasheet Download