This part is a kind of semiconductor called BU508AFI.

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 BU508AFI DESCRIPTION ·With TO-3PML package ·High voltage ·High speed switching APPLICATIONS ·For use in horizontal deflection of colour TV receivers PINNING PIN 1 2 3 Base Collector Emitter Fig.1 simplified outline (TO-3PML) and symbol DESCRIPTION Absolute maximum ratings(Ta=25 ) SYMBOL VCBO VCEO VEBO IC ICP Ptot Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current (DC) Collector current (Pulse) Total power dissipation Max.operating junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE 1500 700 10 8 15 50 150 -65~150 UNIT V V V A A W THERMAL CHARACTERISTICS SYMBOL Rth j-c PARAMETER Ther [ ... ]

BU508AFI PDF Datasheet Download