This part is a kind of semiconductor called BU2508DF.

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 BU2508DF DESCRIPTION ·With TO-3PFa package ·High voltage,high speed ·Built-in damper diode APPLICATIONS ·For use in horizontal deflection circuits of colour TV PINNING PIN 1 2 3 Base Collector Emitter DESCRIPTION Absolute maximum ratings(Ta=25 ) SYMBOL VCBO VCEO IC ICM IB IBM Ptot Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Collector current (DC) Collector current (Pulse) Base Collector current (DC) Base current (Pulse) Total power dissipation Junction temperature Storage temperature TC=25 Open emitter Open base CONDITIONS VALUE 1500 700 8 15 4 6 45 150 -65~150 UNIT V V A A A A W SavantIC Semiconductor Product Specification Silicon NPN Power Transistors CHARACT [ ... ]

BU2508DF PDF Datasheet Download