This part is a kind of semiconductor called BU2508AF.

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 BU2508AF DESCRIPTION ·With TO-3PFa package ·High voltage ·High speed switching APPLICATIONS ·For use in horizontal deflection circuit of colour TV receivers 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 CONDITIONS Open emitter Open base 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 CHARACTERI [ ... ]

BU2508AF PDF Datasheet Download