This part is a kind of semiconductor called BU2527DX.

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 BU2527DX DESCRIPTION ·With TO-3PML package ·High voltage ·High speed switching ·Built-in damper diode APPLICATIONS ·For use in horizontal deflection circuits of high resolution monitors 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 ICM IB IBM Ptot Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current (DC) Collector current -peak Base current (DC) Base current -peak Total power dissipation Junction temperature Storage temperature TC=25 Open emitter Open base Open collector CONDITIONS VALUE 1500 800 7.5 12 30 8 12 45 150 -65~15 [ ... ]

BU2527DX PDF Datasheet Download