This part is a kind of semiconductor called 2SB645.

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 PNP Power Transistors 2SB645 DESCRIPTION ·With TO-3 package ·High power dissipation APPLICATIONS ·For power switching and general purpose applications PINNING(see Fig.2) PIN 1 2 3 Base Emitter Collector Fig.1 simplified outline (TO-3) and symbol DESCRIPTION Absolute maximum ratings(Ta= ) SYMBOL VCBO VCEO VEBO IC IB PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Collector power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE -200 -200 -5 -15 -5 150 150 -65~150 UNIT V V V A A W SavantIC Semiconductor Product Specification Silicon PNP Power Transistors [ ... ]

2SB645 PDF Datasheet Download