This part is a kind of semiconductor called B631.

Function of this product has 2SB631.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

SavantIC Semiconductor Product Specification Silicon PNP Power Transistors 2SB631 2SB631K DESCRIPTION ·With TO-126 package ·Complement to type 2SD600/K ·High breakdown voltage VCEO:-100/-120V ·High current: -1A ·Low saturation voltage,excellent hFE linearity APPLICATIONS ·For low-frequency power amplifier applications PINNING PIN 1 2 3 Emitter Collector;connected to mounting base Base DESCRIPTION Absolute maximum ratings(Ta=25 ) SYMBOL PARAMETER 2SB631 VCBO Collector-base voltage 2SB631K 2SB631 VCEO Collector-emitter voltage 2SB631K VEBO IC ICM Emitter-base voltage Collector current (DC) Collector current-Peak Ta=25 PD Total power dissipation TC=25 Tj Tstg Junction temperature Storage temperature 8 150 -55~150 Open collector Open base -120 [ ... ]

B631 PDF Datasheet Download