This part is a kind of semiconductor called 2SB1258.

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 2SB1258 DESCRIPTION ·With TO-220F package ·Complement to type 2SD1785 ·High DC current gain ·DARLINGTON APPLICATIONS ·Driver for solenoid ,relay and motor and general purpose PINNING PIN 1 2 3 Base Collector Emitter Fig.1 simplified outline (TO-220F) and symbol DESCRIPTION Absolute maximum ratings (Ta=25 ) SYMBOL VCBO VCEO VEBO IC ICM IB PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-peak Base current Collector power dissipation Junction temperature Storage temperature TC=25 Open emitter Open base Open collector CONDITIONS VALUE -100 -100 -6 -6 -10 -1 30 150 -55~150 UNIT V V V A A A W SavantIC Semiconductor [ ... ]

2SB1258 PDF Datasheet Download