This part is a kind of semiconductor called B546.
Function of this product has 2SB546.
Manufacturers : NEC
Image and pinout :
Some of the text within the PDF file :
SavantIC Semiconductor Product Specification Silicon PNP Power Transistors 2SB546 DESCRIPTION ·With TO-220C package ·Complement to type 2SD401 ·Collector current IC=-2A ·Collector-base voltage VCBO=-200V www.DataSheet4U.com APPLICATIONS ·For use in general purpose power amplifier,vertical output application PINNING PIN 1 2 3 DESCRIPTION Emitter Collector;connected to mounting base Base Fig.1 simplified outline (TO-220) and symbol Absolute maximum ratings (Ta=25 ) SYMBOL VCBO VCEO VEBO IC PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE -200 -150 -5 -2 25 150 -55~150 UNIT V V V A W SavantIC S [ ... ]