This part is a kind of semiconductor called MJL21193.

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 MJL21193 DESCRIPTION ·With TO-3PL package ·Complement to type MJL21194 ·Excellent gain linearity APPLICATIONS ·Designed for high power audio output,disk head positioners and linear applications PINNING PIN 1 2 3 Emitter Collector;connected to mounting base Base Fig.1 simplified outline (TO-3PL) and symbol DESCRIPTION ABSOLUTE MAXIMUM RATINGS(Tc=25 ) SYMBOL VCBO VCEO VEBO IC ICM IB PD Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-peak Base current Total power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector MAX -400 -250 -5 -16 -30 -5 200 -65~150 -65~15 [ ... ]

MJL21193 PDF Datasheet Download