This part is a kind of semiconductor called MJL21194.

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 NPN Power Transistors MJL21194 DESCRIPTION ·With TO-3PL package ·Complement to type MJL21193 ·Excellent gain linearity APPLICATIONS ·Designed for high power audio output,disk head positioners and linear applications PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter DESCRIPTION Fig.1 simplified outline (TO-3PL) and symbol 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 -65~150 UNI [ ... ]

MJL21194 PDF Datasheet Download