This part is a kind of semiconductor called 2SC1904.

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 2SC1904 DESCRIPTION ·With TO-126 package ·Complement to type 2SA899 APPLICATIONS ·For high frequency power amplification PINNING PIN 1 2 3 Emitter Collector;connected to mounting base Base DESCRIPTION Absolute maximum ratings(Ta=25 ) SYMBOL VCBO VCEO VEBO IC PD Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current (DC) Total power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector VALUE 150 150 5 50mA 1 150 -55~150 UNIT V V V A W SavantIC Semiconductor Product Specification Silicon NPN Power Transistors CHARACTERISTICS Tj=25 unless otherwise specified PARAMET [ ... ]

2SC1904 PDF Datasheet Download