This part is a kind of semiconductor called C1904.

Function of this product has 2SC1904.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

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

C1904 PDF Datasheet Download