This part is a kind of semiconductor called 2SC1929.
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 2SC1929 DESCRIPTION ·With TO-220C package ·High VCEO ·Large PC APPLICATIONS ·AF output for direct main operation TV PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter DESCRIPTION Absolute maximum ratings (Tc=25 ) SYMBOL VCBO VCEO VEBO IC ICM PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-Peak Total power dissipation Junction temperature Storage temperature TC=25 Open emitter Open base Open collector CONDITIONS VALUE 300 300 6 0.4 1 25 150 -55~150 UNIT V V V A A W SavantIC Semiconductor Product Specification Silicon NPN Power Transistors CHARACTERISTICS Tj=25 unless othe [ ... ]
2SC1929 PDF Datasheet Download
