This part is a kind of semiconductor called D798.

Function of this product has 2SD798.

Manufacturers : SavantIC

Image and pinout :

Some of the text within the PDF file :

www.DataSheet.co.kr SavantIC Semiconductor Product Specification Silicon NPN Power Transistors 2SD798 DESCRIPTION ·With TO-220 package ·High voltage ·DARLINGTON APPLICATIONS ·With switching and igniter applications PINNING PIN 1 2 3 Base Collector;connected to mounting base Emitter Fig.1 simplified outline (TO-220) and symbol DESCRIPTION Absolute maximum ratings(Ta=25 ) SYMBOL VCBO VCEO VEBO IC IB PC Tj Tstg PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Base current Collector power dissipation Junction temperature Storage temperature TC=25 CONDITIONS Open emitter Open base Open collector MAX 600 300 5 6 1 30 150 -55~150 UNIT V V V A A W Datasheet pdf - http://www.net/ www.DataSheet.co.kr Savan [ ... ]

D798 PDF Datasheet Download