This part is a kind of semiconductor called 2SD1897.

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 2SD1897 DESCRIPTION ·With TO-220Fa package ·Low collector saturation voltage ·High power dissipation:PC=30W@TC=25 APPLICATIONS ·For low frequency power amplifier,power driver and DC-DC converter applications PINNING PIN 1 2 3 DESCRIPTION Base Collector Emitter Fig.1 simplified outline (TO-220Fa) and symbol Absolute maximum ratings(Ta=25 ) SYMBOL VCBO VCEO VEBO IC ICM PARAMETER Collector-base voltage Collector-emitter voltage Emitter-base voltage Collector current Collector current-Peak TC=25 PC Collector power dissipation Ta=25 Tj Tstg Junction temperature Storage temperature 2 150 -55~150 CONDITIONS Open emitter Open base Open collector VALUE 100 100 5 5 10 30 W UNIT V V V A A SavantI [ ... ]

2SD1897 PDF Datasheet Download