This part is a kind of semiconductor called 2SD1409.

Function of this product has SILICON NPN DARLINGTON TRANSISTOR(GENERAL DESCRIPTION).

Manufacturers : Wing Shing Computer Components

Image and pinout :

Some of the text within the PDF file :

2SD1409 GENERAL DESCRIPTION SILICON NPN DARLINGTON TRANSISTOR Darington transistor are designed for use as general purpose amplifiers, switching and motor control applications. QUICK REFERENCE DATA SYMBOL TO-220F CONDITIONS VBE = 0V MIN VCESM VCEO IC ICM Ptot VCEsat Icsat VF tf PARAMETER Collector-emitter voltage peak value Collector-emitter voltage (open base) Collector current (DC) Collector current peak value Total power dissipation Collector-emitter saturation voltage Collector saturation current Diode forward voltage Fall time Tmb 25 IC = 4.0A; IB = 0.04A f=16KHZ IF=3A IC=4.0A,IB1=-IB2=0.04A,VCC=100V 2.5 MAX 600 400 6 12 25 2.0 5 6.0 UNIT V V A A W V A V s LIMITING VALUES SYMBOL VCESM VCEO IC ICM IB IBM Ptot Tstg Tj PARAMETER Collector-emitter voltage peak value Collector [ ... ]

2SD1409 PDF Datasheet Download