This part is a kind of semiconductor called 2SD1684.

Function of this product has Silicon NPN Power Transistor.

Manufacturers : Inchange Semiconductor

Image and pinout :

Some of the text within the PDF file :

INCHANGE Semiconductor isc Silicon NPN Power Transistor isc Product Specification 2SD1684 DESCRIPTION ··Low Collector Saturation Voltage : VCE(sat)= -0.5V(Max)@IC= -0.5A ·Wide Area of Safe Operation ·Complement to Type 2SB1144 APPLICATIONS ·Designed for 100V/1.5A Switching Applications ABSOLUTE MAXIMUM RATINGS(Ta=25℃) SYMBOL PARAMETER VALUE UNIT VCBO Collector-Base Voltage 120 V VCEO Collector-Emitter Voltage 100 V VEBO Emitter-Base Voltage 6V IC Collector Current-Continuous 1.5 A ICP Collector Current-Pulse Collector Power Dissipation @ TC=25℃ PC Collector Power Dissipation @ Ta=25℃ TJ Junction Temperature 2A 10 W 1.5 150 ℃ Tstg Storage Temperature Range -55~150 ℃ isc website：www.iscsemi.com 1 isc & iscsemi is registered trademark INCHANGE Semico [ ... ]

2SD1684 PDF Datasheet Download