This part is a kind of semiconductor called 2Sd1684.

Function of this product has PNP/NPN Epitaxial Planar Silicon Transistors.

Manufacturers : Sanyo Semicon Device

Image and pinout :

Some of the text within the PDF file :

Ordering number:2041A PNP/NPN Epitaxial Planar Silicon Transistors 2SB1144/2SD1684 100V/1.5A Switching Applications Features · Adoption of FBET and MBIT processes. · High breakdown voltage. · Low saturation voltage. · Plastic-covered heat sink facilitating high-density mounting. Package Dimensions unit:mm 2042B [2SB1144/2SD1684] ( ) : 2SB1144 1 : Emitter 2 : Collector 3 : Base Specifications Absolute Maximum Ratings at Ta = 25˚C Parameter Collector-to-Base Voltage Collector-to-Emitter Voltage Emitter-to-Base Voltage Collector Current Collector Current (Pulse) Collector Dissipation Symbol VCBO VCEO VEBO IC ICP PC Junction Temperature Storage Temperature Tj Tstg Tc=25˚C Conditions SANYO : TO-126ML Ratings (–)120 (–)100 (–)6 (–)1.5 (–)2.0 1.5 10 150 –55 to +15 [ ... ]

2Sd1684 PDF Datasheet Download