This part is a kind of semiconductor called D2118.

Function of this product has NPN Plastic Encapsulated Transistor.

Manufacturers : SeCoS

Image and pinout :

Some of the text within the PDF file :

Elektronische Bauelemente 2SD2118 5A , 50V NPN Plastic Encapsulated Transistor RoHS Compliant Product A suffix of “-C” specifies halogen & lead-free FEATURES Low VCE(sat). VCE(sat) = 0.25V(Typ.) (IC/IB = 4A / 0.1A) Excellent DC Current Gain Characteristics D-Pack (TO-252) CLASSIFICATION OF hFE Product-Rank 2SD2118-Q Range 120~270 2SD2118-R 180~390 A BC D PACKAGE INFORMATION Package MPQ TO-252 2.5K Leader Size 13 inch Collector 2 1 Base 3 Emitter ABSOLUTE MAXIMUM RATINGS (TA=25°C unless otherwise specified) Parameter Symbol Ratings Collector to Base Voltage Collector to Emitter Voltage Emitter to Base Voltage Collector Current -Continuous Collector Power Dissipation Junction and Storage Temperature Range VCBO VCEO VEBO IC PC TJ ,TSTG 50 20 6 5 1 150 , -55~150 [ ... ]

D2118 PDF Datasheet Download