This part is a kind of semiconductor called C2120.

Function of this product has NPN Plastic Encapsulated Transistor.

Manufacturers : SeCoS

Image and pinout :

Some of the text within the PDF file :

Elektronische Bauelemente 2SC2120 0.8 A , 35 V NPN Plastic Encapsulated Transistor RoHS Compliant Product A suffix of “-C” specifies halogen & lead-free FEATURES High DC Current Gain Complementary to 2SA950 CLASSIFICATION OF hFE Product-Rank 2SC2120-O Range 100~200 2SC2120-Y 160~320 TO-92 GH J AD B K E CF 1Emitter 2Collector 3Base REF. A B C D E F G H J K Millimeter Min. Max. 4.40 4.70 4.30 4.70 12.70 - 3.30 3.81 0.36 0.56 0.36 0.51 1.27 TYP. 1.10 - 2.42 2.66 0.36 0.76 Collector 2 ABSOLUTE MAXIMUM RATINGS (TA = 25°C unless otherwise specified) Parameter Symbol Rating Collector to Base Voltage Collector to Emitter Voltage Emitter to Base Voltage Collector Current - Continuous Collector Power Dissipation Thermal Resistance From Junction to Ambient Junction [ ... ]

C2120 PDF Datasheet Download