This part is a kind of semiconductor called 3CA1837.

Function of this product has PNP TRANSISTOR.

Manufacturers : Jiangsu Changjiang Electronics

Image and pinout :

Some of the text within the PDF file :

JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD TO-220F 3CA1837 TRANSISTOR (PNP) Plastic-Encapsulate Transistors TO-220F FEATURES . High Transition Frequency : fT=70MHZ(Typ) . Complementary to 3DA4793 . Collector Power Dissipation PCM : 2W (Tamb=25℃) 20 W (Tcase=25℃) 1. BASE 2. COLLECTOR 3. EMITTE MAXIMUM RATINGS* TA=25℃ unless otherwise noted Symbol VCBO VCEO VEBO IC IB TJ Tstg Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current -Continuous Base Current Junction Junction Storage Junction Parameter Value -230 -230 -5 -1000 -100 150 -55-150 Units V V V mA mA ℃ ℃ *These ratings are limiting values above which the serviceability of any semiconductor device may be impaired. ELECTRICAL CHARACTERISTICS (Tamb=25℃ Parameter Collector-base br [ ... ]

3CA1837 PDF Datasheet Download