This part is a kind of semiconductor called TIP122.

Function of this product has NPN Transistor.

Manufacturers : JCET

Image and pinout :

Some of the text within the PDF file :

JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD TO-220-3L Plastic-Encapsulate Transistors TIP120,121,122 Darlington TRANSISTOR (NPN) TIP125,126,127 Darlington TRANSISTOR (PNP) FEATURES Medium Power Complementary Silicon Transistors TO-220-3L 1.BASE 2.COLLECTOR 3.EMITTER MAXIMUM RATINGS (Ta=25℃ unless otherwise noted) Symbol Parameter VCBO VCEO VEBO IC PC RθJA RθJc TJ Tstg Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current -Continuous Collector Power Dissipation Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case Junction Temperature Storage Temperature TIP120 TIP125 60 60 TIP121 TIP126 80 80 5 5 2 62.5 1.92 150 -55to+150 TIP122 TIP127 100 100 ELECTRICAL CHARACTERISTICS (Ta=25℃ unless otherwise specified) Param [ ... ]

TIP122 PDF Datasheet Download