This part is a kind of semiconductor called TIP127.
Function of this product has Darlington PNP Power Transistors.
Manufacturers : TAITRON
Image and pinout :
Some of the text within the PDF file :
Darlington Power Transistors (PNP) TIP125/126/127 Darlington Power Transistors (PNP) Features • Designed for general-purpose amplifier and low speed switching applications • RoHS Compliant Mechanical Data Case: Terminals: Weight: TO-220, Plastic Package Solderable per MIL-STD-202, Method 208 0.08 ounces, 2.24 grams TO-220 Maximum Ratings (T Ambient=25ºC unless noted otherwise) Symbol Description TIP125 VCBO VCEO VEBO IC ICM IB Collector-Base Voltage Collector-Emitter Voltage Emitter-Base Voltage Collector Current Continuous Collector Current Peak Base Current 60 60 Power Dissipation upto TC=25°C Power Dissipation Derate above TC=25°C PD Power Dissipation upto TA=25°C Power Dissipation Derate above TA=25°C RθJA RθJC TJ, TSTG Thermal Resistance from Junction to Am [ ... ]