The TIP122 is a NPN Darlington Power Transistor.  It can switch loads up to 60V with a peak current of 8A and continuous current of 5A. This makes it suitable for medium and high power electronics like controlling motors, solenoids or high power LEDs.

TECHNICAL DETAILS
Package: TO-220
Transistor Type: NPN
Current Rating: 5A
Peak Current Rating: 8A
Voltage Rating: 100V
RoHs: Yes