This part is a kind of semiconductor called 30N06G.

Function of this product has N-CHANNEL POWER MOSFET.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UNISONIC TECHNOLOGIES CO., LTD 30N06 60V, 30A N-CHANNEL POWER MOSFET  DESCRIPTION 1 TO-220F1 1 TO-220F2 1 TO-220 Power MOSFET 1 TO-220F The UTC 30N06 is a low voltage power MOSFET and is designed to have better characteristics, such as fast switching time, low gate charge, low on-state resistance and excellent avalanche characteristics. This power MOSFET is usually used at automotive applications in power supplies, high efficient DC to DC converters and battery operated products.  FEATURES 1 TO-251 1 TO- 252 * RDS(ON) = 40mΩ@VGS = 10 V, ID=15A * Ultra low gate charge ( typical 20nC ) * Low reverse transfer Capacitance ( CRSS = typical 80 pF ) * Fast switching capability * Avalanche energy specified * Improved dv/dt capability  SYMBOL  ORDERING INFORMATION Pin Assi [ ... ]

30N06G PDF Datasheet Download