This part is a kind of semiconductor called 55NF06.
Function of this product has N-CHANNEL POWER MOSFET TRANSISTOR.
Manufacturers : Thinki Semiconductor
Image and pinout :
Some of the text within the PDF file :
55NF06 ® Pb Free Plating Product 55NF06 Pb N-CHANNEL POWER MOSFET TRANSISTOR 50 AMPERE 60 VOLT N-CHANNEL POWER MOSFET DESCRIPTION 12 3 TO-251/IPAK Thinkisemi 50N06 is three-terminal silicon device with current conduction capability of about 50A, fast switching speed. Low on-state resistance, breakdown voltage rating of 60V, and max threshold voltages of 4 volt. It is mainly suitable electronic ballast, and low power switching mode power appliances. 12 3 TO-220/TO-220F FEATURES 12 3 TO-252/DPAK * RDS(ON) = 23mȍ@VGS = 10 V * Ultra low gate charge ( typical 30 nC ) * Low reverse transfer capacitance ( CRSS = typical 80 pF ) * Fast switching capability * 100% avalanche energy specified * Improved dv/dt capability SYMBOL U55NF06 P55NF06 F55NF06 D55NF06 TO-251/IPAK TO-2 [ ... ]