This part is a kind of semiconductor called DFP70N06.
Function of this product has N-Channel MOSFET.
Manufacturers : DnI
Image and pinout :

Some of the text within the PDF file :
DFP70N06 N-Channel MOSFET Features Low RDS(on) (0.014 )@VGS=10V Low Gate Charge (Typical 70nC) Low Crss (Typical 160pF) Improved dv/dt Capability 100% Avalanche Tested Maximum Junction Temperature Range 2.Drain BVDSS = 60V 1.Gate 3.Source RDS(ON) = 0.014 ohm ID = 70A General Description This N-channel enhancement mode field-effect power transistor using DI semiconductor’s advanced planar stripe, DMOS technology intended for battery operated systems like a DC-DC converter motor control , ups ,audio amplifier. Also, especially designed to minimize rds(on) , low gate charge and high rugged avalanche characteristics. TO-220 1 2 3 Absolute Maximum Ratings Symbol VDSS ID IDM VGS EAS dv/dt PD TSTG, TJ TL Drain to Source Voltage Continuous Drain Current(@TC = 25°C) [ ... ]
DFP70N06 PDF Datasheet Download
