This part is a kind of semiconductor called HRF120N10K.

Function of this product has N-Channel MOSFET.

Manufacturers : SemiHow

Image and pinout :

Some of the text within the PDF file :

HRF120N10K HRF120N10K 100V N-Channel Trench MOSFET FEATURES  BVDSS = 100 V  ID = 73 A  Unrivalled Gate Charge : 65 nC (Typ.)  Lower RDS(ON) : 10 mΩ (Typ.) @VGS=10V  100% Avalanche Tested December 2014 8DFN 5x6 1 Absolute Maximum Ratings TC=25℃ unless otherwise specified Symbol Parameter Value VDSS ID IDM VGS EAS EAR PD TJ, TSTG TL Drain-Source Voltage Drain Current Drain Current Drain Current – Continuous (TC = 25℃) – Continuous (TC = 100℃) – Pulsed (Note 1) Gate-Source Voltage Single Pulsed Avalanche Energy (Note 2) Repetitive Avalanche Energy (Note 1) Power Dissipation (TC = 25℃) Power Dissipation (TA = 25℃) Operating and Storage Temperature Range Maximum lead temperature for soldering purposes, 1/8” from case for 5 seconds 100 73 * [ ... ]

HRF120N10K PDF Datasheet Download