This part is a kind of semiconductor called HY1606P.

Function of this product has N-Channel Enhancement Mode MOSFET.

Manufacturers : HOOYI

Image and pinout :

Some of the text within the PDF file :

HY1606P/B N-Channel Enhancement Mode MOSFET Features • 60V/66A RDS(ON) = 10.4 mΩ (typ.) @ VGS=10V • 100% avalanche tested • Reliable and Rugged • Lead Free and Green Devices Available (RoHS Compliant) Pin Description DS G TO-220FB-3L DS G TO-263-2L Applications • Switching application • Power Management for Inverter Systems. D G N-Channel MOSFET Ordering and Marking Information S PB HY1606 HY1606 YYÿ XXXJWW G YYÿ XXXJWW G Package Code P : TO-220FB-3L Date Code YYXXX WW B: TO-263-2L Assembly Material G : Lead Free Device Note: HOOYI lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with RoHS. HOOYI lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD [ ... ]

HY1606P PDF Datasheet Download