This is one of the semiconductor types. This part name is SVF4N65F.
This product has 650V N-channel enhancement mode MOSFET functions.
Manufacturers of product is SL.
Image and pinout :
SVF4N65F PDF Datasheet
Some of the text files within the PDF file
SVF4N65F is an N-channel enhancement mode power MOS field effect transistor which is produced using Silan proprietary F-CellTM structure VDMOS technology. The improved planar stripe cell and the improved guard ring terminal have been especially tailored to minimize on-state resistance, provide superior switching performance, and withstand high energy pulse in the avalanche and commutation mode.
These devices are widely used in AC-DC power suppliers, DCDC converters and H-bridge PWM motor drivers. [ … ]
Please refer to the file for details.