Op amps with either input grounded have a fixed input capacitance parameter, CI, and this device has a 1.55nF @ 25V maximal input capacitance.To operate this transistor, you will need a 650V drain to source voltage (Vdss).A device like this reduces its overall power consumption when it uses drive voltage (10V).
R6520KNZC17 Features
a 650V drain to source voltage (Vdss)
R6520KNZC17 Applications
There are a lot of ROHM Semiconductor R6520KNZC17 applications of single MOSFETs transistors.
Synchronous Rectification for ATX 1 Server I Telecom PSU