The STD65NF06 is a 60 V, 60 A N-channel power MOSFET from STMicroelectronics' STripFET™ II series, housed in a DPAK (TO-252-3) surface-mount package. Gate charge is 75 nC at 10 V.
For a new design you need a pin-compatible current-production N-channel MOSFET in DPAK with similar or better Rds(on) and gate charge — a 60 V trench device from the same or another vendor.
Package and reflow — DPAK realities
The DPAK (TO-252-3) is a common surface-mount power package with a large exposed tab that carries the drain current and dissipates heat.
