Equivalent to AO7400A MOSFET
The AON7400A is an N-channel MOSFET in 8-DFN-EP 3x3 package rated for an absolute maximum of 30V and 40A on the Drain and +-20V on the Gate, 20nC Gate charge at 10V, and &lt; 10.5m&ohm; resistance with 4.5V Gate drive. Any FET with similar specifications will probably work fine.

Many suppliers have 'parametric' filters that you can select a range of specifications from to narrow down the search for a suitable substitute. Here's an example result from Digikey:-