How to add the .net file provided by EPC for simulation

Hi,

Can you try below:

Open the .net file in Notepad or any text editor.
Look for a line that starts with
SUBCKT

Copy only the part from:
.SUBCKT EPC2204A ...
up to
.ENDS EPC2204A
Paste it into a new file and save as lib.
Add library under Simulation Settings → Library.
Link the .SUBCKT EPC2204A to your symbol using Associate PSpice Model.
Try this and let me know how it goes at your end.

The provided .net file seems to work for me. One thing that I did change was replace the "tab" characters in the original with single spaces and saved the modified file with a .lib file extension. (No changes to casing) Start Model Editor, open the new .lib file, File>Save and Export the LIB to a Capture .OLB. Place the created part in a PSpice schematic from the OLB, add a Design reference to the new .lib file in the Simulation Profile and run. The test circuit was trivial but the results looked fine. (Certainly no issues reading the model text)

EPC GaN models often have more than the standard 3 pins (G, D, S). They usually separate the temperature sensor pins or substrate pins.

Open the .lib file with Notepad.

Find the line .SUBCKT. Count how many connections are listed after the component name.

Solution: You need to create a new Symbol (.asy in LTspice) with the number and order of pins exactly matching the list in the .lib file. If you use the default nmos symbol (only 3 pins), the simulator will report an error due to missing connections.