spice models

A bunch of .lib files can be found on this site:
https://www.elektronikschule.de/~krausg/Spice_Model_CD/
https://www.elektronikschule.de/~krau...ls-collection/
https://www.elektronikschule.de/~krau...Philips_Spice/
https://www.elektronikschule.de/~krau...otorola/Spice/
https://www.elektronikschule.de/~krau...%20List/Zetex/
https://www.elektronikschule.de/~krau...0List/Siemens/
https://www.elektronikschule.de/~krau...ls-collection/

IRF models: https://www.irf.com/product-info/models/spice/spice.zip

Most vendors provide spice models for their products, it's just a matter of searching. With the time your library will grow.

The way to include a model in your simulation is as follows. Let's assume I downloaded a file named pwrmos.lib which includes a model for the IRFP9240 which I'd like to use in my simulation.
1) I like to keep downloaded models in a separate directory, so I create a folder
c:\Program Files\LTC\LTwpiceIV\lib\sub\mylibs
ltspice is installed in c:\Program Files\LTC\LTwpiceIV on my computer, yours will be where ever you chose to install it

2) place the downloaded pwrmos.lib file in the created directory
c:\Program Files\LTC\LTwpiceIV\lib\sub\mylibs\pwrmos.lib

3) inside ltspice, include a spice directive by clicking on the .op button and then typing
.lib mylibs\pwrmos.lib
and place the directive on the screen next to your circuit

4) include a pmos component in your simulation if you have not done so yet, then while holding the Ctrl key pressed, righ-click on the component with the mouse. You will get a dialogue with a table of Attributes and Values. Chance the "Value" attribute by clicking on it, to IRFP9240. This is the name of the .model line in the file pwrmos.lib. Then press OK and you're done, you're using the right model. This works for models that come written as ".model ..... " There will be models which are written as ".subckt .... " and for those you have to change the "Prefix" attribute, and make it "X" . In general, when you download a .lib file, you need to look in it with a text editor such as notepad and find the model that you're looking for, see if it's a .subckt or a .model, and use it accordingly.

Hope this helps.