If you have the model as a text file, you can bring it into your LTspice simulation by adding this line anywhere to the schematic:.lib filename.ext where filename.ext is the actual filename of the text (library) file. If that file is in the folder with the schematic, or in LTspice's cmp library folder (being careful to use the right one. An ICAP/4 product update. All current library files in the part database are shown in the list on the left of the New Model dialog. To save to a new library file, type a unique library name, then press the OK button. You can select an existing library file and keep on adding new models to the same library file. Locating the library directory. In case of Windows installation of LTspice XVII; usually the library directory is located inside of LTspice folder in 'My Documents' directory. After opening the LTspice folder you will have to open 'lib' folder. This directory represents the library location composed of 'cmp', 'sub' and 'sym' folders. Sound like the symbol is missing parameters needed with the CD4000.lib library file. Open the symbol and: 1. Add this to the 'Spiceline' field: VDD=5 SPEED=1.0 TRIPDT=5e-9 VDD sets the supply voltage. Change 5 to whatever voltage your circuit uses. Add this to the 'Spicemodel' field: VDD 0 This is for internal use by the library. LTspice IV supplies many device models to include discrete like transistors and MOSFET models. Nevertheless, there are also many third-party models from manufacturers that are available that you could add to your LTspice IV circuit simulations. These third-party SPICE models are described with a.MODEL and.SUBCKT statements.
Add To Library Lt Spices
Ltspice Add Library
Just last day I was searching all over the net to find out how this is done. In order for you to not have the trouble I went through, I am posting it here.
TRYING TO CREATE IRF540N from IRF540N.SPI
This is the process I have used to add .LIB files from ONsemi and .SPI files from IRF into my LTSPICE program.
In case of SPI file just rename it to a LIB file. Then place the LIB file in /SPICE/LIB/sub directory
Select a component file (with extension .asy) that looks like your new one from libsym
Lets say nmos.asy
(If you want to place the new component under a new category, create a new Directory here as CATEGORYNAME) and copy the file libsymnmos.asy to libsimCATEGORYNAMEIRF540N.asy
Open 1N5338B.asy in a text editor, and make the following changes:
* change SYMATTR Prefix D to SYMATTR Prefix X
(This says that the model we're using is a .subckt.)
* change SYMATTR Value D to SYMATTR Value IRF540N
(This says that the name that will show up on the schematic is IRF540N.)
* add a line SYMATTR ModelFile IRF540N.LIB
(This says that the name of the file containing the subcircuit we're using is 1N5338B.LIB.)
* add a line SYMATTR SpiceModel IRF540N
Restart LTSpice and you will have the component there.
DERIVED from what was found on this page : https://denethor.wlu.ca/ltspice/