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Put the model information into that file. "Mylib.lib") with the text editor of your choice. All you have to do is create your own library file (e.g. Instead of modifying the standard library, as described above, another technique is to save your own model(s) in a separate library. Therefore it is a good idea to keep a copy of your modified libraries in a separate directory and copy them back to the standard installation directory after an update of LTSPICE (of course, unless you like to practice the above method of adding models your libraries). The LTSPICE standard libraries may be deleted and replaced by new libraries every time you update LTSPICE. ​When in doubt about the correct format, look at the other models and copy from them. Just open the library again ("standard.bjt") and go to the model of the BCX70K. However, if that troubles you, you can easily add this information. This information is not crucial for simulation. You will (in this case) notice that the information about manufacturer, Vceo and Ic is missing for the QBCX70K. In the schematic editor, place an NPN transistor and pick a new model. If it makes you feel better, you can manually correct the formatting so that your new model looks exactly as the old models.ĭon't forget to save the library "standard.bjt" (the text file from step 1 may be discarded since it is no longer needed). Don't worry if the format looks different from what you already find in the library. In the editor, go to the end of the list and insert the model description that you saved in the first step. Just double-click on "standard.bjt" and open with LTSPICE (you may need to select from the open-with list in case the document type is not already associated with LTSPICE or open from within LTSPICE's file menu. Inserting the model can be done using a standard text editor or by using LTSPICE's built-in editor (my preferred method since it supports syntax highlighting). C:\program files\LTC\LTspiceIV, depending on your setup). This library is usually located in LTSPICE_home\lib\cmp where LTSPICE_home is the root directory of your LTSPICE installation (e.g. Since the BCX70k is a Bipolar Junction Transistor, the correct library is the "standard.BJT" (capitals by me to emphasize the correlation between library and type of component). Next insert the model into the fitting LTSPICE library (Note that the NXP model description is "QBCX70K", not BCX70K). Save the model as text file somewhere, it doesn't matter where as long as you can remember the place

Models are supplied by many manufacturers, we will use the one from NXP. Adding a new model to the LTSPICE library (example: BCX70K)įirst you need to get a suitable model.