Hello,
I have tried to add the schottky diode(spice model from onsem) as you can see on the schematics on LTspice but I keep getting the same errors and I have watched the intro from this link : Adding Third-Party Models to LTspice IV but I still get this error

I have saved the same schematics on the same folder as the

what did I do wrong?

 

hi Tarik,
Please post your LTspice asc file.
E

BTW: post the model data.

 

hi Tarik,
Please post your LTspice asc file.
E

BTW: post the model data.

Hi Eric,
It is done on Schottky.zip

 

Your .inc command has a double .LIB file extension. That probably confuses LTS.

 

Your .inc command has a double .LIB file extension. That probably confuses LTS.

it is the same without .LIB in the end.

 

hi tarik,
I have same problem.
The model file looks incomplete, where did you get the download?
E

 

hi tarik,
I have same problem.
The model file looks incomplete, where did you get the download?
E

here https://www.onsemi.com/design/resources/design-resources/models?rpn=MBRA340
actually I saved it as txt and seems showing some results but not certain if it is right or wrong!

 

here https://www.onsemi.com/design/resources/design-resources/models?rpn=MBRA340
actually I saved it as txt and seems showing some results but not certain if it is right or wrong!

You have the wrong diode name.
It should be Dmbra340

 

You have the wrong diode name.
It should be Dmbra340

View attachment 260114

Thank you very much for your help.
the diode name was correct ,but not preceded by D? is that what makes the difference?I did not know that we must enter D before the name of the diode and wonder if it is the same for Transistors too

 

Thank you very much for your help.
the diode name was correct ,but not preceded by D? is that what makes the difference?I did not know that we must enter D before the name of the diode and wonder if it is the same for Transistors too

The diode model name was not correct. It needs to be the same as the name assigned by the author of the spice model.
If you view the content of MBRA340T3G.LIB.LIB file you will see that the name used for the diode model is prefixed with a "D".
The name is the text following the .MODEL statement, and looks like this:

.MODEL Dmbra340 d

There is no standard naming convention for spice models or devices and the name may or may not be the same as the real part. When an error is displayed like the one in post #1, experience has shown that the correct .model name (or .subckt name) should be the first thing verified.

 

The diode model name was not correct. It needs to be the same as the name assigned by the author of the spice model.
If you view the content of MBRA340T3G.LIB.LIB file you will see that the name used for the diode model is prefixed with a "D".
The name is the text following the .MODEL statement, and looks like this:

.MODEL Dmbra340 d

There is no standard naming convention for spice models or devices and the name may or may not be the same as the real part. When an error is displayed like the one in post #1, experience has shown that the correct .model name (or .subckt name) should be the first thing verified.

Thank you very much for the explanation.
I got always confused with this spice model and never understood a rule of it. and here I am stuck again with smaj5_0a zener diode where I do not know how to run it again due to the same error!! I named it MDD1, MDR, MDD3, MDRBV and smaj5_0a and still same error.

 

Thank you very much for the explanation.
I got always confused with this spice model and never understood a rule of it. and here I am stuck again with smaj5_0a zener diode where I do not know how to run it again due to the same error!! I named it MDD1, MDR, MDD3, MDRBV and smaj5_0a and still same error.

The diode is defined as a "subcircuit" using the ".subckt" keyword. Therefore, in LTspice, the symbol prefix attribute needs to be changed to "X" instead of "D"

 

The diode is defined as a "subcircuit" using the ".subckt" keyword. Therefore, in LTspice, the symbol prefix attribute needs to be changed to "X" instead of "D"

View attachment 260428

Thank you. I add thids to my note. I wish there were some unified modelling to be able to be learnt

 

Thank you. I add thids to my note. I wish there were some unified modelling to be able to be learnt

There is and the flexibility of the approach is the reason for all the different ways of doing things. There are things I would like to change as well, but they are minor.

 

Thank you. I add thids to my note. I wish there were some unified modelling to be able to be learnt

There are plenty of spice documents on the web that explain spice code and how it is structured.
The "X" in the LTspice symbol is an association with a type of component in spice code.

 

There are plenty of spice documents on the web that explain spice code and how it is structured.
The "X" in the LTspice symbol is an association with a type of component in spice code.

Yes yes. I am doing it now. do you think there are engineers who are doing this job? I have heard something like analog modelling

 

Yes yes. I am doing it now. do you think there are engineers who are doing this job? I have heard something like analog modelling

You can see that many companies are now providing spice models along with datasheets on their websites. Some companies are doing a better job than others.

 

You can see that many companies are now providing spice models along with datasheets on their websites. Some companies are doing a better job than others.

True