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If you meant LM321, it is a single version of an LM324.

The LM121 has a differential output. Pinout is 1: output 2 2: IN- 3: IN+ 4: V- 5: balance 6: balance 7: V+ 8: output 1

All the models do not show the proper LM121 differential output configuration. Andy, you are correct about the LM121 being special. The old National Semi Apps Handbook has the LM121 and LM118 used as

It looks like the LM121/LM321 was a very ordinary 1 MHz GBP op-amp, but maybe with somewhat lower operating power (lower supply current).? It is capable of +/-16 V supplies, but optimized for 5 V

As I say, it's been too many years.? But I do not remember that the LM121 was anything like the LM118.? The latter was optimized for high slew rate and bandwidth, unusually high in its day. Andy

Remember that LM121, LM221, and LM321 are the same, just with different worst-case ratings. There is something that claims to be an LM321 SPICE model, here:

Derek, There is a PSPICE version on that list.? I use it all of the time in LTspice.

If it's a Tina model, it might be compatible with LTspice, but might need some tweaks. -- This email has been checked for viruses by AVG antivirus software. www.avg.com

Now to put it into something that LTSpice can use. Any suggestions where to start? This looks to be an OrCAD / TINA thing. I will peruse myself.

Derek, will this work? LM321LV data sheet, product information and support | TI.com ( https://www.ti.com/product/LM321LV#design-tools-simulation )

I am trying to work out some old schematic and circuit issues and am looking for a model for the old LM121 opamp. Anyone have such a thing? I found the LM118, as I can use the LTSpice LT118A model.

Great! I look forward to 24.1.6. -- Regards, Tony

Hi Tony, The next update 24.1.6 will support this again. The official syntax for loading table data from a file will be: table(x, .include "<filename>") but yours will also work as is. You will also

Apologies for the mis-steps. Thank you very much for taking the time to explain everything so clearly. I will restore the standard.bjt file and follow your suggestions with regard to the circuit and

So I was right about two different data sources, but both are models, not one model and one measurement results.? The moral of that is, says the Duchess (not of Sussex), is 'Caveat Simulator'.

I wrote: That one, the non-encrypted generic SPICE model, is even older, from 2019 and apparently not updated since.? Who knows what that means. Andy

That is possible, but I think not likely.? By my read, the whole purpose of that Application Note is to show you the results of SPICE simulations.? Therefore, I think none of its plots were from

This is a minor oversight (aka bug) in LTspice. It can't decrypt the file. You can clearly see this from the error messages in the log. Will be fixed in 24.1.6. Meanwhile you can work around it: open

Good point. Pixel pitch, I guess is the more proper term. -- Michael Stokowski LTspice Team Analog Devices Inc.

One more thing to mention here: Because LTspice finds the lack of a load (DC path) connected to node Vout, it "corrects" the omission by adding a small conductance (large resistance) there.? It has