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Hello Mina,
The LMX339 is from Maxim. If you need the model for that device, please contact Maxim directly.
Our LMV339 or LMV339-N would be our equivalent. You can find the SPICE model under the Design tools & simulation tab in the LM339-N product folder.
For an improved device, consider the LM339LV. It also has a model.