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1. Texas Instruments SPICE models
2. ST SPICE models
3. NXP IBIS модели доступны на сайте NXP, например https://www.nxp.com/products/analog/signal-chain/analog-switches/low-ohmic-single-pole-double-throw-analog-switch:NX3L1T3157?fpsp=1&tab=Design_Tools_Tab&lang=en&lang_cd=en&
IBIS можно конвертировать в SPICE: http://www.spisim.com/products/free-apps/spisim_ibis-a-free-web-app-for-simulating-ibis-using-free-simulators/