Transistor-level models with sharp transitions can cause “timestep too small” errors. Try adding Rshunt=1e9 across nodes, or use cshunt=1pf in .OPTIONS.

For most PCB-level designers, creating a behavioral subcircuit is the most effective way to model the CD4051. Let’s break down how to construct a model for a single channel using the SPICE voltage-controlled switch.

) effects, and switching timing before building physical hardware. Why Use a CD4051 SPICE Model?

A generic SPICE model often simplifies these into ideal resistors and switches, leading to simulation results that look perfect but fail to predict real-world non-linearities.

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