Cd4051 Spice Model — Link _verified_
The CD4051 is a classic CMOS 8-channel analog multiplexer/demultiplexer. Because this part has been in production for decades, finding a single "official" active link can be difficult as manufacturers often retire older simulation files. 1. Primary SPICE Model Sources
The second hit was a StackExchange discussion from three years ago. A user named "mux_life" had posted a raw, text-based model: cd4051 spice model link
- Cause: You forgot to connect the VEE pin. For analog signals that swing negative, VEE must be tied to the most negative supply (e.g., -5V). If VEE is floating or tied to GND, the CMOS switches cannot shut off.
- Fix: Connect VEE to the most negative rail in your system. For single-supply (0-10V), tie VEE to GND.
Once you have the CD4051 SPICE model link downloaded and imported, run this basic simulation to verify functionality. The CD4051 is a classic CMOS 8-channel analog