Finding a dedicated SPICE model for the analog multiplexer can be challenging because it is an older CMOS part. Most designers use generic subcircuits or newer functional equivalents like the for modern simulations. Key Download & Resource Links LTspice Community Models
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 cd4051 spice model link
Key Detail: This community-maintained library includes multiple variants (.subckt 4051 and 4051a). The 4051a variant is often preferred as it includes a more realistic Transmission Gate (TG) model, which better simulates the on-resistance and leakage characteristics of the actual CMOS hardware. 2. Technical Modeling Context Finding a dedicated SPICE model for the analog
Conclusion
To find and use a CD4051 (8-Channel Analog Multiplexer/Demultiplexer) SPICE model, you typically need to source it from third-party libraries or manufacturer archives, as modern manufacturers like Texas Instruments do not provide official models for these legacy parts. 1. Where to Find CD4051 SPICE Models Use a generic X (subcircuit) symbol: Place a
If you cannot find a specific CD4051 model, you can often use high-speed CMOS versions as a substitute for behavioral testing:
for a CD4051 so you can paste it directly into your simulation file?
X (subcircuit) symbol: Place a component, change its prefix to X, and value to CD4051..asy symbol from GitHub.