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
Finding and Using the CD4051 SPICE Model is a classic 8-channel analog multiplexer/demultiplexer widely used for signal routing. Because it is a legacy CMOS part, official SPICE models can be difficult to find directly on manufacturer sites like Texas Instruments . cd4051 spice model link
Conclusion
The CD4051 is an analog CMOS multiplexer/demultiplexer (8-channel single-ended or 4-channel differential) commonly used to route analog or digital signals under logic control. For circuit simulation, a SPICE model lets you predict on-resistance, channel-to-channel variation, switching transients, parasitic capacitances and body-diode behaviors that a simple ideal switch won’t show. Finding a dedicated SPICE model for the analog
LTspice Community Models: The LTspice Groups.io is a highly reliable archive where users share verified .lib, .sub, and .cir files for the CD4051. These models often include the necessary subcircuits to simulate the 8:1 multiplexing logic and transmission gate behavior. Because it is a legacy CMOS part, official