The KiCad forum user provided a CD4051B._lib file that is ready to use.
The definitive community repository for this specific IC is available on the LTspice Groups.io Community . Members have rigorously tested and uploaded a multi-model subcircuit file that covers the CD4051, CD4052, and CD4053, successfully simulating analog transmission gates.
Despite the lack of an official model, the engineering community has developed several excellent and reliable solutions. Here are the most viable ways to obtain a functional CD4051 SPICE model.
Signal routing, instrumentation, and analog-to-digital converter expansion. 2. Why Do You Need a SPICE Model for CD4051? cd4051 spice model link
Begin by testing the SwitchAna.Lib model in a simple test circuit (e.g., switching a DC voltage between COM and Y0). Compare its behavior to the datasheet. For advanced users, download the datasheet and start mapping the internal logic gates into a custom subcircuit. The community has laid the groundwork; now it's your turn to build on it.
between legacy CMOS variants and modern equivalents
Even with a valid , simulations fail. Here is your troubleshooting cheat sheet: The KiCad forum user provided a CD4051B
I can provide the specific subcircuit text or guide you through mapping the pins exactly to your circuit layout. Share public link
If you cannot find a link and need to approximate the behavior using a subcircuit of ideal switches and logic gates, use these typical Texas Instruments CD4051B datasheet ON Resistance ( cap R sub o n end-sub : Typically : Approximately Supply Voltage Switching Type : Break-before-make. Where to Check for Updates Texas Instruments : While they currently only provide symbols and footprints on SnapEDA, check the "Design & development" tab on the CD4051B product page for any newly released PSpice models. : Check their simulation and modeling support for newer 74HC/HCT4051 variants. file into a specific simulator like
(high-speed CMOS version) is more commonly available and can often be found in standard digital libraries like the 74HC40xx switches ZIP Built-in Simulator Libraries NI Multisim Despite the lack of an official model, the
or Yahoo Groups archives (now migrated to groups.io). You’ll find the CD4051 model bundled in the Standard CD4000 Library
When setting up your simulation symbol, ensure your software pins map directly to the hardware pins. A mismatch will cause convergence errors or incorrect routing behavior. Pin Number Description 1, 2, 4, 5, 12, 13, 14, 15 CH 0 - CH 7 Independent Analog Inputs / Outputs COM OUT/IN Common Analog Output or Input channel Inhibit / Disable pin (Active HIGH) Negative Supply Voltage (For bipolar analog signals) Digital Ground Digital Select Inputs (MSB to LSB) Positive Supply Voltage (+3V to +18V) Critical Simulation Parameters and Tips