The CD4051 remains an indispensable component in an analog designer's toolkit. With the help of the community-sourced resources compiled here, you can now confidently simulate, validate, and perfect your designs long before you build them.
✅ (archived but still accurate) 🔗 [Insert link to model file from a trusted repo like GitHub or ECMag]
Here is where you can find these models:
Elara copied the entire block, saved it as cd4051.lib , and linked it to her simulation schematic. She held her breath and hit "Run."
You can use the default Mux-8 symbol found in LTspice’s standard component library ( [Misc] or [Digital] directories). cd4051 spice model link
Finding a dedicated SPICE model for the CD4051 Go to product viewer dialog for this item.
: You can find symbols and footprints (though often without simulation data) on sites like SnapEDA and Ultra Librarian Alternative Parts : Many designers use the 74HC4051 Go to product viewer dialog for this item.
So, if the manufacturers don't provide a model, is all hope lost? Absolutely not. The engineering community has stepped in to fill this gap, creating and sharing robust, accurate SPICE models for the CD4051, primarily for use with LTspice, which is a high-performance, free SPICE simulator from Analog Devices.
(positive supply). If you are only switching positive analog signals, you must explicitly connect VEEcap V sub cap E cap E end-sub VSScap V sub cap S cap S end-sub The CD4051 remains an indispensable component in an
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 absolute most reliable resource for a native .lib or .sub file for the 4000-series logic IC family is the LTspice Groups.io Technical Forum .
: Many LTspice users utilize the CD4000_v.lib or 74hc.lib collections, which often include these multiplexers. Guides on how to integrate these libraries can help you set up the simulation environment. Simulation Considerations On-Resistance ( RONcap R sub cap O cap N end-sub ) : The CD4051 is known for a relatively high RONcap R sub cap O cap N end-sub (typically 125 Ωcap omega
Make sure the order of the pins in your .SUBCKT line exactly matches the pins in your schematic symbol. She held her breath and hit "Run
: Ensure you have the cd4051.sub or cd4051.lib file, or that you have the SwitchAna.lib integrated.
Whether you are building an analog synthesizer, a data acquisition system, or simply running a SPICE simulation for a class project, the resources outlined here will help you get the job done.
often provide more realistic transmission gate (TG) behavior compared to basic "box" models. Supply Voltage:
Method 2: Adding to the Global LTspice Library (Best for long-term use) Copy the text inside your downloaded CD4051 model file.