After years of forum crawling and vendor link hunting, the most robust remains the official Texas Instruments model for the CD4051B. Use this direct approach:
is a widely used 8-channel analog multiplexer/demultiplexer, but finding a single "official" SPICE model can be challenging because it is a legacy CMOS part. Instead of a single download link, users typically find these models through community libraries or derivative part models from major manufacturers. TI E2E support forums CD4051 SPICE Model Sources LTspice Community Libraries: The most reliable community source is the LTspice Groups.io archive, which contains a file including subcircuit definitions ( ) for the CD4051, CD4052, and CD4053. Manufacturer Alternatives: cd4051 spice model link
by Bordodynov, which is widely considered the gold standard for LTspice users. Pro-Tip for Implementation: When you do find a model link, ensure it includes the After years of forum crawling and vendor link
This report details the acquisition, verification, and implementation of SPICE simulation models for the CD4051 integrated circuit. The CD4051 is a single 8-channel analog multiplexer/demultiplexer with logic-level conversion. Due to the mature nature of this component, models are available through the original manufacturer (Texas Instruments) and third-party open-source libraries. This report provides direct links to these resources and guidance on integrating them into standard simulation environments. TI E2E support forums CD4051 SPICE Model Sources
However, when moving from a breadboard to a simulation environment (like LTspice, OrCAD, Multisim, or Ngspice), many engineers hit a frustrating wall:
Valid SPICE models for the CD4051 are readily available from Texas Instruments. For highest fidelity, the manufacturer model is recommended over generic "Analog Switch" macros. Engineers should be prepared to perform manual symbol creation in simulation environments like LTspice or ngspice, as the component is not always included in the standard library manifests.