Cd4051 Spice Model Link May 2026

For users of the KiCad/ngspice ecosystem, models are typically found in open repositories.

If you are using a simulator that doesn't support PSpice syntax (like some stripped-down versions of Multisim or Tinkercad), you may need to construct the model using primitives.

The CD4051 is essentially an 8-to-1 decoder attached to 8 transmission gates. You can build a functional model by:

For professional results, download the PSpice model from the Texas Instruments product page. It is the most robust model available online that correctly accounts for voltage-dependent switching resistance, which is the most critical parameter to simulate when using a CD4051.

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 LTspice Groups.io forum contains user-contributed models for the CD4051 and related 4000-series parts. You can find them in the LTspice Files > Lib > Digital HC4xxx GitHub Repositories cd4051 spice model link

: Community-maintained libraries often include the 4051. The AcheronProject LTSpice library includes symbols and models for variants like the SN74LV4051A Manufacturer Support Texas Instruments (TI) provides a comprehensive datasheet for the

, they typically offer SPICE or IBIS models for newer logic families (like LV-A or HC) rather than the legacy metal-gate 4000 series. Third-Party Model Indexes LTwiki.org

maintains a list of external collection links that often house generic CMOS models. Robots.freehostia SPICE Index

contains over 20,000 entries and is a reliable backup for finding cross-referenced parts. Implementation Tips CD4051 model - LTspice - Groups.io

Finding a dedicated SPICE model for the analog multiplexer can be challenging because it is a legacy CMOS part. Many manufacturers do not provide standalone SPICE models for these older logic ICs directly on their product pages. TI E2E support forums Available Models and Alternatives LTspice Community Models For users of the KiCad/ngspice ecosystem, models are

: The most reliable source for a CD4051 SPICE model is often community-maintained libraries. A

file containing models for the CD4051, CD4052, and CD4053 is available through the LTspice Groups.io 74HC4051 Alternative

: If your simulation doesn't strictly require the 20V range of the CD series, a model for the

(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

: Does not always have the specific CD4051 but contains general 8-channel multiplexer models that can be found by searching "multiplexer" in the component selection screen. You can build a functional model by: For

: Often includes CD4000 series models in its default libraries. Key Specifications for Manual Modeling

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

CD4051B data sheet, product information and support | TI.com

The CD4051B is a widely used CMOS device. Key simulation parameters required for accurate modeling include:

If you’ve ever designed a multichannel analog multiplexer into your circuit, you’ve likely met the CD4051 — the 8-channel analog switch that’s been a workhorse in everything from Arduino sensor arrays to professional instrumentation.

But here’s the catch: simulating it accurately requires a reliable SPICE model. And hunting one down? That can feel like searching for a needle in a haystack of outdated manufacturer FTP sites.

Even with the correct link, simulations fail. Here is why: