Texas Instruments manufactures the CD4051B (the 'B' is important—it's the improved version). TI is the most reliable source for SPICE models.
pull-down resistors to ground on all outputs to prevent "floating node" errors.
The lack of a manufacturer-backed CD4051 model is an inconvenience, but not an insurmountable one. With the community-built SwitchAna.Lib, the ngspice model, and the ideal switch workaround, you have a full toolset to simulate any circuit using this versatile multiplexer. Your choice depends on your simulator, accuracy requirements, and skill level, but the path forward is clear.
: Launch LTspice. Then, open the SwitchAna.Lib file by dragging and dropping it into the LTspice window or by using the File -> Open command. cd4051 spice model link
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The CD4051 is a complex IC that consists of multiple analog switches, which can be configured as a multiplexer or demultiplexer. Its SPICE model must accurately represent the device's behavior, including its electrical characteristics, switching times, and other relevant parameters. A reliable CD4051 SPICE model will help you:
If a direct structural model for the legacy CD4051 variant is unavailable, substitute it with pin-compatible equivalents. Highly accurate structural models exist for the NXP HEF4051 Go to product viewer dialog for this item. Texas Instruments manufactures the CD4051B (the 'B' is
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: The most reliable source for a CD4051 SPICE model is often community-maintained libraries. A
Maxim (now part of Analog Devices) made the MAX4051, a pin-compatible upgrade. While not identical, the MAX4051 SPICE model is often interchangeable for low-frequency work. The lack of a manufacturer-backed CD4051 model is
for a CD4051 so you can paste it directly into your simulation file?
: In LTspice, use the spice directive .lib your_filename.lib to include the model.
For users of open-source tools like and its integrated ngspice simulator, a verified and working CD4051B model is available.