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.
: Open the library file in LTspice, right-click the .SUBCKT CD4051 line, and select "Create Symbol" . This creates a functional component box with the correct pin mappings.
and the high-speed CMOS TI CD74HC4051 , which are accessible through their respective enterprise component platforms. Note that the 74HC line features significantly lower ON-resistance ( RONcap R sub cap O cap N end-sub ) than standard legacy 4000 series chips. Structural SPICE Subcircuit Definition LTspice@groups.io | CD4051 model
If you need help setting up your simulation schematic, let me know:
"Accurate Circuit Simulations with CD4051 SPICE Model: A Comprehensive Guide"
Press T on your keyboard (in LTspice) to open the text tool. Select the radio button.
limits. The CD4051 allows digital signals to be 0-5V while switching analog signals between -5V and +5V, provided VEEcap V sub cap E cap E end-sub is tied to -5V.
If you are having trouble getting your specific simulation file to run, let me know:
Signal routing, instrumentation, and analog-to-digital converter expansion. 2. Why Do You Need a SPICE Model for CD4051?
Because official standalone support from prime silicon vendors is scarce for the legacy CD4000 series, you can secure reliable, tested .subckt macromodels through trusted third-party repositories and community libraries:
. This file contains the .subckt model for the CD4051 (and often 4052/4053) that can be integrated into LTspice or other SPICE simulators like PSpice. Alternative Sources
* Subcircuit syntax: X1 Out In0 In1 In2 In3 In4 In5 In6 In7 A B C INH VDD VEE GND CD4051B Use code with caution. Troubleshooting Common Simulation Errors "Unknown subcircuit called"