CD4051 Single 8-Channel Multiplexer/Demultiplexer IC (DIP)

CD4051 Single 8-Channel Multiplexer/Demultiplexer (DIP) — Overview

The CD4051 is a single 8-channel analog/digital multiplexer and demultiplexer implemented in low-power CMOS. It routes one common input/output to any one of eight individual channels under digital control. Because each channel is bidirectional, the CD4051 is well suited for routing analog voltages, audio signals, sensor lines, or digital logic between circuits.

How it works

Three binary address inputs (A, B, C) select which of the eight channels is connected to the common I/O. An enable (inhibit) input allows you to enable or disable the device, providing simple switching control for multiplexing or signal gating.

Key Features

• Single 8-channel multiplexer/demultiplexer
• Wide supply voltage range: 3 V to 15 V
• Low-power CMOS technology
• Three address inputs (A, B, C) for channel selection
• Enable/inhibit pin for control and flexibility
• Bidirectional channels for analog and digital signals
• Standard 16-pin DIP package for easy prototyping

Technical Specifications (typical)

• Supply voltage (VDD): 3 V to 15 V
• Package: 16-pin Dual Inline Package (DIP)
• Control inputs: 3 address pins + enable/inhibit
• Signal type: Supports analog and digital signals over device supply rails
• Technology: Low-power CMOS

Applications

• Data acquisition and multiplexed ADC inputs
• Instrumentation and test equipment
• Analog and digital signal routing and switching
• Sensor multiplexing and multiplexed displays
• Audio and low-frequency signal selection

Typical Use and Best Practices

• Connect the VDD and VSS rails within the recommended 3 V to 15 V range to ensure reliable operation.
• Keep control signal levels within the supply rails to avoid undefined states.
• For analog signals, ensure that input amplitudes stay within the device supply rails to prevent distortion.
• Use the enable pin to tristate or isolate channels when not in use for simpler system control.
• Place decoupling capacitors close to VDD and VSS when using on a PCB to improve stability and reduce noise.

Package and Prototyping

The CD4051 is supplied in a standard 16-pin DIP which makes it easy to mount on breadboards and through-hole PCBs. This package is ideal for rapid prototyping and educational projects.

Why choose the CD4051

The CD4051 combines analog compatibility, low power consumption, and a wide supply voltage window, making it a flexible choice for mixed-signal designs, hobbyist projects, and professional instrumentation where compact and dependable multiplexing is required.

Ordering and Notes

Commonly available in through-hole DIP packages for easy prototyping. Check manufacturer datasheets for detailed electrical characteristics and absolute maximum ratings before designing into production systems.

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