CD4051BM: Overview,Specifications,Main uses,Features,application fields,working principle and alternative models


CD4051BM Overview:

The CD4051BM is a CMOS analog multiplexer/demultiplexer chip that provides analog signal routing capabilities. It is designed to select one of eight analog input signals and route it to a single output based on the control inputs. Here is an overview of the CD4051BM, including specifications, main uses, features, application fields, working principle, and alternative models:



  • Type: Analog Multiplexer/Demultiplexer
  • Control Inputs: 3 (Binary control for selecting the input)
  • Analog Inputs: 8 (A0-A7)
  • Output: 1 analog output
  • Supply Voltage: Typically 3V to 18V
  • Low Power Consumption: Suitable for battery-operated devices
  • Package: SOIC (Small Outline Integrated Circuit)

Main Uses:

  • Analog Signal Multiplexing: Selecting one of multiple analog signals for processing or measurement.
  • Signal Routing: Switching between different analog inputs in a system.
  • Data Acquisition Systems: Used for scanning multiple sensors or input sources.
  • Audio and Video Signal Switching: Routing audio or video signals in entertainment systems.
  • DataSheet

    CD4051BM PDF


  • Low ON Resistance: Allows for minimal signal distortion during switching.
  • Wide Voltage Range: Compatible with various analog signal levels.
  • High Input Impedance: Minimizes loading effects on signal sources.
  • Fast Switching Speed: Enables rapid selection of input channels.
  • Decoding Logic: Binary control inputs simplify selection of input channels.

Application Fields:

  • Instrumentation: Used in test and measurement equipment for signal conditioning.
  • Automation: Employed in automated systems for sensor interfacing.
  • Audio Switching: Routinely found in audio mixing boards and switchers.
  • Communication Systems: Utilized for signal processing in communication devices.

Working Principle:

  • The CD4051BM operates based on binary control inputs that select one of the eight analog inputs.
  • When the control inputs are configured accordingly, the selected input channel is connected to the common output pin.
  • The multiplexer's low ON resistance ensures minimal signal attenuations and distortions during switching.

Alternative Models:

  • CD4052: Dual 4-channel analog multiplexer/demultiplexer offering similar functionality.
  • DG406: An alternative analog multiplexer IC with similar characteristics.
  • 74HC4051: A CMOS single 8-channel analog multiplexer/demultiplexer alternative.


  • The CD4051BM is a versatile analog multiplexer/demultiplexer commonly used for selecting analog signals in various electronic applications.
  • Alternative models may offer similar functionality with minor differences in specifications, package types, or additional features.

The CD4051BM analog multiplexer/demultiplexer chip is a fundamental component in signal switching and routing applications, providing efficient selection of analog signals for processing or distribution purposes in diverse fields such as instrumentation, automation, audio/video systems, and communication devices.