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Description: The SparkFun Multiplexer Breakout provides access to all pins and features of the 74HC4051, an 8-channel analog multiplexer/demultiplexer. The 74HC4051 allows you to turn four I/O pins into eight multifunctional, individually selectable signals, which can be used to do everything from driving eight LEDs to monitoring eight potentiometers.

The 74HC4051 can function as either a multiplexer or a demultiplexer, and it features eight channels of selectable inputs/outputs. The routing of common signal to independent I/O is set by digitally controlling three select lines, which can be set either high or low into one of eight binary combinations.

One half of the board breaks out the control signals (E, S0-S2) and common input/output (Z). The other side provides access to all eight independent I/O’s (Y0-Y7). Both sides include supply and ground connections (VCC, VEE, GND).

Get Started with the 74HC4051 Breakout Guide


  • Switches analog or digital signals
  • 8 channels controlled by 3 select inputs
  • Wide voltage supply range: 2 – 10V
  • Bipolar supply support (e.g., ±5V)
  • Optional enable input
  • Breadboard compatible breakout


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Customer Comments

  • Ummm. Is this an early April Fool’s joke? Why would anyone buy this when you can just buy a DIP version of this chip for under 1/3 the price?

    • Personally, I’d gladly pay a little more for a breakout board than a bare chip most of the time. I have limited time (and patience) for my electronics hobby and I’d rather put my effort towards being creative. It’s sort of like the calculator philosophy – I know I can do the math by hand, so I don’t feel concern letting the calculator do the work. It’s the same reason I buy Arduino boards instead of bare Atmel chips most of the time.

      • Mr Mai / last year / 2

        -The entire reason people buy from sparkfun

      • There’s a huge difference between an Arduino board and a bare Atmel chip. There’s all sorts of extra components you need to even use an Atmel chip.

        However, all this is is just the chip on a board with the pins marked. All you need to use a DIP 74HC4051 is the pinout which you can just get from a datasheet.

        • Arbiag / last year / 3

          Depends on your needs. If you’re adding this to a custom circuit, or using a breadboard, definitely use the chip. If you’re adding to an existing circuit or want to combine generic components without building a new circuit board, the breakout is the way to go.

    • the reason is very simple: you are at their website… they are not at your.

    • Madone / last year / 1

      Why ask why? Drink Bud Dry.

  • Complete NOOB question so thank you for your patience in advance. I need to run a single 7 segment display like this one: It looks like I can use this board to drive the display. Is that correct or is there another chip I should use? Thank you for your help.

  • Mounting holes: 0.9" center-to-center

  • What happens if you leave the S pins floating?

  • The breakout guide lists the bits for selecting Y1 and Y2 as the same (L,L,H)


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Related Tutorials

Multiplexer Breakout Hookup Guide

August 18, 2016

How to use the 74HC4051 multiplexer breakout to drive eight LEDs, read eight button inputs, or monitor eight potentiometers.