> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# SparkFun Multiplexer Breakout - 8 Channel (74HC4051)

**Type:** Product page · **SKU:** BOB-13906 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/sparkfun-multiplexer-breakout-8-channel-74hc4051.html ([markdown](https://core-electronics.com.au/sparkfun-multiplexer-breakout-8-channel-74hc4051.html.md))

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.

## Pricing

- **Price:** $5.95 (inc GST) — $5.41 AUD, exc GST
- **Quantity discounts:** 5+ $5.25 (exc GST) · 25+ $5.14 (exc GST) · 100+ $4.92 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 20 and Aug 26.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=BOB-13906:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/BOB-13906:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## 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](https://learn.sparkfun.com/tutorials/multiplexer-breakout-hookup-guide)

Features:

- 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
 
Documents:

- [Schematic](https://core-electronics.com.au/attachments/localcontent/SparkFun-74HC4051-8-Channel-Mux-Breakout_70896986fd9.pdf)
- [Eagle Files](https://core-electronics.com.au/attachments/localcontent/SparkFun-74HC4051-8-Channel-Mux-Breakout_13068b77edb.zip)
- [Hookup Guide](https://learn.sparkfun.com/tutorials/multiplexer-breakout-hookup-guide)
- [Datasheet](https://core-electronics.com.au/attachments/localcontent/74HC_HCT4051_29600711d21.pdf) (74HC4051)
- [GitHub](https://github.com/sparkfun/74HC4051_8-Channel_Mux_Breakout)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/b/o/bob-13906-010.jpg)