The Adafruit ADG729 is a solid-state dual 1-to-4 analog matrix switch controlled over I2C. It provides two independent groups of 4 switches — four channels routed to the DA pin and four channels routed to the DB pin — giving you 8 total switches in a compact package. Unlike relays, analog switches have no moving parts, won't wear out, and switch in approximately 100 ns.

The ADG729 features 8 independent switches rather than a simple multiplexer, so you can turn on multiple switches simultaneously within each group to merge signals together, or use each group as a traditional SP4T selector. The signal path is fully bidirectional. Break-before-make switching ensures clean transitions between channels.

Key Features

• Dual 4-Channel Groups – Four switches route to DA, four route to DB
• 8 Independent Switches – Control each switch individually via I2C
• Fast Switching – Approximately 100 ns switch time
• Break-Before-Make – Deselected switches open before selected switches close
• Bidirectional – Signal path works in either direction
• Configurable Address – Default 0x44, adjustable to 0x45/0x46/0x47 via address pins
• STEMMA QT / Qwiic Connectors – Solderless I2C connection
• Signal Voltage – Supports analog signals up to 5V

Also Available

• ADG728 1-to-8 Analog Matrix Switch – All 8 signals route to a single D pin

Ideal For

• Dual-channel analog signal routing
• Stereo audio switching
• Sensor multiplexing with separate output buses
• Test and measurement systems

Package Contents

• 1× Adafruit ADG729 Dual 1-to-4 Analog Matrix Switch Breakout