Features and Benefits

  • 2-Wire Serial Interface
  • 2.7 V to 5.5 V Single Supply
  • 2.5 Ω On Resistance
  • 0.75 Ω On-Resistance Flatness
  • 100 pA Leakage Currents
  • Single 8-to-1 Matrix Switch
  • Power-On Reset
  • Small 16-Lead TSSOP Package
  • Qualified for Automotive Applications

Product Details

The ADG728 is a CMOS analog matrix switch with a serially controlled 2-wire interface. It is an 8-channel matrix switch. On resistance is closely matched between switches and very flat over the full signal range. This part can operate equally well as a multiplexer, demultiplexer or switch array and the input signal range extends to the supplies. 

The ADG728 and ADG729 utilize a 2-wire serial interface that is compatible with the I2C™ interface standard. Both have two external address pins (A0 and A1). This allows the 2 LSBs of the 7-bit slave address to be set by the user. Four of each of the devices can be connected to the one bus. The ADG728 also has a RESET pin that should be tied high if not in use.

Each channel is controlled by one bit of an 8-bit word. This means that these devices may be used in a number of different configurations; all, any, or none of the channels may be on at any one time.

On power-up of the device, all switches will be in the OFF condition and the internal shift register will contain all zeros.

All channels exhibit break-before-make switching action preventing momentary shorting when switching channels.

The ADG728 and ADG729 are available in 16-lead TSSOP packages.

Product Highlights
  • 2-Wire Serial Interface.
  • Single Supply Operation. The ADG728 and ADG729 are fully specified and guaranteed with 3 V and 5 V supply rails.
  • Low On Resistance 2.5 Ω typical.
  • Any configuration of switches may be on at any one time.
  • Guaranteed Break-Before-Make Switching Action.
  • Small 16-Lead TSSOP Package.


  • Data Acquisition Systems
  • Communications Systems
  • Relay Placement
  • Audio and Video Switching
  • Automatic Test Equipment

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.