Beyond-the-Rails 16:2 Multiplexer

Multiplex ±5.5V Common-Mode Signal From a Single Supply Rail as Low as 1.6V

Please check latest availability status for a specific part variant.


The MAX14661 is a serially controlled, dual-channel analog multiplexer allowing any of the 16 pins to be connected to either common pin simultaneously in any combination. The device features Beyond-the-Rails capability so that ±5.5V signals can be passed with any single supply between +1.6V and +5.5V.

The serial control is selectable between I2C and SPI. Both modes provide individual control of each independent switch so that any combination of switches can be applied. I2C mode provides two address-select pins allowing for addressing up to four devices on a single bus. The SPI mode includes a DOUT pin that can be used to chain multiple devices together with a single select signal.

The IC is available in a 28-pin (4mm x 4mm) TQFN package and is specified over the -40ºC to +85ºC extended temperature range. The AB_ and COM_ pins provide ±10kV ESD protection (HBM).
MAX14661: Functional Diagram MAX14661: Functional Diagram Enlarge+

Key Features

  • Beyond-the-Rails Technology Reduces Cost and Complexity
    • Switch ± 5.5V Signals from a +1.6V Single Supply
    • Wide +1.6V to +5.5V Supply Range
    • Low 5.5Ω RON (typ) Across the Supply Range
  • Flexible Multiplexing Enables Design Reuse
    • 16:2 Matrix Switch Multiplexer Connects Any Input Pin To Either Common Pin In Any Combination
    • Each Switch is Independently Controlled via I2C or SPI
    • Programmable Shadow Registers Allow Simultaneous Updating
  • Low Distortion Switching Improves System Performance
    • Total Harmonic Distortion + Noise 0.005% (typ)
    • RON Flatness 2.5mΩ (typ) Across Complete Signal Range
  • Integrated Protection for System Reliability
    • ±10kV HBM ESD Protection on all AB_ and COM_Pins, Even When Powered Down


  • Audio Input Selection
  • Data Acquisition
  • I2C Signal Switching
  • System Diagnostics
Part NumberProtocolConfig.ChannelsVSUPPLY (Single)
VSUPPLY (Single)
Dynamic Range (max)
minmaxminmaxmaxmaxtypmaxmaxSee Notes
MAX14661 I2C
$3.44 @1k
See All Switches and Multiplexers (Low Voltage) (164)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX14661PMB1: Evaluation Kit for the MAX14661

Technical Documents

App Note 5902 A Chimera of Standards, or the Challenges of Adapting Prototyping Standards

Quality and Environmental Data

Product Reliability Reports: MAX14661.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Tools & Models

  • MAX14661 IBIS Model
  • CAD Symbols and Footprints

  • MAX14661ETI+
  • MAX14661ETI+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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    Environmental Management System >


    Related Resources

    Ultra-Small, Low-RON, Beyond-the-Rails DPST Analog Switches

    • Distortion-Free Beyond-the-Rails Signaling
    • Low Supply Current 65µA (typ) at 1.6V
    • ESD Protection on COM_,NO_