Features and Benefits

  • Up to 1MHz Serial Clock, Fast-mode Plus (Fm+)
  • Selectable Link Baud Rates Extend I2C Up to 1200m
  • Protected from Overvoltage Line Faults to ±60V
  • ±40kV ESD on Link Pins
  • IEC Level 4 ESD ±8kV and EFT ±5kV on Link Pins
  • Extended Common Mode Range: ±15V
  • Remote Interrupt/SMBALERT and Control Signals
  • Low EMI Mode
  • SMBus 3.0 Compatible
  • I2C Idle Detection, and Stuck Bus Protection
  • I2C Device Address Sharing
  • 3V to 5.5V Supply Voltage
  • 1.62V to 5.5V Logic Supply
  • 4mm × 5mm 20-Lead QFN package

Product Details

The LTC4331 is a point-to-point SMBus compatible I2C slave device extender designed for operation in high noise industrial environments. Using a ±60V fault protected differential transceiver, the LTC4331 can extend an I2C/SMBus bus, including SMBALERT and a control signal, over a single twisted pair differential link up to 1200m. With an extended common mode operating range the solution provides tolerance to large ground differences between nodes. For EMI sensitive environments, a slew rate control pin reduces the EMI emitted from the differential link.

In addition, the LTC4331 can act as an I2C to I2C bridge allowing independent bus frequencies between the local and remote networks. The solution is completely transparent to the master requiring no additional code in most cases; however, a control interface is provided for additional configuration and fault monitoring.

A master controller fully supporting SCL clock-stretching is strongly recommended.


  • Industrial Control and Sensors
  • Lighting and Sound System Control

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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Reference Designs (1)

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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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.