Features and Benefits

  • Maximize System Accuracy in Broad Range of Thermal Management Applications
    • Operating Temperature Range: -55°C to +125°C (-67°F to +257°F)
    • DS1631 and DS1631A: ±0.5°C Accuracy over 0°C to +70°C Range
    • DS1731: ±1°C Accuracy over a -10°C to +85°C Range
    • User-Selectable Output Resolution from 9 Bits to 12 Bits
  • Reduce Cost with No External Components
  • Simplify Distributed Temperature-Sensing Applications with Multidrop Capability
    • Up to Eight Devices Can Operate on a 2-Wire Bus
  • Flexible and Nonvolatile User-Defined Thermostatic Modes with Custom Hysteresis
  • Available in 8-Pin µSOP and SO (DS1631 and DS1631A Only) and the 8-Pin DIP (DS1631 Only) Packages

Product Details

The DS1631, DS1631A, and DS1731 digital thermometers provide 9, 10, 11, or 12-bit temperature readings over a -55°C to +125°C range. The DS1631 and DS1631A thermometer accuracy is ±0.5°C from 0°C to +70°C with 3.0V ≤ VDD ≤ 5.5V, and the DS1731 accuracy is ±1°C from -10°C to +85°C with 3.0V ≤ VDD ≤ 5.5V. The thermostat on all three devices provides custom hysteresis with user-defined trip points (TH and TL). The TH and TL registers and thermometer configuration settings are stored in NV EEPROM so they can be programmed prior to installation. In addition, the DS1631A automatically begins taking temperature measurements at power-up, which allows it to function as a stand-alone thermostat.


  • Medical
  • Networking
  • Personal Computing
  • Routers/Switches
  • Test Measurement Systems
  • Wireless Base Stations

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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DS1731 Companion Parts

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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.