Features and Benefits

  • ±1°C accuracy from -10°C to +85°C
  • Measures temperatures from -55°C to +125°C (-67°F to +257°F)
  • 9- to 12-bit user-configurable resolution
  • Dedicated thermostatic logic output
  • Thermostatic settings are user-programmable
  • Data is transferred over 2-wire/SMBus interface
  • Three address inputs allow up to eight DS1721 to operate on one bus
  • 2.7V to 5.5V supply range
  • 150mil 8-pin SO (DS1721S) and 8-pin µMAX/µSOP (DS1721U) packages

Product Details

The DS1721 digital thermometer and thermostat features ±1°C accuracy over a -10°C to +85°C range. Thermometer data is read out over a 2-wire serial bus in 2's complement format with 9 to 12 bits of resolution (user-programmable). The DS1721 features three address inputs, allowing users to multidrop up to eight DS1721 devices on one bus.

The DS1721 offers thermostatic functionality with over-temperature (TH) and under-temperature (TL) user-programmable trip-points stored in on-chip SRAM. The two trip-points provide programmable thermostat hysteresis: the thermostat output is asserted when the measured temperature exceeds TH and it remains active until the temperature falls below TL.

The DS1721 is available in 150mil 8-pin SO (DS1721S) and 8-pin µMAX/µSOP (DS1721U) packages. For applications requiring higher precision, the DS1631 provides ±0.5°C accuracy and is functionally compatible with the DS1721.


  • Alarm Systems
  • Fibre Channel
  • Instrumentation
  • Networking

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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DS1721 Companion Parts

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