High-Precision 3-Wire Digital Thermometer and Thermostat

High-Precision, 3-Wire Digital Thermometers/Thermostats Provide Temperature Measurements and Stand-Alone Thermostat Capability over a -55°C to +125°C Range

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The DS1626 and DS1726 digital thermometers/thermostats provide temperature measurements and stand-alone thermostat capability over a -55°C to +125°C range. The DS1626 offers ±0.5°C accuracy from 0°C to +70°C and the DS1726 has ±1°C accuracy from -10°C to +85°C. The resolution of the measured temperature is user selectable from 9 to 12 bits. Communication with the DS1626 and DS1726 is achieved through a 3-wire serial bus.

The DS1626 and DS1726 offer thermostatic functionality with three dedicated thermostat outputs (THIGH, TLOW, and TCOM), and overtemperature (TH) and undertemperature (TL) user-programmable thresholds stored in on-chip EEPROM. For stand-alone thermostat operation, TH and TL can be programmed prior to installation, and the DS1626/DS1726 can be configured to automatically begin taking temperature measurements at power-up. Table 1, in the full data sheet, summarizes the user-accessible registers. Figure 1, in the full data sheet, shows a functional diagram.
DS1626, DS1726: Functional Diagram DS1626, DS1726: Functional Diagram Enlarge+

Key Features

  • Temperature Measurements Require No External Components
  • Measure Temperatures from -55°C to +125°C (-67°F to +257°F)
  • DS1626: ±0.5°C Accuracy from 0°C to +70°C
  • DS1726: ±1°C Accuracy from -10°C to +85°C
  • Output Resolution is User Selectable to 9, 10, 11, or 12 Bits
  • Wide Power-Supply Range (2.7V to 5.5V)
  • Convert Temperature to Digital Word in 750ms (max)
  • Stand-Alone Thermostat Capability
  • Thermostatic Settings are User Definable and Nonvolatile (NV)
  • Data is Read/Written Through a 3-Wire Serial Interface
  • Available in 8-Pin µSOP Package


  • Any Space-Constrained Thermally Sensitive Application
  • Consumer Products
  • Industrial Controls
  • Thermostatic Controls

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Oper. Temp.
See Notes
DS1626 Local
Dual Temperature Alarms
Standalone Thermostat
One0.5NoProgrammable (NV)
-55 to +125
SOIC (W)/8
$1.91 @1k
DS1726 1
$1.88 @1k

See parametric specs for Temperature Switches (19)

Part NumberTemp. Thresh.
DS1626 Programmable
See Data Sheet
See Data Sheet

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.
Product Reliability Reports: DS1726.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

Quality Management System >
Environmental Management System >


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