Digital Thermometer and Thermostat in SOT23

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The DS1775 digital thermometer and thermostat is offered in a tiny 5-pin SOT-23 package and provides ±2°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 DS1775 is available with eight different hard-wired addresses, allowing up to eight DS1775 devices to operate on the same bus. The eight versions of the DS1775 are:

Part Number Address
DS1775R 000
DS1775R1 001
DS1775R2 010
DS1775R3 011
DS1775R4 100
DS1775R5 101
DS1775R6 110
DS1775R7 111

The DS1775 offers thermostatic functionality with over-temperature (TOS) and under-temperature (THYST) 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 TOS and it remains active until the temperature falls below THYST.

The DS1775 is functionally compatible with the DS75 and the LM75.
DS1775, DS1775R: Block Diagram DS1775, DS1775R: Block Diagram Enlarge+

Key Features

  • Temperature Measurements Require No External Components
  • Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
  • ±2.0°C Thermometer Accuracy
  • Thermometer Resolution is Configurable from 9 Bits to 12 Bits (0.5°C to 0.0625°C Resolution)
  • User-Definable Thermostat Settings
  • Data is Read From/Written to Through a 2-Wire Serial Interface
  • 2.7V to 5.5V Wide Power-Supply Range
  • Software Compatible with DS75 2-Wire Thermal Watchdog in Thermometer Mode
  • Space-Conscious 5-Pin SOT23 Package with Low Thermal Time Constant


  • Computer Graphics Systems
  • Industrial Instruments
  • Notebook Computers
  • Portable Terminals
  • Storage Area Networks (SANs)

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Multi DroppableOper. Temp.
See Notes
DS1775 Local2-Wire/I2C/SMBusOne2NoProgrammable
Yes-55 to +125
$0.97 @1k

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.

Additional Resources

Temperature Family by Product Type
Request Reliability Report for: DS1775R 
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.

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