High-Precision Digital Thermometer and Thermostat

Improved LM75/DS75 Software-Compatible Temperature Sensor Is ±0.5°C Accurate and Has Nonvolatile Thermostat Thresholds

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The DS7505 low-voltage (1.7V to 3.7V) digital thermometer and thermostat provides 9-, 10-, 11-, or 12-bit digital temperature readings over a -55°C to +125°C range with ±0.5°C accuracy over a -0°C to +70°C range. A 9-bit resolution mode is software compatible with the LM75.

The DS7505 thermostat has a dedicated open-drain output (O.S.) and programmable fault tolerance, which allows the user to define the number of consecutive error conditions that must occur before O.S. is activated. There are two thermostatic operating modes that control thermostat operation based on user-defined trip points (TOS and THYST) that are stored in EEPROM registers.
DS7505: Block Diagram DS7505: Block Diagram Enlarge+

Key Features

  • Extends Performance Range with a Low-Voltage, 1.7V to 3.7V Operating Range
  • Maximizes System Accuracy in Broad Range of Thermal Management Applications
    • Measures Temperature from -55°C to +125°C (-67°F to +257°F)
    • ±0.5°C Accuracy Over a 0°C to +70°C Range
    • User-Configurable Resolution from 9 Bits (Default) to 12 Bits (0.5°C to 0.0625°C Resolution)
  • Reduces Cost with No External Components and Stand Alone Thermostat Capability
  • Increases Reliability and System Robustness
    • Internally Filtered Data Lines for Noise Immunity (50ns Deglitch)
    • Bus Timeout Feature Prevents Lockup on a 2-Wire Interface
  • Simplifies Distributed Temperature-Sensing Applications with Multidrop Capability
    • Up to Eight Devices Can Operate on a 2-Wire Bus
  • Fast 25ms (max) 9-Bit Conversion Time
  • Flexible and Nonvolatile (NV) User-Defined Thermostatic Modes


  • Any Thermally Sensitive System
  • Cellular Base Stations
  • Medical Equipment
  • Networking Equipment
  • Office Equipment

See parametric specs for Temperature Sensors (113)

Part NumberSensor TypeFunctionsInterfaceChannelsAccuracy
Parasite Pwr.Temp. Thresh.Temp. Resolution
Multi DroppableOper. Temp.
See Notes
DS7505 LocalStandalone Thermostat2-Wire/I2C/SMBusOne0.5NoProgrammable (NV)
Yes-55 to +125
SOIC (N)/8
$1.38 @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.
Product Reliability Reports: DS7505.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.

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