Digital temperature sensor and thermal watchdog

The STDS75 is a high-precision CMOS (digital) temperature sensor IC with a delta-sigma analog-to-digital (ADC) converter and an I2C-compatible serial digital interface. It is targeted for general applications such as personal computers, system thermal management, electronics equipment, and industrial controllers, and is packaged in the industry-standard 8-lead TSSOP package.

The device contains a bandgap temperature sensor and programmable 9- to 12-bit ADC which monitor and digitize the temperature to a resolution up to 0.0625 °C. The STDS75 is typically accurate to (±3 °C - max) over the full temperature measurement range of –55 °C to 125 °C with ±2 °C accuracy in the –25 °C to +100 °C range. At power-up, the STDS75 defaults to 9-bit resolution for software compatibility with the STLM75.

The STDS75 is specified for operating at supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the supply current is typically (125 μA).

The onboard delta-sigma analog-to-digital converter (ADC) converts the measured temperature to a digital value that is calibrated in °C; for Fahrenheit applications a lookup table or conversion routine is required.

The STDS75 is factory-calibrated and requires no external components to measure temperature.

Key Features

  • Measures temperatures from –55 °C to +125 °C (–67 °F to +257 °F)
    • ±0.5 °C (typ) accuracy
    • ±2 °C (max) accuracy from –25 °C to +100 °C
  • Low operating current: 125 μA (typ)
  • No external components required
  • 2-wire I2 C/SMBus-compatible serial interface
    • Selectable serial bus address allows connection of up to eight devices on the same bus
  • Thermometer resolution is user-configurable from 9 (default) to 12 bits (0.5 °C to 0.0625 °C)
  • 9-bit conversion time is 150 ms (max)
  • Programmable temperature threshold and hysteresis set points
  • Wide power supply range - operating voltage range: 2.7 V to 5.5 V
  • Pin- and software-compatible with DS75 (drop-in replacement)
  • Power-up defaults permit standalone operation as thermostat
  • Shutdown mode to minimize power consumption
  • Separate open drain output pin operates as an interrupt or comparator/thermostat output (dual purpose event pin)
  • MSOP8 (TSSOP8) package

Circuit Diagram

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Technical Documentation

Product Specifications
Description Version Size
DS5156 DS5156: Digital temperature sensor and thermal watchdog 9.0 600 KB
Application Notes
Description Version Size
AN2680 AN2680: Fan speed controller based on STDS75 or STLM75 digital temperature sensor and ST72651AR6 MCU 1.4 125 KB

Publications and Collaterals

Description Version Size
STTS75 2.2 706 KB
Description Version Size
MEMS and Sensors, Smart solutions for IoT and enhanced user experience 1 MB

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Sample & Buy

Part Number Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STDS75DS2F ActiveMSOP/TSSOP 8IndustrialEcopack2 0 0

(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.