• Megatrends

    • Indoor air quality

      The air we breathe is the basis of a healthy life: how to measure and improve it

    • Digital health

      Patient-focused sensor technology is shaping the future of healthcare

    • Autonomous Driving

      Monitoring water ingress to make safe autonomous driving a reality

    • Energy transition

      The energy transition is key to a sustainable future – driven by innovative technologies and smart solutions

  • Applications

      • Smart inhalers
      • Breath analyzers
      • Subcutaneous drug delivery
      • Mechanical ventilators
      • Infusion
      • Anesthesia machines
      • CPAP devices
      • Heart-lung machines
      • Nitric oxide therapy
      • Urine flow measurement
      • Battery energy storage systems
      • Chip mounters
      • Clean cooking
      • Combustion control
      • Front opening unified pods
      • Gas analyzers
      • Gas meters
      • Humidity in oil
      • Photoresist dosing
      • Surface coating/treatment
      • Gas purging
      • Transport of pharmaceutical goods
      • Transport of perishable goods
      • Bioreactors
      • Condition monitoring & instrument diagnostics
      • Custom manifold solutions
      • DNA sequencing
      • Flow cytometry
      • Gas chromatography
      • Liquid chromatography
      • Mass spectrometry
      • Microfluidics
      • Thermal analysis
      • Refrigerators
      • Demand-controlled ventilators
      • Room sensors
      • VAV controllers
      • Filter monitoring
      • Refrigerant leakage detection
      • Air conditioners
      • Air purifiers
      • Thermostats
      • Indoor air quality monitors
      • Smart speakers
      • Air intake
      • Antifogging
      • Brake-by-wire systems
      • Humanoid robots
      • H2 monitoring in fuel cells
      • LiDAR systems
      • Safety of electric vehicles
      • Steer-by-wire systems
  • Products

      • Find your product
      • Humidity
      • Temperature
      • VOCs/NOx
      • Formaldehyde
      • CO₂
      • Particulate matter
      • Refrigerants
      • Liquid flow
      • Differential pressure
      • Gas flow
      • Mass flow controllers
      • Gas metering solutions
      • Gas analyzers
      • Evaluation kits
      • ControlCenter
      • SEK-SensorBridge
      • Humidity/temperature
      • VOCs/NOx
      • Formaldehyde
      • CO₂
      • Particulate matter
      • Liquid flow
      • Differential pressure
      • Gas flow sensors
      • Mass flow controllers
      • Download center
      • Evaluation kits
      • Demonstrators and apps
      • FAQ
      • Support form
      • Distributors
      • GitHub
      • Developer website
      • Distributors' inventory
      • Distributors
      • Representatives
      • Partner access
      • Contact form
      • Customized sensors
      • Development
  • Career

      • Find your dream position
      • Working at Sensirion
      • Our locations
      • Our teams
      • Our entities
      • Professionals
      • Graduates
      • Students
      • Apprentices
      • News
      • Events
      • Newsletter
      • WhatsApp news
      • Employee stories
    • Contact our P&C Team
  • Company

      • Company profile
      • Locations
      • Contact
      • Sustainability compliance
      • Energy efficency
      • Improving health
      • Ensuring safety and comfort
      • Technology
      • Encouraging innovation
      • Quality and reliability
      • All news
      • Press releases & news
      • Specialist articles
      • Events
      • Webinars
      • Newsletter
      • At a glance
      • Share information
      • Ad-hoc news
      • Financial newsletter
      • Events
      • Results and reports
      • Annual general meeting
      • Corporate governance
      • Sustainability
    • We make the difference in sensing for a better world.

      Future innovations

Directly to

  • Support
  • Product catalog
  • Newsroom
  • Work at Sensirion
  • Technical downloads

Sensirion

  • Developers platform
  • Sensirion Automotive Solutions
  • Qmicro by Sensirion
  • Sensirion Connected Solutions

Contact us

  • General request
  • Support request
  • Newsletter registration

Legal notice© Sensirion AG

STS40

±0.2°C Ultra-low-power temperature sensor

The STS4x is Sensirion’s state-of-the-art, highly accurate digital temperature sensor series, boasting industry-leading lead times. It is a fully digital, highly cost-efficient temperature sensor platform that is available in different accuracy classes, currently represented by the STS40. The STS4x temperature sensor range features enhanced signal processing, three distinctive I²C addresses and communication speeds of up to 1 MHz. Moreover, the dual-flat no-leads (DFN) package has a footprint of only 1.5 × 1.5 mm² while retaining a height of 0.5 mm, which allows for an easy integration of the STS4x series into various applications. Additionally, the wide supply voltage range of 1.08 to 3.6 V and low current consumption of 0.4 µA for a typical average current at 1 measurement per second enables battery-driven designs. Taken together, the STS4x series achieves the greatest cost efficiency among comparable sensors on the market. Thanks to Sensirion’s CMOSens® Technology, the STS4x temperature sensor benefits from the high-tech engineering of a wide range of sensor components. It is designed for mass production, comes with a high signal-to-noise ratio and high process capability and is proven to be highly reliable and stable over the long term.

Distributor listContact sales

Specification

Temperature
Typ. temperature accuracy
0.2
0.2°C
Operating temperature range [°C]
-40 - 125
-40 - 125°C
Response time (τ63%)
2
2s
Generic
Supply voltage
1.08 - 3.6
1.08 - 3.6V
Average supply current
0.4
0.4uA
Interfaces
I²C
I²C
Size (LxWxH)
1.5 x 1.5 x 0.55
1.5 x 1.5 x 0.55mm
Packaging size
10000
10000pcs (T&R)

Downloads

Handling instructions STS

06/2025

File

158.0 KB

Application note06/2025PDF158.0 KB
Datasheet STS4x

02/2025

File

570.7 KB

Datasheet02/2025PDF570.7 KB
Design-in guide SHT/STS

04/2024

File

822.1 KB

Guide04/2024PDF822.1 KB
Design-in guide SHT/STS Chinese

06/2024

File

1.2 MB

Guide06/2024PDF1.2 MB
Arduino driver I2C STS4x

Link

SoftwareLink
Embedded drivers temperature

Link

SoftwareLink
Calibration certification SHT/STS

08/2021

File

110.4 KB

Certificate08/2021PDF110.4 KB
REACH and RoHS declaration SHT/STS

01/2025

File

109.5 KB

Certificate01/2025PDF109.5 KB
Temperature brochure Japanese

05/2025

File

1.4 MB

Flyer05/2025PDF1.4 MB
Temperature product flyer

10/2024

File

1.1 MB

Flyer10/2024PDF1.1 MB
Temperature product flyer Chinese

03/2025

File

1.2 MB

Flyer03/2025PDF1.2 MB

Smart sensors for your application

Sensirion's sensor solutions are used in a wide range of applications and markets. Our reliable environmental and flow sensors improve energy efficiency, increase health and ensure safety and comfort.

  • All products
  • Temperature
  • STS4x

Sensor evaluation

Buy the following products to evaluate this sensor

NameDescriptionSeriesCategory
SEK-SensorBridgeConnecting bridge with two sensor portsSEK-SensorBridge
SEK-STS40-CD1BTemperature evaluation kit STS40SEK-STS4xTemperature

SEK-SensorBridge

Connecting bridge with two sensor ports

SEK-SensorBridge

SEK-STS40-CD1B

Temperature evaluation kit STS40

SEK-STS4x

Temperature

Download the respective viewer software to start measuring

Go to download center

Start testing our sensors fast and easy with the evaluation kits

How to get started
  • Home
  • Products
  • Product catalog
  • STS40

Latest Temperature sensors

Explore
Automotive grade ±0.2°C temperature sensor with wettable flanks and I2C 0x45 address output
Upcoming

STS41A-BWLB

Automotive grade ±0.2°C temperature sensor with wettable flanks and I2C 0x45 address output

  • Sensor
  • Temperature
±0.4°C Ultra-low-power temperature sensor
Active

STS4L

±0.4°C Ultra-low-power temperature sensor

  • Sensor
  • Temperature
Automotive grade ±0.2°C temperature sensor with wettable flanks and I2C 0x44 address output
Upcoming

STS41A-AWLB

Automotive grade ±0.2°C temperature sensor with wettable flanks and I2C 0x44 address output

  • Sensor
  • Temperature
Temperature evaluation kit STS40
Active

SEK-STS40-CD1B

Temperature evaluation kit STS40

  • Evaluation kit
  • Temperature
±0.1°C (20-60°C) Digital temperature sensor
Active

STS35-DIS

±0.1°C (20-60°C) Digital temperature sensor

  • Sensor
  • Temperature
±0.3°C Digital automotive-grade temperature sensor
Active

STS31A-DIS

±0.3°C Digital automotive-grade temperature sensor

  • Sensor
  • Temperature
±0.2°C (0-90°C) Digital temperature sensor
Active

STS31-DIS

±0.2°C (0-90°C) Digital temperature sensor

  • Sensor
  • Temperature