Humidity and Temperature Sensor SHT40

Sensirion sensor SHT40 is the first type of the 4th generation of humidity and temperature sensors for mobile and battery-driven applications. It builds on a completely new and optimized CMOSens® chip offering reduced current consumption and improved accuracy.

Sensor SHT40 can be considered the successor of SHTC3. The main differences are summarized in the table below:

Humidity and Temperature Sensor SHT40

Improved Accuracy

Humidity and Temperature Sensor SHT40

Reduced Power Consumption

When we compare the most accurate modes of SHTC3 (normal mode, repeatability 0.1% RH) and SHT40 (high repeatability mode, 0,08% RH), sensor SHT40 consumes only 2.3uA, which is 53% less than SHTC3. When both sensors run in the lowest power mode, SHT40 sensor consumes 20% less than SHTC3.

Extended Power Supply Voltage Range

SHT40 has input voltage range 1.08 to 3.6V, allowing to utilize the full capacity of 3V Li primary battery. In addition, several types of microcontrollers that can operate with a supply voltage from 0.9 V are already available on the market. This allows powering a device from a cheap 1,5V alkaline battery.

I2C Bus

Sensor SHT40 is available as SHT40-AD1B with I2C address 0x44 and SHT40-BD1B with I2C address 0x45. Therefore, it is possible to use two SHT40 sensors on the same I2C bus.

Full Water Condensation Robustness

If water condenses on the sensor surface, SHT40 will measure RH=100%. This seems natural, but for some competing sensors, water condensation will cause that the RH measured by the sensor drops to 0%.

Integrated Heaters

The sensor incorporates an integrated variable power heater which can be switched on by sending a command through I2C. The heater can remove condensed water from the sensor surface and also prevent measurement error caused by long-term operation in a high humidity environment, e.g. +3% RH after 60 hours at RH > 80%

How to Start with SHT40

You will need SEK-SHT40-AD1B-Sensors, SEK-SensorBridge and ControlCenter software for your Windows, Linux or Mac PC.

If you need more information about Sensirion products, please contact your SOS sales representative for your region or do not hesitate to contact us at sensirion@soselectronic.com, we will be happy to help.

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SEK-SensorBridge SENSIRION  
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Additional products

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in stock 13 pcs
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SEK-STC31 SENSIRION
STC31 and SHTC3 on FPC with Cable for SEK SensorBridge
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ESS-SGPC3-SHTC3 SENSIRION
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