SHT31 Digital Temperature Humidity Sensor

General Information:

• Model: SHT31
• Manufacturer: Sensirion
• Sensor Type: Digital humidity and temperature sensor
• Package: DFN8_2.5X2.5MM_EP, with a size of 2.5mm×2.5mm and a height of 0.9mm4.
• RoHS Compliance: Yes4.
• Automotive Grade: AEC - Q100 qualified4.

Electrical Characteristics:

• Supply Voltage (VDD): 2.15 - 5.5V1.
• Operating Current: < 1.5mA2.
• Standby Current: 1.7μA4.
• Interface: I²C, with a maximum communication speed of 1MHz1.

Measurement Performance:

• Temperature Measurement Range: -40 - 125°C1.
• Temperature Accuracy: ±0.2°C (at 0 - 90°C)2.
• Humidity Measurement Range: 0 - 100%RH2.
• Humidity Accuracy: ±2%RH (at 25°C)2.
• Response Time: 8s (humidity)4.
• Repeatability: ±0.1%RH (humidity), ±0.1°C (temperature).
• Hysteresis: < 1%RH.
• Long - Term Stability: < 1%RH/year.

Environmental Parameters:

• Operating Temperature: -40 - 125°C1.
• Storage Temperature: -50 - 150°C4.
• Operating Humidity: 0 - 100%RH (non - condensing).

Physical Dimensions:

• Package Size (L×W×H): 2.5mm×2.5mm×0.9mm4.
• Mounting Type: SMT4.

Interface Timing:

• Startup Time: -
• Measurement Cycle: -
• I²C Address: 0x44 or 0x45, which is determined by the ADDR pin connection2.
• Data Format: 16 - bit (MSB first) + 8 - bit CRC checksum.

1. Consumer Electronics:

• Smart Home Devices:Used in intelligent humidifiers, dehumidifiers, and automatic temperature/humidity regulation systems for air conditioners/fans, enabling smart control through real-time environmental parameter monitoring.
• Wearables & Health Monitoring:Integrated into smart watches and fitness bands to monitor body surface temperature and wearing environment humidity, assisting in sports health management (e.g., sweat status analysis).
• Household & Kitchen Appliances:Temperature/humidity monitoring for refrigerators, ovens, and food storage boxes to maintain optimal preservation conditions.

2. Industrial & Automation Control:

• Environmental Monitoring Systems:Real-time temperature/humidity monitoring in factory workshops and warehouses to ensure stable operating environments for precision instruments and electronic component storage.
• HVAC (Heating, Ventilation, and Air Conditioning):Regulates indoor comfort and optimizes energy consumption in commercial buildings by adjusting ventilation based on humidity.
• Industrial Equipment Condition Monitoring:Monitors internal temperatures of motors and switchgear to prevent overheating, or prevents corrosion in humid environments.

3. Automotive & Transportation:

• In-Vehicle Environment Control:Temperature/humidity sensing for car air conditioning systems to achieve automatic climate control, and integration with air quality management (e.g., defogging and air purification).
• Engine Compartment & Battery Monitoring:Temperature monitoring for new energy vehicle battery packs (ensuring safe charging and range), or humidity detection in engine intake systems.
• Automotive-Grade Compliance:Meets AEC-Q100 standards for long-term stable operation in vehicle electronics (e.g., dashboards, sensor modules).

4. Medical & Research:

• Medical Equipment & Environments:Temperature/humidity monitoring in hospital wards, incubators, and pharmaceutical storage cabinets (e.g., data logging for vaccine cold chain transportation).
• Laboratory & Research Equipment:Precise control of temperature/humidity chambers and climate simulation devices, or environmental parameter collection for biological experiments (e.g., plant growth, microbial culture).

5. Agriculture & Animal Husbandry:

• Greenhouse Cultivation:Monitors greenhouse temperature/humidity to automatically control ventilation and irrigation, optimizing crop growth conditions for vegetables and flowers.
• Livestock Farming:Environmental monitoring in farms to prevent mold in pigsties/coops and stress from extreme temperatures, improving breeding efficiency.

6. Meteorology & Outdoor Equipment:

• Portable Weather Stations:Temperature/humidity collection for handheld devices or small weather stations, used in outdoor operations, tourism, or disaster early warning.
• Outdoor Equipment Protection:Moisture monitoring for outdoor power distribution boxes and communication base stations to prevent damage from high humidity.

7. Special Industry Applications:

• Aerospace & Defense:Temperature/humidity monitoring in equipment compartments (meeting harsh environmental requirements) or UAV environmental sensing modules.
• Cultural Relic Protection:Environmental control in museums and archives to preserve antiques, calligraphy, and ancient books from moisture and dryness.

Core Advantages for Applications:

• High Precision & Stability:Temperature accuracy ±0.2°C and humidity ±2%RH make it suitable for scenarios requiring strict environmental control.
• Wide Temperature Range:Operates from -40°C to 125°C, adapting to extreme industrial and automotive environments.
• Low Power Consumption:Standby current as low as 1.7μA, ideal for battery-powered IoT devices (e.g., wireless sensors).
• Reliable Communication:I²C interface with CRC checksum ensures data integrity, supporting high-speed communication up to 1MHz.

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