3.3v I2C SHT45 Temperature And Humidity Sensor

Electrical Characteristics

Typical Operating Voltage: 3.3 V
Current Consumption (Typical):

• 0.4 µA at 1 measurement per second

• 80 nA in idle/sleep mode
  I²C Address:

• Default: 0x44

• Optional Alternate: 0x45
  I²C Speed:

• Standard, Fast, Fast Mode Plus (up to 1 MHz)
  Logic Level Compatibility: 1.8–3.3 V devices
  Heater: Integrated low-power heater (multiple power levels)

Temperature Measurement Specifications

Measurement Range: –40 °C to +125 °C
Typical Accuracy: ±0.1 °C
Max Accuracy Deviation: ±0.2–0.3 °C (depending on temperature)
Resolution: 0.01 °C
Repeatability:

• High repeatability: ±0.04 °C

• Medium: ±0.07 °C

• Low: ±0.10 °C
  Response Time (τ63%): ~2 seconds
  Long-Term Drift: < 0.03 °C per year

Humidity Measurement Specifications

Measurement Range: 0 %RH to 100 %RH
Typical Accuracy: ±1.0 %RH
Max Accuracy Deviation: ±1.5 %RH (varies by RH range)
Resolution: 0.01 %RH
Repeatability:

• High repeatability: ±0.05 %RH

• Medium: ±0.08 %RH

• Low: ±0.12 %RH
  Hysteresis: ±1 %RH
  Response Time (τ63%): ~8 seconds (in still air)
  Long-Term Drift: < 0.25 %RH per year
  Condensation Handling: Fully functional even in condensing conditions

Additional Features

• Factory calibrated (temperature & humidity)

• On-chip digital signal processing

• CRC checksum for robust data transmission

• Integrated heater for sensor recovery in high humidity

• Ultra-low power design for battery applications

• High stability and low drift

• ISO 17025-calibrated (3-point calibration)

Physical Characteristics

Typical Breakout Board Size:

• ~25.5 mm × 17.7 mm (varies by manufacturer)

• Weight: ~1–2 g

• Includes pull-up resistors and JST-SH Qwiic/StemMA connector (optional)

Operating Environment

• Fully operational from –40 to +125 °C

• Maintains accuracy between 5–60 °C and 20–80 %RH

• Can withstand prolonged high humidity

• Resistant to contamination and aging when handled properly