The Adafruit Sensirion SHT45 is the highest-accuracy sensor in the SHT4x family, delivering ±1.0% typical relative humidity accuracy and ±0.1 °C typical temperature accuracy. This version does not include a PTFE membrane, making it suitable for clean indoor environments where dust and water protection is not required.

The breakout includes a voltage regulator and level shifting, making it compatible with both 3.3 V and 5 V systems. STEMMA QT / Qwiic connectors allow solderless hookup, and Arduino and CircuitPython libraries are available for quick integration.

Key Features

• Relative Humidity Accuracy – ±1.0% RH typical (25–75% RH) — best in the SHT4x family
• Temperature Accuracy – ±0.1 °C typical (0–75 °C) — best in the SHT4x family
• True I2C Interface – Address 0x44, fast mode plus with CRC checksum
• Ultra-Low Power – Ideal for battery-powered applications
• Variable Power Heater – Built-in heater for defogging and self-testing
• 3.3 V / 5 V Compatible – Onboard voltage regulator and level shifting
• STEMMA QT / Qwiic Connectors – Solderless I2C connection and daisy-chaining

Also Consider

• SHT45 with PTFE Membrane – Same precision sensor with dust and water protection for harsher environments
• SHT41 Sensor – Mid-range option with ±1.8% RH typical accuracy at lower cost
• SHT40 Sensor – Budget-friendly option with similar typical accuracy at 25–75% RH

Ideal For

• Precision environmental monitoring and calibration
• Scientific research and laboratory instruments
• HVAC and climate control systems requiring high accuracy
• Indoor data logging and weather stations

Package Contents

• 1× Adafruit Sensirion SHT45 Precision Temperature & Humidity Sensor Breakout
• 1× Header strip (soldering required for breadboard use)

Resources

• Adafruit SHT4x Guide (Arduino & CircuitPython)