Adafruit
Adafruit Sensirion SHT45 Precision Temp & Humidity with PTFE
· MPN: ADA6174
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 temp...
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. Featuring a PTFE membrane for protection against dust and water ingress, it's built for demanding environments and precision applications.
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
- PTFE Membrane – Protects the sensor against dust and water while allowing accurate humidity measurement
- 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
- 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
- Outdoor and industrial applications (PTFE protected)
Package Contents
- 1× Adafruit Sensirion SHT45 Precision Temperature & Humidity Sensor Breakout with PTFE
- 1× Header strip (soldering required for breadboard use)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
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