I2C Digital Temperature & Humidity Sensor (AHT21)
New-generation AHT21 in a 3x3 mm reflowable package — calibrated I2C output for consumer, medical and industrial use.
- Material
- PCB & electronic components
- Age range
- 8+
- Category
- STEM Robotics & Electronics
- Customisation
- OEM & ODM available
Specifications, component counts and packaging are configurable. Figures shown reflect our standard configuration.
Key features
- Next-generation sensor in a 3 x 3 mm x 0.8 mm DFN SMD package suited to reflow soldering.
- New ASIC, improved MEMS semiconductor capacitive humidity element and standard on-chip temperature element exceed the previous generation's reliability.
- Every unit calibrated and tested, with batch number printed on the surface.
- More stable in harsh environments; improved miniaturization brings better value and cutting-edge energy-saving operation.
- Widely used in consumer electronics, medical, automotive, industrial and meteorology fields — HVAC, dehumidifiers, refrigerators, test and detection equipment.
Frequently asked about this product
Is the I2C Digital Temperature & Humidity Sensor (AHT21) compatible with Arduino, ESP32 and micro:bit?
Yes. The I2C Digital Temperature & Humidity Sensor (AHT21) talks over a standard I2C/SPI/UART bus at 3.3 V or 5 V logic, so it connects directly to Arduino (UNO/Nano/ Mega), ESP32, ESP8266 and micro:bit boards. Example sketches for Arduino IDE, Mixly and Mind+ are included, and the bus address can be reconfigured when several modules share one bus.
What voltage does the I2C Digital Temperature & Humidity Sensor (AHT21) run on?
The I2C Digital Temperature & Humidity Sensor (AHT21) runs from a standard 3.3-5 V DC supply (USB or the controller’s 5 V rail). It draws only a few milliamps in normal operation, so it is safe to power from the controller board itself for classroom builds.
What projects is the I2C Digital Temperature & Humidity Sensor (AHT21) good for?
The I2C Digital Temperature & Humidity Sensor (AHT21) is built for STEM and robotics education: classroom demonstrations, science-fair projects, robotics club builds and competition robots. It pairs with the rest of our module range — same connectors, same voltage, same toolchain — so students move from first circuit to competition robot without changing platforms.
What certification do the robotics and electronics products carry?
Controller boards, sensors and modules ship with CE marking and RoHS-compliant components, and the range is designed for classroom use under teacher supervision. Product-specific test reports and declarations of conformity are available for distributors on request.
What is the minimum order quantity, and can I get a sample first?
These are standard catalogue lines with stable production, so minimums are low and lead times are short. Samples ship within about a week and are normally credited against a first order. Mixed-SKU cartons are accepted for evaluation orders.
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Need pricing on this line?
Send your target quantity, destination market and any changes you need to artwork, colourway or packaging. We reply with a quotation and the applicable compliance route — usually within one working day.