AHT21 Integrated temperature and humidity sensor -40 ~ + 120 ℃

SKU: rz24317149
In Stock


  1. Supply voltage: DC : 2.2 – 5.5V
  2. Measuring range (humidity): 0 ~ 100% RH
  3. Measuring range (temperature): -40 ~ + 120 ℃
  4. Humidity accuracy: ± 2 % RH ( 25 ℃ )
  5. Excellent long-term stability
  6. SMD package is suitable for reflow soldering
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As a new generation of temperature and humidity sensors, AHT21 sets a new standard in terms of size and performance: a two-row flat pinless SMD package suitable for real flow soldering, bottom face 3x3mm, height 0.8mm. The sensor outputs calibrated digital signals in standard IIC format.

AHT21 is equipped with a newly designed ASIC dedicated chip, an improved MEMS semiconductor capacitive humidity sensor element and a standard on-chip temperature sensor element. Its performance has been greatly improved or even exceeded the reliability level of the previous generation of sensors. A generation of temperature and humidity sensors have been improved to make their performance more stable in harsh environments.

Each sensor is calibrated and tested, and the product lot number is printed on the surface of the product. Due to improvements and miniaturization of the sensor, it is more cost-effective, and ultimately all devices will benefit from cutting-edge energy-saving operation modes.


  1. Fully calibrated
  2. Digital output, I²C interface
  3. Excellent long-term stability
  4. SMD package is suitable for reflow soldering
  5. Quick response and strong anti-interference ability

Package Includes:

1 x Temperature and Humidity Sensor Model AHT21

Additional information

Input Voltage Range(VDC)

2.2 – 5.5V

Measuring range (humidity)

0 ~ 100% RH

Measuring range (temperature)

-40 ~ + 120 ℃

Humidity accuracy

± 2 % RH ( 25 ℃ )

Temperature accuracy

± 0.3 ℃

Resolution temperature

0.01℃ Humidity: 0.024%RH

Signal Output

I2C signal