AHT21: The New Generation of Industrial Grade Temperature And Humidity Sensor

AHT21, a new generation of temperature and humidity sensor produced by ASAIR, Aosong Electronics, is embedded in a dual-row flat leadless SMD package suitable for reflow soldering, with a bottom surface of 3x3mm and a height of 0.8mm. The sensor outputs a calibrated digital signal in a standard I²C format.

The previous version of AHT20 Temperature and Humidity Sensor also provides Industrial Grade features of improved MEMS semiconductor capacitive humidity sensor and a standard on-chip temperature sensor. The output is the I2C protocol with the Grove interface.

Temperature and humidity sensors are most common in various scenarios such as home appliances, medical care, industry, transportation, smart agriculture, smart farming, meteorology, infrastructure, smart homes, and smart properties. Let’s take a look at this new solution based on the AHT21 sensor and talk about its chip, specifications, and compatible application scenarios.

AHT21

Features

  • Fully calibrated
  • Digital output, I²C interface
  • Excellent long-term stability
  • SMD package is suitable for reflow soldering
  • Quick response and strong anti-interference ability

AHT21 is equipped with a newly designed ASIC dedicated chip, an improved 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, such as AHT20 (Introducing AHT20 I2C Temperature and Humidity Sensor- Industrial Grade). AHT21 temperature and humidity sensor is able to perform stably in extremely harsh environments more stable.

Specifications Comparision of AHT21 and AHT20

Compare with AHT20, AHT21 can detect a wider range of temperature from -40℃ to +120℃. AHT21 also has a smaller size, the height has been compressed to 0.8mm.

Supply voltage (DC)2.0-5.5V2.0 – 5.5V
Measuring range (temperature)-40~+120℃-40 ~ + 85 ℃
Measuring range (humidity)  0~100%RH 0 ~ 100% RH
Humidity accuracy±2%RH(25℃)± 2 % RH ( 25 ℃ )
Temperature accuracy±0.3℃± 0.3 ℃
Resolution temperature 0.01℃0.01℃
Resolution humidity0.024%RH0.024%RH
Output signalI²CI²C
SizeBottom surface of 3x3mm and a height of 0.8mmBottom surface of 3 x 3 mm and a height of 1.0 mm

Compatible application scenarios

AHT21 is recommended to be applied in:

  • HVAC
  • Dehumidifier testing, and inspection equipment
  • Consumer products that need to detect temperature and humidity,
  • Automobiles
  • Automatic control
  • Data loggers
  • Weather stations
  • Home appliances
  • Humidity adjustment
  • Medical and other related temperature and humidity detection and control.

Previous Version: AHT20

Grove – AHT20 I2C Industrial Grade Temperature and Humidity Sensor

Grove AHT20 Temperature and Humidity sensor is based on AHT20, a new generation of temperature and humidity sensor embedded with a dual-row flat and no-lead SMD package, suitable for the reflow soldering. AHT20 is equipped with a newly designed ASIC chip: an improved MEMS semiconductor capacitive humidity sensor, and a standard on-chip temperature sensor. The output is the I2C protocol with the Grove interface.

You can also check the blog Introducing AHT20 I2C Temperature and Humidity Sensor- Industrial Grade for more details and we introduced how fast Seeed can realize from idea to the final product.

Price$4.90
Temperature Range-40 – 85℃
Humidity Range± 2% RH (25 ℃)
Temperature accuracy± 0.3 ℃

Based on the temperature and humidity sensor AHT21 chip, Aosong Electronics also launched a series of temperature and humidity sensor module sensors-AHT21B, AM2301B, AM2311B, and other products. This series of sensors all offer stable performance, high accuracy, fast response speed, strong anti-interference ability, etc.

Based on the AM2301B temperature and humidity sensor: users can also customize products according to actual application scenarios and cost considerations by selecting chips, PCB boards, shells, protective covers, wires, etc.

To learn about more temperature sensor, we have introduced the following sensors in the blog 9 Types of Temperature Sensors You Should Know:

  • DHT11
  • DHT22/am2302
  • BMP280
  • BME280
  • DS18B20
  • AF5485
  • AM2311A
  • AHT20

Seeed Fusion Service delivers the customized solution

If you need the customized solution based on AHT21 temperature and humidity sensor chip, the Seeed Fusion turnkey PCB Assembly service has you covered:

  • One-stop assembly service: PCB Fabrication, components procurement, and assembly.
  • Over 150,000 components in the Seeed OPL, shorten the production time to just 7 working days.
  • FREE express shipping worldwide.
  • Free DFA (Design for Assembly) Review for all PCBA orders.
  • $0 operation fees for orders over 100 pieces.
  • Get a smart online quote from Seeed Fusion Now! www.seeedstudio.com/fusion_pcb.html

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