AHT21

The AHT21 is a high-precision digital temperature and humidity sensor designed for various applications, including HVAC, industrial automation, and environmental monitoring. It combines excellent accuracy with low power consumption, making it suitable for battery-operated devices. The sensor features a compact design and communicates via I2C or UART interfaces, allowing for easy integration into microcontroller-based projects.
With an operating range of -40 to 85°C for temperature and 0 to 100% relative humidity, the AHT21 provides reliable measurements under diverse conditions. Its built-in calibration ensures consistent performance over time. The sensor is particularly valued for its fast response times and resilience to environmental factors, making it ideal for applications in smart homes, weather stations, and data loggers.
Overall, the AHT21 is a versatile solution for those seeking accurate and efficient monitoring of temperature and humidity levels in various settings.

The AHT21 is a high-accuracy digital humidity and temperature sensor known for its robust performance and versatility. Key features include:
1. High Accuracy: Provides ±2% RH and ±0.3°C temperature accuracy, ensuring reliable measurements.
2. Wide Range: Operates within a humidity range of 0% to 100% RH and a temperature range of -40°C to 85°C.
3. Fast Response Time: Quick response to changes in environmental conditions, ideal for dynamic applications.
4. Digital Output: Communicates via I2C interface, making it easy to integrate into microcontroller systems.
5. Low Power Consumption: Designed for energy efficiency, suitable for battery-powered devices.
6. Compact Size: Small footprint facilitates integration into various designs without significant space constraints.
7. Long-Term Stability: Offers good stability over time, minimizing the need for frequent recalibration.
8. Versatile Applications: Suitable for HVAC, weather stations, industrial automation, and consumer electronics.
Overall, the AHT21 is an excellent choice for applications requiring precise humidity and temperature monitoring.

The AHT21 is typically available in a compact, surface mount package type, specifically a 4x4 mm DFN (Dual Flat No-lead) package. This design allows for easy integration into various electronic applications while ensuring efficient thermal performance and minimal space usage.

The AHT21 is a digital humidity and temperature sensor with a total of 4 pins.
1. VCC: This pin is the power supply input, typically requiring a voltage of 3.3V to 5V.
2. GND: This pin is the ground connection.
3. SDA: This is the Serial Data Line for I2C communication, used for data transmission between the sensor and a microcontroller.
4. SCL: This is the Serial Clock Line for I2C communication, used to synchronize data transfer.
The AHT21 provides accurate measurements of relative humidity and temperature, making it suitable for various applications, including HVAC systems, weather stations, and environmental monitoring. The sensor communicates using the I2C protocol, allowing for easy integration with many microcontrollers and development platforms.

The AHT21 is manufactured by AHT Cooling Systems GmbH, a company based in Austria. AHT specializes in the development and production of high-quality refrigeration and air conditioning technologies. The company focuses on providing innovative solutions for the retail and food service industries, particularly in the areas of commercial refrigeration and climate control. AHT is known for its commitment to energy efficiency and environmentally friendly practices, offering products that help businesses reduce their carbon footprint while maintaining optimal performance in temperature-sensitive applications.

The AHT21 is a digital temperature and humidity sensor used in various applications, including HVAC systems, weather stations, industrial automation, agricultural monitoring, and smart home devices. Its precise measurements help optimize environmental conditions in buildings, enhance comfort, and improve energy efficiency. Additionally, it is utilized in food storage, pharmaceuticals, and climate-controlled environments to ensure product integrity.

Equivalent products to the AHT21 chip include the SHT20, SHT31, and SHT40 from Sensirion, as well as the HTU21D from TE Connectivity. These sensors offer similar temperature and humidity measurement capabilities, with variations in accuracy, range, and communication interfaces. Always check the specific datasheets for detailed specifications and compatibility.