Key benefits — why you need these sensors Reliable, compact sensing for indoor air quality and environmental control: combine accurate temperature/humidity data (AHT21) with multi-gas/VOC detection (ENS160) to make ventilation, filtration and automation smarter and safer. Easy integration and standard interface: both sensors provide a calibrated digital output compatible with standard I2C systems, reducing development time and simplifying connection to microcontrollers and building automation controllers. Small, production-ready hardware: AHT21’s embedded, lead‑free SMD package is designed for reflow soldering and tight spaces; ENS160 delivers broad VOC and gas detection in a single digital module. Improved long-term stability: AHT21 uses a newly developed ASIC and an improved semiconductor capacitive humidity sensor element with on‑chip humidity sensing that significantly improves reliability versus previous-generation devices. Product details and distinguishing attributes AHT21 (temperature and humidity sensor) Function: precise temperature and relative humidity measurement. Package and mounting: embedded, double row flat lead free SMD package for reflow soldering; bottom package footprint 3 x 3 mm, height 0.8 mm. Signal output: calibrated digital signal in standard I2C format. Technology and reliability: includes a newly developed ASIC and an improved semiconductor capacitive humidity sensor element with on‑chip humidity elements that greatly improve or exceed the reliability of previous generations. ENS160 (digital multi-gas sensor) Function: digital multi-gas sensor designed for indoor air quality detection and optimized for a wide range of gases and volatile organic compounds (VOCs). Detects: includes sensitivity to toluene, hydrogen, ethanol, No. 2 and other VOCs and gases relevant to indoor air quality monitoring. Signal output: calibrated digital signal in standard I2C format. Application focus: tuned for indoor environments (homes, offices, appliances, air purifiers) where detection of VOCs and common gases is needed for control or notification. Compatibility and performance notes Interface: Standard I2C digital communication enables direct integration with common microcontrollers, IoT modules, HVAC controllers, and building automation systems. Mounting and manufacturing: AHT21 is optimized for automated assembly (reflow soldering) with a compact lead‑free SMD footprint, reducing BOM complexity and board area. Use together: Combine AHT21 and ENS160 to provide a complete indoor environmental sensing solution—temperature, humidity and VOC/gas detection—from interoperable digital sensors. Practical use scenarios Smart HVAC or building automation: Use AHT21 for accurate temperature and humidity feedback and ENS160 to detect VOC spikes; automatically adjust ventilation rates to maintain comfort and reduce pollutant exposure while saving energy. Residential air purifiers and household appliances: Integrate ENS160 to trigger fan speed or filtration based on VOC levels and use AHT21 to control humidity-dependent features (e.g., humidifier/dehumidifier functions) with reliable on‑board sensing. Consumer IoT devices and compact electronics: The AHT21’s 3 x 3 mm, 0.8 mm SMD bottom package enables embedding in compact products (smart thermostats, wearable air monitors) while ENS160 provides gas/VOC awareness for indoor air-quality apps. Why these sensors stand out Combined sensing coverage (temperature, humidity, multi-gas/VOCs) supports more intelligent, automated responses for indoor air quality and consumer products. Standardized I2C output and compact, reflow-compatible packaging speed development and manufacturing. AHT21’s ASIC and improved sensor element deliver higher reliability and stability compared with prior generations, reducing maintenance and calibration needs. Available for applications including home and building automation, consumer goods, household appliances, and air purification systems.