Sensirion Launches SCD40: Ultra‑Miniaturized CO₂ and RH/T Sensor

During the 2019 Sensor+Test in Nuremberg and SensorsExpo in San José, Sensirion unveiled the SCD40—the industry’s first CO₂ and RH/T sensor that occupies only one cubic centimetre. Built on a photoacoustic sensing architecture, the SCD40 delivers uncompromised accuracy while dramatically shrinking the footprint, thereby unlocking a host of new integration opportunities. Its exceptional price‑performance balance makes it an ideal choice for high‑volume, cost‑sensitive deployments.

Measuring only 12 × 12 × 7 mm³, the SCD40 is five times smaller than its predecessor, the SCD30. The photoacoustic principle enables a compact optical cavity that preserves performance. Integrated with Sensirion’s flagship humidity and temperature sensor, the module offers three calibrated outputs—CO₂, RH, and temperature—without sacrificing space or cost. These attributes make the SCD40 the preferred sensor for emerging CO₂ markets across IoT, automotive, HVAC, consumer appliances, and beyond.

Modern buildings, while more energy‑efficient thanks to stricter standards and improved insulation, often suffer from reduced ventilation, leading to poorer indoor air quality. Elevated CO₂ concentrations directly affect occupant health and productivity, making CO₂ measurement a critical IAQ metric. Commercial and residential ventilation systems already employ CO₂ sensors to balance energy savings with occupant comfort. Additionally, CO₂ monitoring is integral to IAQ devices, air purifiers, and smart thermostats. The SCD40’s compact, low‑cost design enables designers to embed high‑accuracy CO₂ sensing into a wide range of products, opening new avenues for smarter, healthier environments.