SENSIRION Gas Detection Sensor, Carbon Dioxide, 40000 ppm, PAsens CMOSens SCD4x Series


The SCD4x is Sensirion’s next-generation miniature CO2 sensor. This sensor builds on the photoacoustic sensing principle and Sensirion’s patented PAsens® and CMOSens® technology to offer high accuracy at an unmatched price and smallest form factor.

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SMD assembly allows cost- and space-effective integration of the sensor combined with maximal freedom of design. On-chip signal compensation is realized with the built-in SHT4x humidity and temperature sensor.
CO2 is a key indicator for indoor air quality as high levels compromise humans’ cognitive low power and well-being. The SCD4x enables smart ventilation systems to regulate ventilation in the most energy-efficient and human-friendly way. Moreover, indoor air quality monitors and other connected devices based on the SCD4x can help maintain low CO2 concentrations for a healthy, productive environment.
Integrated temperature and humidity sensor
Reflow solderable for cost-effective assembly
Photoacoustic sensor technology PASens

Smallest form factor 10.1 x 10.1 x 6.5 mm3
Large output range 0 ppm – 40’000 ppm
Large supply voltage range 2.4 – 5.5 V
High accuracy ±(40 ppm + 5 %) Digital I2C interface
Low power operation down to < 0.4 mA avg. @ 5 V, 1 meas. / 5 minutes


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