SGP40-D-R4 Indoor Air Quality Sensor

SGP40-D-R4 Indoor Air Quality Sensor


Sensirion’s SGP40 VOC sensor is designed for air purifiers or demand-controlled ventilation

The SGP40 is Sensirion’s digital volatile organic compounds (VOC) sensor designed for easy integration into air treatment devices and air quality monitors. Based on Sensirion’s CMOSens® technology, the SGP40 offers a complete sensor system on a single chip and features a digital I²C interface, a temperature-controlled micro-hotplate, and a humidity-compensated indoor air quality signal. In combination with Sensirion’s powerful VOC algorithm, the sensor signal can be directly used to evaluate indoor air quality for applications such as triggering the gradual fan control of an air treatment device. Both the SGP40 chip and VOC algorithm feature unrivaled robustness in the final application over their lifetimes. Pushing the multi-pixel and multi-hotplate approach to the next level of individual control of each sensing element, the SGP40 enables a drastic reduction in power consumption, making it suitable for battery-driven applications as well. Sensirion’s state-of-the-art production process guarantees high reproducibility and reliability.


  • Interface: I²C
  • Supply voltage range: 1.7 V to 3.6 V
  • Current consumption: 2.6 mA to 3.5 mA (at 3.3 V or 1.8 V, respectively)
  • Measurement range: 0 ppm to 1,000 ppm of ethanol equivalents
  • Sensor output: digital 16-bit raw signal
  • Processed output: digital VOC index signal
  • Response time: <10 s (tau 63%)
  • Limit of detection: <0.05 ppm of ethanol equivalents or <10% of concentration setpoint (whichever is larger)
  • Switch-on time: <60 s
  • On-chip humidity compensation: yes


  • Air purifiers
  • Kitchen hoods
  • Demand-controlled ventilation
  • Thermostats
  • Indoor air quality monitoring

more information:

About mixos

Mike is the founder and editor of, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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