VOC sensor for indoor air quality applications

SGP40 is a digital VOC (volatile organic compounds) sensor designed for easy integration into air treatment devices and air quality monitors. Based on our patented 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 our powerful VOC Algorithm (part of the gas index algorithm software), the sensor signal can be directly used to evaluate indoor air quality, e.g., for 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 multipixel 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. On top of that, the SGP40 is compliant with the relevant healthy building standards RESET® and WELL Building Standard™ – for more information please refer to the application note “Compliance of Sensirion’s VOC Sensors with RESET and WELL” below.


  • Sensor output: Two digital 16-bit raw signals
  • Processed output: 0-500 VOC Index
  • Measurement range: 0 – 1000 ppm
  • Response time (τ63%): < 10 s
  • Device-to-device var: ±15 % m.v.
  • Limit of detection: < 0.05 ppm of ethanol equivalents or < 10 % of concentration setpoint, whichever is larger
  • Switch-on time: 1h
  • On-chip humidity compensation: Yes
  • Supply voltage 1.7 – 3.6 V
  • Average supply current 2600 uA
  • Max. supply current 3000 uA
  • Interfaces I²C
  • Size (LxWxH) 2.44 x 2.44 x 0.85 mm³


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