SGP40 VOC Sensor
Experts in environmental sensing

VOC Sensor SGP40
The SGP40 is an integrated CMOSens® sensor system ona single chip based on a metal-oxide sensor. It provides
a humidity-compensated indoor air quality signal via a
digital I2C interface. By relying on Sensirion’s proven
MOXSens® Technology, the sensor’s unmatched robustness against contamination by siloxanes results in outstanding long-term stability in terms of sensitivity andresponse time. Pushing the sensing material and micro-­
hotplate technology to the next level, the SGP40 offers adrastic reduction in power consumption, making it suitable for battery-driven applications as well. Sensirion’sindustry-leading production processes guarantee highreproducibility and reliability.
Sensirion’s powerful VOC Algorithm analyzes VOC events detected by the SGP40 VOC sensor and maps them to a VOC
Index. This VOC Index provides a practical quantification of VOC events relative to each individual sensor’s averageindoor environment. In this way, it behaves similarly to the human nose, which is highly susceptible to changes in odor,
but it also detects VOC events that are not perceived by humans.
The VOC Index indicates to what extent the indoor air quality has deteriorated or improved compared to the sensor’s
average VOC environment. This information can be used, e.g., for gradually controlling the fan of an air treatment device
or to provide users with feedback on their daily activity profile.

Applications

Features

The SGP40 has been designed for use in various applica-

Both the SGP40 and VOC Algorithm offer distinguishingtions and devices, such as:features (detailed below) that help users assess and• Air purifiers

improve their air quality.

• Kitchen hoods• Demand-controlled ventilation

1. Complete sensor solution for detecting VOC events• Thermostats• Simple interface, powerful VOC Algorithm• Indoor air quality monitoring• Easy integration of driver package
2. Proven performance improved• 2nd generation• Low device-to-device variation under fieldor lab conditions• Fast start-up behavior
3. Reliable and accurate long-term user experience• Robust hardware• Stable and repeatable signal output over lifetime• Smart adaptation to any indoor environment

Technology and benefits
TechnologyBenefits

Excellent longevity of > 10 years

Reliable sensor hardware

VOC Index driverNo signal processing programming by customer required

On-chip humidity compensation

Optimal performance in various environments

Low heat emission

Enhanced precision of RH&T readings, less backgrounds

Small footprint

Fits into every device

High sensitivity to almost all VOCs

Broadband sensor that reacts well to typical VOCs

Average power consumption down to 2.6 mA / 6 mW

Suitable for battery-powered devices

Voltage range of 1.7 – 3.6 VSuitable for both mobile and hardwired devices

Digital I2C interface

Best performance-to-price ratio

Specifications
Gas Sensing Specifications
VOC Algorithm output

0 – 500 VOC Index points 1

Sensor raw output

16-bit ticks 2

Measurement range

0 – 1,000 ppm of ethanol equivalents

Device-to-device variation< ± 15 VOC Index points or % m.v. (whichever is larger)

Limit of detection< 0.05 ppm of ethanol equivalents or< 10 % of concentration setpoint (whichever is larger)

Response time (tau 63 %)< 10 sSwitch-on time

< 60 sElectrical Specifications12

Supply voltage range

1.7 – 3.6 V

Idle current

34 µACurrent consumption during operation at 1.8 Vat 3.3 V

3.5 mA
2.6 mAInterface

I2C

Sensirion’s VOC Algorithm processes the SGP40 raw signal externally into a ready-to-use air quality signal.
The SGP40 raw signal is proportional to the logarithm of MOX resistance.

SEK-SVM40 Evaluation Kit
The SEK-SVM40 evaluation kit has been designed for easy and cost-efficient evaluation of Sensirion’s SGP40 VOC sensor.
The kit contains the SVM40 sensor module and is equipped with an SGP40, a humidity and temperature sensor and amicrocontroller featuring VOC Index, relative humidity and temperature outputs via either an I2C or UART interface.
In addition to the SVM40, the SEK-SVM40 comes with aUART-USB cable that allows, e.g., for evaluation of thesensors by Sensirion’s easy-to-use SEK-ControlCenterviewer software as well as a 6-pin jumper wire cable thatenables fast prototyping, e.g., through integration intoexisting platforms (like Arduino, Raspberry Pi, etc.). Thesoftware and relevant documentation can be downloaded
from our website.
Learn more: www.sensirion.com/sek

Environmental sensing
Environmental conditions have a major impact on our well-­being, comfort, and productivity. Sensirion’s sensor solutions
provide detailed and reliable data on key environmental parameters such as humidity, temperature, volatile organic compounds (VOCs), particulate matter (PM2.5), formaldehyde and CO2. Environmental sensing opens up new possibilities tocreate smarter devices that improve our comfort and well-being as well as increase energy efficiency in a wide varietyof applications.
We accompany you through the entire product development process, from the initial idea to product launch and beyond.
Our expertise ranges from prototype construction, design-in support and use-case development to inline testing at themass production stage.

www.sensirion.com/sgp40