SENSIRION × GnK SOLUTIONS
Sensingthe invisible.
SHT40 · STS40 · DFN
1.5 mm
Swiss Sensirion specialises in humidity and temperature sensing, led by the SHT40 humidity and temperature sensor and the STS40 temperature sensor. Its portfolio also includes CO₂, particulate matter and flow sensors.
The air you can’t see.
Time08:00
08:00
Morning
Fresh air. CO₂ close to outdoor levels.
15:00
The air gets heavy
Every breath adds CO₂. The level climbs long before anyone notices.
16:00
Ventilate on demand
A sensor spots the rise and opens the air — only when it's needed.
Swiss precision, at scale.
- Founded as an ETH Zurich spin-off
- 1998
- Revenue in 2025
- CHF342.4M
- People worldwide
- 1280
- IATF 16949 automotive quality since
- 2008
“One in two cars has Sensirion sensors onboard.”
Sensors that keep cars safe.
From the cabin air to the battery pack, Sensirion sensors watch the conditions that affect comfort and safety.
LiDAR & camera protection
SHT4xADetects water and condensation getting into LiDAR and camera housings before they fail.
Five ways to measure the air.
01
Capacitive humidity
Water molecules change the capacitance between two electrodes.
02
Photoacoustic CO₂
Infrared light makes CO₂ molecules vibrate; a tiny microphone hears the pressure waves.
03
Laser-scattering particles
Particles crossing a laser beam scatter light onto a photodiode.
04
Metal-oxide VOC · NOx
Gases change the resistance of a heated metal-oxide layer.
05
Thermal flow
Flow carries heat from a tiny heater toward one temperature sensor.
It hears CO₂.
Exterior based on Sensirion CAD. Internal components are simplified illustrations.
01 · Membrane
Air in, dust out
A white membrane lets gas through and keeps dust and water away.
02 · Light
An infrared pulse
A tiny emitter flashes infrared light into the optical cavity.
03 · Sound
Molecules vibrate
CO₂ absorbs the light and warms up, sending out faint pressure waves.
04 · Chip
A microphone listens
A MEMS microphone picks up the waves and the CMOSens® chip turns them into ppm.
Real parts. Real sizes.
Four Sensirion families in 3D at their true dimensions — from a 1.5 mm humidity sensor to a 41 mm particulate module.
Select a part to look closer
Humidity & temperature
SHT40 · SHT41 · SHT43 · SHT45 · SHT4xA · STS40
Key specs
- CMOSens® capacitive humidity + band-gap temperature
- SHT40: ±1.8 %RH · ±0.2 °C · STS40: ±0.2 °C
- I²C · 1.08–3.6 V
Size
DFN 1.5 × 1.5 × 0.5 mm
More from Sensirion
Environmental node
SEN62 · SEN63C · SEN65 · SEN66 · SEN68 · SEN69C
Particles, humidity, temperature, VOC, NOx, CO₂ and formaldehyde across one module family, all seven together in the SEN69C.
VOC · NOx
SGP41 · SGP40
MOXSens® metal-oxide sensor with VOC and NOx Index output.
Formaldehyde
SFA30 · SFA40
Electrochemical sensor with anti-dry technology for a long life.
Liquid flow
SLF3x
Thermal flow sensing in a straight channel with no moving parts.
Gas flow
SFM3304-D · SFM3505
Thermal mass flow for ventilators and respiratory devices.
In the air around you, every day.
01
HVAC · indoor air quality
Thermostats and air-quality monitors that ventilate on demand.
02
Automotive cabin
Cabin sensors that keep the air fresh and the windshield clear.
03
ADAS protection
Humidity sensors that protect LiDAR and cameras from water.
04
EV battery safety
Battery-pack sensors that watch for thermal runaway and water ingress.
05
Medical · respiratory
Flow and pressure sensors in ventilators and CPAP devices.
06
Smart home
Air purifiers and smart-home devices that react to the air.
07
Industrial · life sciences
Flow sensors in lab instruments and semiconductor tools.
08
Energy · refrigerant safety
Refrigerant leak detection for the next generation of heat pumps.
Genuine parts, local support.
SENSIRION, CMOSens, PASens and MOXSens are trademarks of Sensirion AG.
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Test & measurement
Tektronix
The company that set the standard for oscilloscopes.Talk to us about Sensirion
Tell us the sensor and quantity you need — an engineer gets back to you with availability and design-in help.