SENSIRION SCD4 Series, Manual, Page: 1 / 24

www.sensirion.com Version 1.3 – September 2022 1/24
▪ High accuracy: ±(40 ppm + 5 %)
▪
Digital I
2
C interface
▪
Integrated temperature and humidity sensor
▪
Low power operation down to < 0.4 mA avg.
@ 5 V, 1 meas. / 5 minutes
SCD4x
Breaking the size barrier in CO
2
sensing
Products Details
SCD40-D-R2 Base accuracy, specified range
400 – 2’000 ppm
SCD41-D-R2 High accuracy, specified range
400 – 5’000 ppm, single shot
mode supported
SCD42-D-R2 Separate datasheet, see
https://sensirion.com/products/cat
alog/SCD42/
Full product list on page 22
Functional Block Diagram
Device Overview
Product Summary
The SCD4x is Sensirion’s next generation miniature CO
2
sensor. This sensor builds on the photoacoustic NDIR
sensing principle and Sensirion’s patented PA Sens® and
CMOSens® technology to offer high accuracy at an
unmatched price and smallest form factor. 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 build-in SHT4x humidity
and temperature sensor.
CO
2
is a key indicator for indoor air quality as high levels
compromise humans’ cognitive performance 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 maintaining low CO
2
concentration for a healthy,
productive environment.
Features
▪
Photoacoustic NDIR sensor technology PASens®
▪
Smallest form factor: 10.1 x 10.1 x 6.5 mm
3
▪ Reflow solderable for cost effective assembly
▪ Large output range: 0 ppm – 40’000 ppm
▪ Large supply voltage range: 2.4 – 5.5 V