SCD41

Part: SCD40 (SCD4x family, SCD40-D-R2) — Sensirion

Type: Photoacoustic NDIR CO2 Sensor with integrated temperature and humidity sensor

Description: Miniature 10.1 x 10.1 x 6.5 mm photoacoustic NDIR CO2 sensor with I²C interface, 2.4–5.5 V supply, specified 400–2,000 ppm range at ±(50 ppm + 5% of reading) accuracy (SCD40).

Operating Conditions:

• Supply voltage: 2.4–5.5 V (3.3 V or 5.0 V typical)
• Operating temperature: -10 to 60 °C
• Humidity: 0–95 %RH, non-condensing
• I²C SCL clock up to 400 kHz

Absolute Maximum Ratings:

• Max supply voltage: 6.0 V (min -0.3 V)
• Max voltage on SDA, SCL, GND: VDD + 0.3 V (min -0.3 V)
• Input current on SDA, SCL, GND: -280 mA to 100 mA
• Short term storage temperature: -40 to 70 °C
• ESD: HBM 2 kV, CDM 500 V

Key Specs:

• CO2 accuracy (SCD40, 400–2,000 ppm): ±(50 ppm + 5% of reading); output range 0–40,000 ppm
• CO2 repeatability: ±10 ppm typ.; response time τ63% 60 s typ.
• Humidity accuracy: ±6 %RH typ. (15–35 °C, 20–65 %RH); ±9 %RH typ. (-10 to 60 °C)
• Temperature accuracy: ±0.8 °C typ. (15–35 °C); ±1.5 °C typ. (-10 to 60 °C)
• Peak supply current: 175 mA typ., 205 mA max (VDD = 3.3 V); 115 mA typ., 137 mA max (5 V)
• Average supply current, periodic measurement (1 per 5 s): 15 mA typ., 18 mA max (3.3 V); 11 mA typ., 13 mA max (5 V)
• Average supply current, low power periodic mode (1 per 30 s): 3.2 mA typ., 3.5 mA max (3.3 V)
• Power-up time: 30 ms max; supply ripple: 30 mV pk-pk max
• Additional CO2 drift after five years with ASC: ±(5 ppm + 0.5% of reading) typ.

Features:

• Photoacoustic NDIR sensor technology PASens®
• Smallest form factor: 10.1 x 10.1 x 6.5 mm³
• Reflow solderable
• Digital I²C interface (address 0x62)
• Integrated SHT4x temperature and humidity sensor for on-chip compensation
• Automatic self-calibration (ASC) and forced recalibration
• Sensor lifetime >10 years; REACH and RoHS compliant

Applications:

• Indoor air quality monitors
• Smart ventilation systems
• Connected devices for CO2 monitoring

Package:

• LGA, 10.1 x 10.1 x 6.5 mm, MSL 3
• Tape & reel

• Photoacoustic NDIR sensor technology PASens®
• Smallest form factor: 10.1 x 10.1 x 6.5 mm 3
• Reflow solderable for cost-effective assembly
• Digital I 2 C interface
• Integrated temperature and humidity sensor

Table 4 : SCD4x electrical specifications

Stress levels beyond those listed in Table 5 may cause permanent damage to the device. Exposure to minimum/maximum rating conditions for extended periods may affect sensor performance and device reliability.

Table 5 : SCD4x operation conditions, lifetime and maximum ratings

6 Supply voltage must be kept constant for stable sensor operation.

7 Valid only for the supply voltage without the load of the sensor.

8 Refers to sustained current.

9 On-demand measurement with freely adjustable interval. See Section 3.10.

10 Accuracy can be reduced at relative humidity levels lower than 10%.

11 Short term storage refers to temporary conditions during e.g., transport.

12 For proper function of the ASC field-calibration algorithm, the SCD4x must be exposed to air with CO2 concentrations of 400 ppm on a weekly basis.

13 Sensor tested over simulated lifetime of >10 years for indoor environment mission profile.

Figure 3 schematically displays the package outline, as well as key nominal dimensions and their tolerances in millimeters. The notched corner of the protection membrane serves as a polarity mark to indicate the location of pin 1. Note that the white protection membrane on top of the sensor must not be removed or tampered with to ensure proper sensor operation. The weight of the sensor is approx. 0.6 g.

Figure 3 : Packaging outline drawing of the SCD4x: (left) top view and (right) side view. Dimensions are given in millimeters.

Figure 3 schematically displays the package outline, as well as key nominal dimensions and their tolerances in millimeters. The notched corner of the protection membrane serves as a polarity mark to indicate the location of pin 1. Note that the white protection membrane on top of the sensor must not be removed or tampered with to ensure proper sensor operation. The weight of the sensor is approx. 0.6 g.