www.sensirion.com

Version 1 – March 2022

18/21

4 Mechanical specifications

4.1 Package Outline

Figure 3 schematically displays the package outline. The notched corner of the protection membrane serves as a polarity

mark to indicate pin 1 location. Nominal dimensions and tolerances are listed in Table 27.

Figure 3: Packaging outline drawing of the SCD42: (left) top view and (right) side view. Nominal

dimensions and tolerances are listed in millimeters.

Dimension

a

b

c

d

e

f

Nominal [mm]

10.1

10.1

8.5

7.8

5.5

0.8

Tolerance [mm]

± 0.3

± 0.3

± 0.2

± 0.2

± 0.3

± 0.2

Table 27: Nominal dimensions and tolerances SCD42 (all in mm). The weight of the sensor is approx.

0.6 g.

Note that the white protection membrane on top of the sensor must not be removed or tampered with to ensure proper sensor

operation.

4.2 Land Pattern

Recommended land pattern, solder paste and solder mask are shown in Figure 4. These are recommendations only and not

specifications. The exact mask geometries, distances and stencil thicknesses must be adapted to the customer soldering

processes.

Figure 4: SCD42 footprint (top view): landing pads (a), solder mask (b) and solder paste (c).