www.sensirion.com / D1

Version 2

– July 2021

13/17

Figure 10: Recommended land pattern

(in mm). Details can vary and depend on

used PCBs and solder processes. There

shall be no copper under the sensor

other than at the pin pads.

5.4 Pin Assignment & Laser Marking

Pin

Name

Comments

1

SDA

Serial data, bidirectional

2

SCL

Serial clock, unidirectional input

3

VDD

Supply voltage

4

VSS

Ground

Figure 11 Pin assignment (transparent top view). Dashed lines are only visible if sensor is viewed

from below. The die pad is not directly connected to any pin.

The laser marking consists of two lines, indicated in Figure 11. In the first line a filled circle serves

as pin-1 indicator

and is followed by “SH4”. The last character will indicate the accuracy class of

this product (here “x” serves as place holder). In the second line, the first three characters specify

the product characteristics according to positions 7,8 and 9 of Table 9. The second three

characters serve as internal batch tracking code.