EFM8SB1 Datasheet, PDF (42/55 Pages) Silicon Laboratories – The EFM8SB1 highlighted features are listed below

8.2 QFN20 PCB Land Pattern
EFM8SB1 Data Sheet
QFN20 Package Specifications
Dimension
C1
C2
C3
C4
E
X1
X2
X3
Y1
Y2
Y3
Figure 8.2. QFN20 PCB Land Pattern Drawing
Table 8.2. QFN20 PCB Land Pattern Dimensions
Min
Max
2.70
2.70
2.53
2.53
0.50 REF
0.20
0.30
0.24
.034
1.70
1.80
0.50
0.60
0.24
0.34
1.70
1.80
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