EFM8SB1 Datasheet, PDF (40/55 Pages) Silicon Laboratories – The EFM8SB1 highlighted features are listed below

8. QFN20 Package Specifications
8.1 QFN20 Package Dimensions
EFM8SB1 Data Sheet
QFN20 Package Specifications
Dimension
A
A1
b
b1
D
D2
e
e1
E
E2
L
Figure 8.1. QFN20 Package Drawing
Table 8.1. QFN20 Package Dimensions
Min
0.50
0.00
0.20
0.275
1.6
1.60
0.35
Typ
0.55
—
0.25
0.325
3.00 BSC
1.70
0.50 BSC
0.513 BSC
3.00 BSC
1.70
0.40
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Max
0.60
0.05
0.30
0.375
1.80
1.80
0.45
Rev. 1.2 | 39