EFM8BB2 Datasheet, PDF (48/55 Pages) Silicon Laboratories – The EFM8BB2 highlighted features are listed below

9. QFN20 Package Specifications
9.1 QFN20 Package Dimensions
EFM8BB2 Data Sheet
QFN20 Package Specifications
Figure 9.1. QFN20 Package Drawing
Dimension
A
A1
A3
b
c
D
D2
e
Table 9.1. QFN20 Package Dimensions
Min
Typ
0.70
0.75
0.00
0.02
0.20 REF
0.18
0.25
0.25
0.30
3.00 BSC
1.6
1.70
0.50 BSC
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Max
0.80
0.05
0.30
0.35
1.80
Rev. 1.1 | 47