EFM8BB1 Datasheet, PDF (36/46 Pages) Silicon Laboratories – The EFM8BB1 highlighted features are listed below

8. QFN20 Package Specifications
8.1 QFN20 Package Dimensions
EFM8BB1 Data Sheet
QFN20 Package Specifications
Figure 8.1. QFN20 Package Drawing
Table 8.1. QFN20 Package Dimensions
Dimension
A
A1
b
c
D
D2
e
E
E2
f
L
L1
aaa
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Min
0.50
0.00
0.20
0.27
1.6
1.6
0.3
0.00
—
Typ
0.55
0.02
0.25
0.32
3.00 BSC
1.70
0.50 BSC
3.00 BSC
1.70
2.53 BSC
0.40
—
—
Max
0.60
0.05
0.30
0.37
1.8
1.8
0.5
0.10
0.05
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