EFM8BB1 Datasheet, PDF (38/46 Pages) Silicon Laboratories – The EFM8BB1 highlighted features are listed below

8.2 QFN20 PCB Land Pattern
EFM8BB1 Data Sheet
QFN20 Package Specifications
Dimension
D
D2
e
E
E2
f
GD
GE
W
X
Y
ZE
ZD
Figure 8.2. QFN20 PCB Land Pattern Drawing
Table 8.2. QFN20 PCB Land Pattern Dimensions
Min
Max
2.71 REF
1.60
1.80
0.50 BSC
2.71 REF
1.60
1.80
2.53 BSC
2.10
—
2.10
—
—
0.34
—
0.28
0.61 REF
—
3.31
—
3.31
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