EFM8UB2 Datasheet, PDF (43/50 Pages) Silicon Laboratories – The EFM8UB2 highlighted features are listed below

9. QFN32 Package Specifications
9.1 QFN32 Package Dimensions
EFM8UB2 Data Sheet
QFN32 Package Specifications
Dimension
A
A1
b
D
D2
e
E
E2
L
aaa
bbb
Figure 9.1. QFN32 Package Drawing
Table 9.1. QFN32 Package Dimensions
Min
Typ
0.80
0.85
0.00
0.02
0.18
0.25
5.00 BSC
3.20
3.30
0.50 BSC
5.00 BSC
3.20
3.30
0.35
0.40
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Max
0.90
0.05
0.30
3.40
3.40
0.45
0.10
0.10
Rev. 1.2 | 42