EFM8UB2 Datasheet, PDF (35/50 Pages) Silicon Laboratories – The EFM8UB2 highlighted features are listed below

7. QFP48 Package Specifications
7.1 QFP48 Package Dimensions
EFM8UB2 Data Sheet
QFP48 Package Specifications
Figure 7.1. QFP48 Package Drawing
Dimension
A
A1
A2
b
D
D1
e
E
E1
L
aaa
bbb
Table 7.1. QFP48 Package Dimensions
Min
Typ
—
—
0.05
—
0.95
1.00
0.17
0.22
9.00 BSC
7.00 BSC
0.50 BSC
9.00 BSC
7.00 BSC
0.45
0.60
0.20
0.20
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Max
1.20
0.15
1.05
0.27
0.75
Rev. 1.2 | 34