The mechanical specifications for the package shows the dimensions in millimeters.

QFN 4 x 4 mm package

Dimensions in millimeters for the QFN 4 x 4 mm package.

Figure 1. QFN 4 x 4 mm package
qfn 4 x 4 mm package
Table 1. QFN dimensions in millimeters
A A1 A3 b D E D2 E2 e K L
Min. 0.8 0 0.25 2.55 2.55 0.35
Nom. 0.85 0.035 0.203 0.3 4 4 2.65 2.65 0.65 0.4
Max. 0.9 0.05 0.35 2.75 2.75 0.45