Datasheet

DocID025147 Rev 7 121/138
STM32F302x6 STM32F302x8 Package information
134
Device marking
The following figure gives an example of topside marking orientation versus ball A1 identifier
location.
Other optional marking or inset/upset marks, which identify the parts throughout supply
chain operations, are not indicated below.
Figure 39. WLCSP49 marking example (package top view)
1. Parts marked as ES or E are not yet qualified and therefore not approved for use in production. ST is not
responsible for any consequences resulting from such use. In no event will ST be liable for the customer
using any of these engineering samples in production. ST’s Quality department must be contacted prior to
any decision to use these engineering samples to run a qualification activity.
Table 78. WLCSP49 recommended PCB design rules (0.4 mm pitch)
Dimension Recommended values
Pitch 0.4
Dpad
260 µm max. (circular)
220 µm recommended
Dsm 300 µm min. (for 260 µm diameter pad)
PCB pad design Non-solder mask defined via underbump allowed.
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