Datasheet

Package information STM32L072xx
136/149 DocID027100 Rev 4
Device marking for WLCSP49
The following figure gives an example of topside marking versus ball A 1 position identifier
location.
Other optional marking or inset/upset marks, which depend on supply chain operations, are
not indicated below.
Figure 55. WLCSP49 marking example (package top view)
1. Parts marked as “ES”, “E” or accompanied by an Engineering Sample notification letter, 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 90. 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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