Datasheet

DS10668 Rev 6 111/126
STM32L031x4/6 Package information
120
UFQFPN28 device marking
The following figure gives an example of topside marking versus pin 1 position identifier
location.
Other optional marking or inset/upset marks, which depends assembly location, are not
indicated below.
Figure 48. Example of UFQFPN28 marking (package top view)
1. Parts marked as “ES”, “E” or accompanied by an Engineering Sample notification letter, are not yet
qualified and therefore not yet ready to be used in production and any consequences deriving from such
usage will not be at ST charge. In no event, ST will be liable for any customer usage of these engineering
samples in production. ST Quality has to be contacted prior to any decision to use these Engineering
samples to run qualification activity.
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