Figure 45. Wlcsp64, 0.400 Mm Pitch Package Top View Example - STMicroelectronics STM32L151QCH6 Manual

Package information
Marking of engineering samples
The following figure gives an example of topside marking orientation versus ball A1 identifier
location.
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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Figure 45. WLCSP64, 0.400 mm pitch package top view example

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STM32L151xC/C-A STM32L152xC/C-A