Datasheet

Table Of Contents
Package information STM32F405xx, STM32F407xx
166/202 DocID022152 Rev 8
Device marking for WLCSP90
The following figure gives an example of topside marking and ball A1 position identifier
location.
Other optional marking or inset/upset marks, which depend on supply chain operations, are
not indicated below.
Figure 77. WLCSP90 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 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.
Table 91. WLCSP90 recommended PCB design rules
Dimension Recommended values
Pitch 0.4 mm
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
06Y9
%DOO$
LQGHQWLIHU
3URGXFWLGHQWLILFDWLRQ
)2(%
5
5HYLVLRQFRGH
'DWHFRGH
<::