Datasheet

ManualsBrandsST ManualsEmbedded Processors & ControllersMicrocontroller 32bit 256KB UFQFPN
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Package information STM32L433xx
210/224 DocID028794 Rev 4
 
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 59. WLCSP49 marking (package top view)
1. Parts marked as ES or 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 111. WLCSP49 recommended PCB design rules (0.4 mm pitch) 
Dimension Recommended values
Pitch 0.4
Dpad 0.225 mm
Dsm
0.290 mm typ. (depends on the soldermask 
registration tolerance)
Stencil opening 0.250 mm
Stencil thickness 0.100 mm
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