Datasheet

ManualsBrandsST ManualsEmbedded Processors & ControllersMicrocontroller 32bit 128KB LQFP
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DocID028800 Rev 1 173/200
STM32L431xx Package information
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Figure 46. UFBGA100 - 100-ball, 7 x 7 mm, 0.50 mm pitch, ultra fine pitch ball grid 
array 
package recommended footprint
 
Device marking
The following figure gives an example of topside marking orientation versus ball A1 identifier 
location.
F 0.700 0.750 0.800 0.0276 0.0295 0.0315 
ddd  - -  0.100  - -  0.0039
eee - - 0.150 - - 0.0059 
fff - - 0.050 - - 0.0020 
1. Values in inches are converted from mm and rounded to 4 decimal digits.
Table 91. UFBGA100 recommended PCB design rules (0.5 mm pitch BGA) 
Dimension Recommended values
Pitch 0.5
Dpad 0.280 mm
Dsm
0.370 mm typ. (depends on the soldermask 
registration tolerance)
Stencil opening 0.280 mm
Stencil thickness Between 0.100 mm and 0.125 mm
Table 90. UFBGA100 - 100-ball, 7 x 7 mm, 0.50 mm pitch, ultra fine pitch ball grid array 
package mechanical data (continued)
Symbol
millimeters inches
(1)
Min. Typ. Max. Min. Typ. Max.
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