Datasheet

ManualsBrandsST ManualsEmbedded Processors & ControllersMicrocontroller 32bit 256KB LQFP
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Package information STM32L476xx
256/270 DS10198 Rev 8
Figure 73. WLCSP72 - 72-ball, 4.4084 x 3.7594 mm, 0.4 mm pitch wafer level
chip scale package recommended footprint
 
Device marking
The following figure gives an example of topside marking orientation versus ball A1 identifier 
location.
aaa - 0.100 - - 0.0039 -
bbb - 0.100 - - 0.0039 -
ccc - 0.100 - - 0.0039 -
ddd - 0.050 - - 0.0020 -
eee - 0.050 - - 0.0020 -
1. Values in inches are converted from mm and rounded to 4 decimal digits.
2. Back side coating
3. Dimension is measured at the maximum bump diameter parallel to primary datum Z.
Table 129. WLCSP72 recommended PCB design rules (0.4 mm pitch BGA) 
Dimension Recommended values
Pitch 0.4 mm
Dpad 0.225 mm
Dsm
0.290 mm typ. (depends on the solder mask 
registration tolerance)
Stencil opening 0.250 mm
Stencil thickness 0.100 mm
Table 128. WLCSP - 72-ball, 4.4084 x 3.7594 mm, 0.4 mm pitch wafer level chip
scale package mechanical data (continued)
Symbol
millimeters inches
(1)
Min Typ Max Min Typ Max
BGA_WLCSP_FT_V1
Dsm
Dpad
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