Datasheet
DS10198 Rev 8 253/270
STM32L476xx Package information
263
Figure 70. WLCSP81- 81-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.
The printed markings may differ depending on the supply chain.
Other optional marking or inset/upset marks, which identify the parts throughout supply
chain operations, are not indicated below.
F - 0.6042 - - 0.0238 -
G - 0.2797 - - 0.0110 -
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 127. WLCSP81 recommended PCB design rules (0.4 mm pitch)
Dimension Recommended values
Pitch 0.4 mm
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
Table 126. WLCSP- 81-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
A05Z_FP_V1
Dpad
Dsm
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