Datasheet
Package information STM32L431xx
182/200 DocID028800 Rev 1
Figure 55. WLCSP64 - 64-ball, 3.141 x 3.127 mm, 0.35 mm pitch wafer level chip scale
package recommended footprint
b
(3)
0.190 0.220 0.250 0.0075 0.0087 0.0098
D 3.106 3.141 3.176 0.1223 0.1237 0.1250
E 3.092 3.127 3.162 0.1217 0.1231 0.1245
e - 0.350 - - 0.0138 -
e1 - 2.450 - - 0.0965 -
e2 - 2.450 - - 0.0965 -
F - 0.3455 - - 0.0136 -
G - 0.3385 - - 0.0133 -
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 96. WLCSP64 recommended PCB design rules (0.35 mm pitch)
Dimension Recommended values
Pitch 0.35 mm
Dpad 0.210 mm
Dsm
0.275 mm typ. (depends on the soldermask
registration tolerance)
Stencil opening 0.235 mm
Stencil thickness 0.100 mm
Table 95. WLCSP64 - 64-ball, 3.141 x 3.127 mm, 0.35 mm pitch wafer level chip scale
package mechanical data (continued)
Symbol
millimeters inches
(1)
Min Typ Max Min Typ Max
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