Datasheet

ManualsBrandsST ManualsEmbedded Processors & ControllersMicrocontroller 32bit 512KB LQFP
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DocID027107 Rev 6 193/202
STM32F446xC/E Package information
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Figure 83. WLCSP81- 81-pin, 4.4084 x 3.7594 mm, 0.4 mm pitch wafer level chip scale
package recommended footprint
 
F - 0.2465 - - 0.0097 -
G - 0.3075 - - 0.0121 -
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 116. 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 115. WLCSP81- 81-pin, 3.693 x 3.815 mm, 0.4 mm pitch wafer level chip scale 
package mechanical data (continued)
Symbol
millimeters inches
(1)
Min Typ Max Min Typ Max
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