ESDAXLC6-1BT2 Datasheet, PDF (6/10 Pages) STMicroelectronics – Single-line bidirectional ESD protection for high speed interface

Recommendation on PCB assembly
3
Recommendation on PCB assembly
ESDAXLC6-1BT2
3.1
Stencil opening design
1. General recommendation on stencil opening design
a) Stencil opening dimensions: L (Length), W (Width), T (Thickness).
Figure 12. Stencil opening dimensions
L
TW
b) General design rule
Stencil thickness (T) = 75 ~ 125 µm
Aspect Ratio
=
W-----
T
 1,5
Aspect Area = _{2----T---L-}---L-^---+-W----W-------_  0,66
2. Reference design
a) Stencil opening thickness: 100 µm
b) Stencil opening for central exposed pad: Opening to footprint ratio is 50%.
c) Stencil opening for leads: Opening to footprint ratio is 90%.
Figure 13. Recommended stencil window position
Lead footprint on PCB
Package footprint
0.055 mm
Lead footprint on PCB
Stencil window
position
0.39 mm
Stencil window
position
0.45 mm
0.05 mm
0.05 mm
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DocID023680 Rev 2