Datasheet

SMX1J Recommendation on PCB assembly
Doc ID 16180 Rev 3 7/11
4 Recommendation on PCB assembly
4.1 Stencil opening design
1. General recommendation on stencil opening design
a) Stencil opening dimensions: L (Length), W (Width), T (Thickness).
Figure 14. Stencil opening dimensions
b) General design rule
Stencil thickness (T) = 75 ~ 125 µm
2. Reference design
a) Stencil opening thickness: 100 µm
b) Stencil opening for leads: Opening to footprint ratio - between 65% and 70%.
Figure 15. Recommended stencil windows position
L
T
W
Aspect Ratio
W
T
-----
1.5≥=
Aspect Area
LW×
2T L W+()
----------------------------
0.66≥=
550 µm
830µm
560 µm
360 µm
135µm
95 µm
Footprint
Stencil window
Footprint
T=100 µm
0.83
0.55
1.72
0.62
135µm
95 µm