
xE922-3GR Hardware User Guide
1VV0301272
Rev.0.8 2017-01-05
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Page 99 of 112
17.6.
Recommendations for PCB Pad Dimensions (mm)
It is not recommended to place via or micro-via, which are not covered by solder resist in an
area of 0.3 mm around the pads unless it carries the same signal of the pad itself (see following
figure).
Holes in pad are allowed only for blind holes and not for through holes.
Recommendations for PCB Pad Surfaces:
Finish
Layer thickness (um)
Properties
Electro-less Ni / Immersion Au 3
–
7 / 0.05
–
0.15
good solder ability protection,
high shear force values
The PCB must be able to resist the higher temperatures which occur during the lead-free
process. This issue should be discussed with the PCB-supplier. Generally, the wettability of tin-
lead solder paste on the described surface plating is better compared to lead-free solder paste.