
NE866B1_Hardware_Design_Guide
1VV0301354 Rev. 6
Page
55
of
70
2018-02-28
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 are occurring at 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.
It is not ne
cessary to panel the application’s PCB, however in that case it is suggested to
use milled contours and predrilled board breakouts; scoring or v-cut solutions are not
recommended.
Stencil
Minimum stencil thickness recommended is 125um (5 mil)
Solder paste
We
recommend using only “no clean” solder paste in order to avoid the cleaning of
the modules after assembly.