Sunday, September 8, 2013

Altium Script - Via Soldermask Barrel Relief

Updated Via Soldermask Barrel Relief (9-11-2013 11-24-56 AM)

PCB fabricators may request permission to apply Soldermask Barrel Reliefs to your tented vias when the via's hole sizes are 18mil or larger in size.  Consult with your fabricator as the requirements vary between suppliers.


For more about Soldermask Barrel Reliefs see : Via Barrel Reliefs - PCB Designer Blog 








Fabricators specify the barrel reliefs with respect to the via hole size. For example drill hole size + 5mil is typical.


The +5mil soldermask relief accounts for registration and process tolerances.

























To Force Complete Tenting

Tenting vias on one side can trap chemicals and fluxes in the via barrels which can corrode away the copper plating in the via barrels. This is a reliability issue. 

Reference:  Soldermask on via-holes in case of chemical Nickel-Gold surface finish


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