All,
I have a PCB of thickness 60mils(0.060"/1.53mm) and has a smallest through hole via is 4 mil(0.004"/0.1mm). These are NOT Via in pad.
The aspect ratio here is 15.
Fab vendors asking for via fill here. Does these 4 mil via need to be filled? I have boards done without fill for a 8mils drill on a 120mil thick board (Aspect ratio is 15 here).
Appreciate to help to understand what parameter or factors determine the filling here.
Thanks,
Nagaraj.