Re: [sdiy] Trace width and via diameter/hole size

[Roman]

normally vias are not filled, meaning you can see thru a hole.
I never heard about filling vias by PCB fab, but it may have some advantage. Hole plating can be broken at the edge (where pad surface meets tube surface in the hole). When it's flooded with solder, and that's what I assume is your filling, then you have a chance to still have working board vith vias broken.

There are also microvias, so tiny there's no hole anymore, it's all filled with copper. But that's high tech and probably damn expensive.

Well, it may be that the PCB fab uses solder immersion without HAL for solder plating traces and vias get filled just because they're small.

Roman

---- Wiadomość Oryginalna ----
Od: Bert Schiettecatte <bert at percussa.com>
Do: 'Paul Perry' <pfperry at melbpc.org.au>, synth-diy at dropmix.xs4all.nl
Data: Thu, 8 Sep 2005 15:14:21 +0200
Temat: RE: [sdiy] Trace width and via diameter/hole size

> Hi Paul,
> 
> > It's usually pretty standard (in my experience) to have 
> > plated through holes, because otherwise you might find 
> > situations where you need to solder on  BOTH sides at the one 
> > hole, and that can be damned awkward.
> > 
> > but yes, the guys who do my boards could give me a double 
> > sided board without the plated holes, if i asked.
> 
> Yep it's standard to have plated through holes. But the holes are
> Normally not FILLED ?
> 
> bert
> 
>