What do we want ? we want the copper of the vias being covered with the
solder mask but the via holes open.
I add a solder mask expansion design rule that simply says the rules
attribut is -Minimum_Annular_Ring (what i use for the vias 10mil). This
means that the copper is covered but the hole is
The right theme at the right time!
At the start of the week i was confronted with the same kind of problem.
The manufacturer of our multilayer-PCB send us the following statement:
"There are no clearances for some of the .0118 via holes on top and bottom
solder mask layers.
Plugging/Tenting bot
so what was the pad size?
32 ? (22+5+5)
Dennis Saputelli
ICT Mail wrote:
> Ivan, we have found that the best solution is PARTIAL TENTING.
> ie You need to cover the annular ring with mask but leave the hole free.
> This allows the via to be flushed of any residual etching chemicals and will
>
Hello Ivan,
I find the technique that Leon described, of partial tenting, or via
encroachment works well. Applying a negative solder mask clearance to the
vias of a value that will cover the land of the via, but not the hole. If
you are worried about solder travelling up the vias and forming sold
"Tenting" is covering the pad and hole with solder mask. "Plugging" the
via is a much more expensive operation, and is not generally done unless
one is worried about wicking solder away from joints such as BGA balls, or
the via is plugged and surface plated to accommodate a spring loaded
cont
Ivan, we have found that the best solution is PARTIAL TENTING.
ie You need to cover the annular ring with mask but leave the hole free.
This allows the via to be flushed of any residual etching chemicals and will
still fill if wave soldered.
Depending on your fabricator and process allowance, typi
Hello, all:
I am wondering what to do about vias. I have a design for an 8-layer 0.090
in. PCB with about 700-800 vias 32mil pad, 18mil hole (no BGAs). Since the
vias can be very close (6 mil) to other vias and pads, I want to cover the
vias with either soldermask or tent them. What is the dif
Take a look at Protel knowledge base item 2215 (
http://www.protel.com/kb/default.asp ).
I was able to open the Altera Gerbers in CAMtastic, save them to new files,
edit the comment fields out (G04 coded lines), and then import them into
Protel 99SE (with SP6).
If you really need the Altera f
Bob:
I hear ya loud and clear. I am an old Tango Dos user and I have also used
just about every other CAD program under the sun over the last 15 years, but
really when Protel is setup the way you want and you stick with the same
procedures then it runs very smooth. I have just completed 2 more d
Brad:
Yes, I used both multilayer lines and arcs but I changed them all to my
mechanical layer 4 and then no more problems so I am not sure exactly if it
was just the arcs or both the arcs and lines.
Regards,
Gary Allbee
Alta Industrial Automation Ltd
www.aialtd.com
> Gary,
> I don't use the auto
Gary,
I don't use the autorouter at all but I have to ask about your
multilayer lines. Were any segments of these lines actually arcs? Like at
the ends of your slot? The Protel autorouter does not like arcs, I don't
know the exact connotation of that statement but on numerous occasions the
Gary,
Very interesting, I had a similar situation, (before I found this forum)
where the autorouter
would just not run, still don't know why, it was very early in the design
stage and I was just testing
out the system so not being able to resolve it I started from scratch (it
was a simple board).
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