James Paul,
Removing or reducing unused internal
pads
should have no effect on your board
If this is a soldered pad, the fault
most
likely lies in the soldering of the pad/hole.
Without the additional
internal copper to
dissipate the heat, it may have broken down.
Many
fabricators recommend or will remove unused
pads on internal layers for you.
A 60 pad
should be sufficient for a 32 hole though.
A 64 is more ideal,
but it all depends on
application. If internal pads are to be removed,
it
is recommended that the external pads are
a bit larger to dissipate
heat.
Chris Robertson
[log in to unmask]
Senior Designer
Lockheed-Martin Services Inc.
4912
Research Dr.
Huntsville, AL 35805
(256) 722-2626
http://www.lmsg.lmco.com
> Hi
> I have used 60 mil pad
dia with 32 mil hole design for
> past 14 years. so far i did not come
accross any
> failure of the solder joint due to design error.
>
however i have found failures when i suppressed the
> pads in the power
plane where it was unconected, on
> high frequency ECL design boards.
hence i feel 60 mil
> pad dia with 32 mil pad and unsuppressed pads in
the
> planes will give best reliability
>
> regards james m
paul
>
> --- Jack Olson <[log in to unmask]>
wrote:
> > I never thought THAT coin would have two sides...
>
> HA!
> > It isn't often that a response takes me totally
>
> by surprise.
> > Thanks, that was a great one!
>
>
> > sushi anyone?
> > Jack
> >
>
>
> > --- [log in to unmask] wrote:
> > >
Jack-
> > >
> > > Sometimes a guy just wants a fish.
Sometimes a guy
> > > is just visiting the
> > > coast
and wants to try fish. You could give him
> > one
> > > or
you could teach him
> > > to fish. So he's gotta buy a hook and some
line,
> > > probably a rod and reel,
> > > maybe some
bait. Then he has to learn how to bait
> > > the hook. He has
to
> > > learn where and when they bite. Pretty soon he
> >
finds
> > > he has to buy a boat
> > > to do any good.
So he decides he hates seafood
> > > anyway and goes back to
his
> > > cattle ranch. But if you'd given him a fish, maybe
>
> > he'd-a liked it enough
> > > to learn how to fish
himself.
> >
> >
> >
__________________________________________________
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