Bogert
What is the final finish of this board


Mickey

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of - bogert
Sent: Thursday, November 27, 2008 5:05 PM
To: [log in to unmask]
Subject: [TN] Tenting of vias and spare PTH

We have an existing design PWA with socket mounted parts.  The design
has vias under the sockets as well as PTH under the sockets that were
intended for use as spares to facilitate future design changes.  The
sockets are of the open construction frame type (an H configuration), or
otherwise are body-less sockets.  We are considering removing all
sockets and direct soldering the components into the existing PTH using
ORL0 type flux.

We are concerned about flux residue and other forms of contamination
such as from the PWB manufacturing process and the PWA assembly process
getting into the open via and spare PTH and not being removed by the
in-line cleaning system.

We are considering having the vias and spare PTH tented in some fashion.
We need to retain use of the tented spare PTH for future use if needed.
What method do folks recommend to tent vias on equipment that was
already designed with un-tented vias and spare PTH?

On a go forward basis, we are considering mandating that if vias are
used under components, they must be tented and we will not allow spare
PTH under any component.  Allowing spare PTH under open frome or
bodyless sockets was a dumb idea.

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