At 08:34 AM 5/27/2008, Wenger, George M. wrote:
>I'm having a hard time believing that the size of the ho
>Robert,

concur.  should be the opposite.  Think about what "immersion" means 
and how an immersion process behaves as the base metal is covered up.

>I'm having a hard time believing that the size of the hole has anything
>to do with Immersion Silver.
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Croslin, Robert
>Sent: Tuesday, May 27, 2008 10:57 AM
>To: [log in to unmask]
>Subject: [TN] PTH's With Immersion Silver
>
>We've been using immersion silver on our boards for quite a while with
>great success, but in a recent run of a new product, we had the boards
>come in with the PTH's used to mount RCA and audio connectors smaller
>that usual.  The parts came in on the large end so it became very
>difficult for the operator to insert them into the board.  Both holes
>and parts were in tolerance and the holes were specified at the
>recommended diameters.  Our CM has a woman who spent 20 years working in
>pcb fab houses and she tells me that it's not at all unusual to have IS
>boards with reduced ID's on the holes as opposed to HASL.  Has anyone
>else experienced this?  If this is the case, we'll have to adjust for
>this in the future, but it would be useful to know if this was an
>anomaly or a normal condition?
>
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