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May 2008

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Subject:
From:
"Wenger, George M." <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Wenger, George M.
Date:
Tue, 27 May 2008 11:34:57 -0400
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I'm having a hard time believing that the size of the ho
Robert,



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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