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Reply To: | TechNet E-Mail Forum. |
Date: | Fri, 12 Feb 1999 08:21:15 -0500 |
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Hello Don, haven't talked to you for awhile, though we sprang from the
same mother company a few years back, how ya been?
There are some major "issues" we have found in using OSP's as opposed
to HASL, we are currently using both.
My first question would be, "what is driving you towards OSP"? Are you
moving toward fine pitch under .020"?? If so, there are other new
processes that are improvements over OSP in function, though they may
cost a little more. (See the recent discussions on white tin
immersion, gold flash, etc.)
Here are some negatives we deal with on OSP coated boards.
1) Our convection reflow ovens have flux-filtration style heat
exchangers.When the OSP burns off, it collects in the flux-filtration
traps, and requires literally four times the maintenance to keep the
filters clean vs. just our std no-clean flux, very time consuming and
messy.
2) Some of our placers have vision problems reading the fiducials thru
the OSP coating.
3) If you are running dbl-sided reflow, the first pass will burn off
most of the OSP on the 2nd side, so you need to process the 2nd side
fairly quickly or you will begin oxidation.
Just a couple of quick thoughts. Regards.
Jeff Hempton
United Technologies Electronic Controls
______________________________ Forward Header __________________________________
Subject: [TN] PPM data for HASL versus Organic Coated boards
Author: Don E Steffen <[log in to unmask]> at Internet
Date: 2/12/99 7:02 AM
Technos
I am working on a major program and I am trying to decide whether to
process the line to use OSP organic coating versus HASL. Does anyone
out there have any PPM data that might support such a decision? What
are the risks in going with HASL versus going with OSP?
Thanks
Donn Steffen
VDO Control Systems
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