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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