Rec'd this e-mail, consider it deleted . . .
-----Original Message-----
From: Carano,Michael [mailto:[log in to unmask]]
Sent: Wednesday, May 10, 2000 5:06 PM
To: [log in to unmask]
Subject: Re: [TN] OSP
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Ioan,
The questions you raise are very good.
From experience in working with both assembly companies and bare board
fabricators:
1. Shelf life should be 8 months up to 12.
2. Handling is an issue with any surface finish.
3. The OSP brand may not be compatible with all no clean fluxes and
pastes. One should verify the flux/paste in the context of the OSP. (check
things like hole fill, pad wet out on topside, solder paste spread, etc.)
4. A good OSP should stand up to at least three thermal excursions. (
double sided surface mount, plus wave.) and one selective solder. One should
look closely at the reflow profile and try to minimize pre heat temp/time
for side one. Another good practice is to minimize hold times between first
and second reflow,
5. Nitrogen atmosphere in soldering will help minimize degradation.
Basically, a tremendous number of complex pwb's are assembled every day. If
you have never used OSP before, it is different than solder.
Best regards,
Michael Carano
-----Original Message-----
From: Tempea, Ioan [SMTP:[log in to unmask]]
Sent: Wednesday, May 10, 2000 3:48 PM
To: [log in to unmask]
Subject: [TN] OSP
Hi everybody,
just ran into my first OSP coated board.
I've checked the archives, but the oppinions seem to be divided. So
I
decided to raise the questions again:
how's the shelf life for OSP boards?
will the solderability degrade more than for HASL due to bare handed
manipulation?
how touchy OSP is with no-clean, so lighter fluxes?
it is a double sided assembly, with SMT and TH components on each
side. Will
the boards be good for two reflows and two selective soldering
operations?
Thanks for any help,
Ioan
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