Electronics Forum | Wed Mar 21 14:14:12 EDT 2007 | mmjm_1099
Well we just starting using the OSP finish ourselves. We are using the same application so far and have found no major issues. We do SMT to reflow......
Electronics Forum | Mon Sep 10 23:13:08 EDT 2007 | weehn
hi, i'm from the semicon (BGA assembly). Could you advice what is the best method / procedure to remove OSP coatings from pads of the BGA substrates. thanks Wee
Electronics Forum | Fri May 14 09:00:35 EDT 2010 | rafacadiz
I attached a RX picture. A lot of voids and micro balls arround the flux residue. What do you think, relow temperature reflow or OSP poor weeting.? I appreciate your comments. Thanks,
Electronics Forum | Thu Sep 27 16:40:12 EDT 2012 | davef
Ideally, shelf life should be twelve months from application, but not all OSP's are the same so check manufacturer's instructions
Electronics Forum | Fri Apr 18 18:06:47 EDT 2014 | davef
Methods that can reduce the wettability of OSP: * Previous heat cycles * Previous cleaning cycles * IPC-1601 "Printed Board Handling and Storage Guidelines" says do not bake prior to soldering * Using improper handling methods BR ... davef
Electronics Forum | Fri Feb 12 15:37:51 EST 2016 | cinthiaap
IPC-4555 has not completed yet. According to IPC org, it will be complete in mid-2017. Is there another guideline about OSP finish surface? In fact, we assembled 50 pieces and no problem. But in solderability test we have problems in some features. D
Electronics Forum | Wed Feb 14 15:54:18 EST 2018 | cbart
do you see signs of contamination or oxidation? if not why not just send them to the board house and have another OSP coating layer applied?
Electronics Forum | Wed Oct 13 15:09:55 EDT 2021 | dingerusaf
What is the proper storage and shelf life after washing a PCB with an OSP finish? We sometimes have to pull the boards off the line and wash the solder paste off the boards.
Electronics Forum | Thu Oct 14 11:36:18 EDT 2021 | stephendo
The best shelf life for OSP is run both sides the same day they are opened for the first time. They are good for JIT but I didn't know that they were still good after washing.
Electronics Forum | Thu Oct 14 16:38:29 EDT 2021 | SMTA-64387687
OSP is there to keep the copper from oxidizing. Once you wash the board, the copper is exposed. So, you have to either use it right away, or store it in a non-oxygen environment (vacuum/nitrogen).
