Sorry, Gerard. I totally disagree. I have bought too many boards from some of the best circuit board houses in the world with ENIG-associated problems. I know from personal, painful experience that ENIG can cause problems no matter how well controlled the vendor's process is.
Anyone who would advise that if IPC4552 is followed they will have no problems, well that is just plain irresponsible.
And we are all learning that black pad is not the only problem associated with ENIG.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerard O'Brien
Sent: Friday, May 12, 2006 7:31 AM
To: [log in to unmask]
Subject: Re: [TN] Question about ENIG in SnPb process . . . .
Camille - first of all, refer to IPC4552 which is the ENIG spec, purchase boards from suppliers following this spec and you shall have no issues.
Please be aware that reflow temperatures need to be increased slightly, 220C minimum to ensure a good solder joint formation, due to the relatively slower wetting of nickel.
Werner - please, enough with the black pad already, the world is using ENIG somewhere between 7 to 10% as the surface of choice. The old adage of you get what you pay for applies as does buyer beware - if you buy from a schlock house you will have not only solderability issues but other less obvious defects as well.
Regards
Gerard O'Brien
Photocircuits Corporation
Co-chair 4-14 plating committee.
-----Original Message-----
From: Camille Good [mailto:[log in to unmask]]
Sent: Thursday, May 11, 2006 7:28 PM
To: [log in to unmask]
Subject: [TN] Question about ENIG in SnPb process . . . .
Has anyone run into problems using PCBs with ENIG finish in regular SnPb IR reflow or wave solder processes?
I just talked to someone who said that there were industry advisories out from a couple of companies (maybe Intel & Radisys??) advising against that mixture of solder & surface finish, but I have not heard anything about that on either the TechNet or Lead-Free discussion groups, and a Google search for "SnPb solder ENIG finish" didn't turn up any immediate warnings either.
Many thanks in advance for any information,
-Camille Good
Portland, Oreong
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