Back in my old Nortel days w.r.t press-fit connectors, there was a big
question mark over their use with ENIG due to possible exposure of
subcutaneous nickel and possible corrosion after assembly - particularly on
backplanes/midplanes. But, they were still used on PIUs with ENIG finish -
so... from memory it came down to the style of compliant pin collapse
employed and as you say hole size (but this is a few years ago and the
memory dims...).
I expect there will be many expert opinions in the Technet forum archives
w.r.t. press-fit and ENIG issue specifically.
Regards,
Phil.
-----Original Message-----
From: Smith, Rick [mailto:[log in to unmask]]
Sent: 03 August 2005 14:55
To: [log in to unmask]
Subject: Re: [LF] Press-fit terminations
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I'm curious, who told you ENIG is not good for press-fit?
We have not experienced any problems with ENIG/ Press-fit (after
adjusting drill size to get finished hole size to spec).
Please elaborate,
thanks
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Dennis Bang
Sent: Tuesday, August 02, 2005 9:35 PM
To: [log in to unmask]
Subject: Re: [LF] Press-fit terminations
Further to this, I found a panel discussion which lists Immersion Ag and
OSP
has issues with the Press-fit compatibility, and there was no mention of
ENIG compatibility with press fit. Is this because it's a given that you
just don't use ENIG for press fit? What was the reason why Imm-Ag was
found
incompatible with Press-fit while other sources have stated otherwise?
http://www.smta.org/files/SMTAI04_surface_finishes_panel.pdf#search='sur
face
%20finishes%20%20issues%20past%20present'
Can anyone shed some light on this??
> -----Original Message-----
> From: Dennis Bang
> Sent: Monday, 1 August 2005 6:18 PM
> To: Lead Free Forum (E-mail)
> Subject: Press-fit terminations
>
> Hi fellow technetters
>
>
> From previous discussions on this topic, OSP and Im-Sn are recommended
as
> the PCB finish.
>
http://listserv.ipc.org/scripts/wa.exe?A2=ind0402&L=leadfree&P=R328&I=-3
>
http://listserv.ipc.org/scripts/wa.exe?A2=ind0401&L=leadfree&P=R5429&I=-
3
>
> This info was in 2004. Have there been any updates since for the
preferred
> PCB finish for Pressfit applications? Has anyone used or trialed Lead
Free
> HASL for press-fit connectors? Any issues?
>
>
> Regards
> Dennis.
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