I think the Hardness of the gold specified would help in the case of
contact fingers.
With contact fingers we always specified Knoop Hardness I'd have to dig
up an old fab dwg have't used fingers in awhile.
However on just a switch contact we did not specify hardness just
thickness.
Which immersion thicknesses were enough I believe to handle switch
contacts
For huge number of cycles?
Bob
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Eric
Bonatti
Sent: Friday, June 08, 2007 3:52 PM
To: [log in to unmask]
Subject: Re: [DC] Gold plating question / IPC spec?
Thanks Jack,
I'll let you know what we find.
In the mean time if anyone here has additional info, it would be
appreciated.
Eric Bonatti, C.I.D.
EDA Group Leader
Phone: +1 905 812 6200 xt.3412
Fax: +1 905 812 6301
E-mail: [log in to unmask]
Psion Teklogix Inc.
2100 Meadowvale Boulevard,
Mississauga, ON, L5N 7J9, Canada
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Jack
Olson
Sent: Fri. 08 June 2007 14:27
To: [log in to unmask]
Subject: Re: [DC] Gold plating question / IPC spec?
There's a spec for Gold Plating, IPC-4552
I don't think it relates thickness to cycles.
and I'm pretty sure its because the studies
that were done "way back when" showed
that as long as the process was controlled,
you would get more cycles than you would
ever need.
I think it was Bell Labs that wanted to start
gold plating contacts on phones, and after
a million or so cycles they couldn't see
ANY damage, and abandoned the rest of
the test. (That's the way I heard it, anyway)
The point was, its NOT a situation like "if you
double the gold you get twice as many cycles".
It doesn't work that way....
Let us know if you hear differently, ok?
Jack
On 6/8/07, Eric Bonatti <[log in to unmask]> wrote:
>
> Hello group,
> I have a question regarding the gold plating specs for some contacts.
>
> Is there an IPC spec that relates the thickness of gold plating to the
> number of cycles that the plated contact can withstand? (i.e. for an
> edge connector card or the contacts on a rechargeable battery that is
> taken out and re-installed in the unit a few times daily)
>
> Thanks in advance for your time.
>
> Eric Bonatti, C.I.D.
> EDA Group Leader
> Phone: +1 905 812 6200 xt.3412
> Fax: +1 905 812 6301
> E-mail: [log in to unmask]
>
> Psion Teklogix Inc.
> 2100 Meadowvale Boulevard,
> Mississauga, ON, L5N 7J9, Canada
>
>
>
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