Haha, I'll take the 15inches of gold off at incoming inspection and put it towards my retirement! Apparently it didn’t like my micro symbol, how about 15 micro inches
-----Original Message-----
From: TechNet <[log in to unmask]> On Behalf Of Douglas Pauls
Sent: Friday, January 3, 2020 2:48 PM
To: [log in to unmask]
Subject: Re: [TN] [External] [TN] immersion gold thickness
Ya gotta wonder how long it takes to plate up 15 INCHES of gold......
*Douglas Pauls *| Principal Materials and Process Engr | Advanced Operations Engineering
*COLLINS AEROSPACE*
400 Collins Road NE, MS 108-101, Cedar Rapids, IA 52498 USA
*Tel:* +1 319 295 2109 | *Mobile: *+1 319 431 3773
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On Fri, Jan 3, 2020 at 3:45 PM David Hillman < [log in to unmask]> wrote:
> Hi Murray - if you can get a true ENIG plating chemistry to put 15
> inches of gold thickness on a board, you would never want to use the
> board as the gold plating would have severe structure and/or
> solderability issues. The IPC-4552 specification contains the industry
> consensus gold plating thickness range that applies to producing an
> acceptable and reliable ENIG plating layer. Any gold plating thickness
> outside of that range would be questionable at best for quality and
> reliability unless you are working closely with a plating chemistry
> supplier who is doing a custom plating bath composition. One of the
> early issues of ENIG plating was the industry asking the plating
> chemistry suppliers to provide an immersion gold plating thickness
> that exceeded the acceptable physics of the plating chemistry (basically this is how we discovered "black pad"!).
>
> Dave Hillman
> Collins Aerospace
> [log in to unmask]
>
> On Fri, Jan 3, 2020 at 3:30 PM Campbell, Murray
> <[log in to unmask]>
> wrote:
>
> > Happy New Year All,
> >
> > Is there any good reason to call out a maximum gold thickness /
> > nickel thickness on fab notes or is it sufficient to rely on simply
> > stating that the fabricator shall follow ipc-4552 minimum thickness?
> > I have seen some companies state that a maximum thickness upwards of
> > 15 µin to be acceptable. Is there any value in stating an upper range?
> > I know it states in 4552 that an upper range had been debated and
> > not necessary but I still see an upper added to fab notes.
> >
> > Regards,
> >
> > Murray Campbell
> > PCB Design Specialist
> > [log in to unmask]<mailto:[log in to unmask]>
> > [cid:[log in to unmask]]
> >
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