We had this experience where the PCB supplier made a mistake and applied
ENIG as the surface finish in place of HASL. Then they ran the PCBs with
ENIG finish through their normal HASL process before shipping it to us.
Unfortunately, we had a very bad solder wetting to the pad surfaces; the
investigation suggested that in some areas the IMC was as thick as the
solder thickness on the nickel layer!
There is no way for this to be a standard process with blocks showing
HASL after gold plating. The alternative that the PCB has selective hard
gold plating at the fingers prior to the HASL process makes sense.
Sincerely,
Paymon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jason Zhao
Sent: October 14, 2008 3:13 PM
To: [log in to unmask]
Subject: Re: [TN] Process question-Pls reply urgently....!
There is a slight chance that the board shop made a mistake by using
ENIG
instead of HASL as final finish. Instead of start everything over again,
They decided to rework the parts by putting HASL over ENIG. Talk to the
supplier to find out for sure.
Regards,
Jason Zhao
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of anand paliwal
Sent: Tuesday, October 14, 2008 1:52 PM
To: [log in to unmask]
Subject: Re: [TN] Process question-Pls reply urgently....!
I am confused.
i have some chart which shows block of gold plating then HASL/HAL.
i am trying to understand if it is by mistake showing HASL after Gold
Plating ?
or some Fabricator actually using HASL/HAL Process after Gold plating
Process ? if yes why did they required to do that ?
Thanks
Regards,
Anand
On Tue, Oct 14, 2008 at 12:28 PM, Lee Whiteman
<[log in to unmask]>wrote:
> Roger,
>
> I never heard of HASL over gold. I am assuming that the gold is
> deposited (?) over the copper pads, then HASL is performed.
>
> What are the advantages of this finish over ENIG and straight HASL?
>
> Why would a board be finished like that? Just curious.
>
> Lee Whiteman, PMP
> Senior Member Engineering Staff
> L-3 Communications East
> Telephone: (856) 338-3508
> FAX: (856) 338-2906
> E-Mail: [log in to unmask]
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Roger Stoops
> Sent: Tuesday, October 14, 2008 2:22 PM
> To: [log in to unmask]
> Subject: Re: [TN] Process question-Pls reply urgently....!
>
> Gold and silver are deposited by chemical methods. Solder, both
> lead-free and lead/tin, are deposited by HASL. HASL solder can be
> applied after gold finish, as in the case of gold-plated edge fingers.
>
> HASL = Hot Air Solder Leveling
>
> Roger
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of anand paliwal
> Sent: Tuesday, October 14, 2008 2:19 PM
> To: [log in to unmask]
> Subject: Re: [TN] Process question-Pls reply urgently....!
>
> could that melting metal would be the gold, silver, ?
>
> thanks for the reply
>
> regards,
> Anand
> On Tue, Oct 14, 2008 at 12:08 PM, <[log in to unmask]> wrote:
>
> >
> > Anand
> > HASL is not applied over other finishes, to the best of my
knowledge.
>
> > HASL is a process for putting a melting metal onto a copper
substrate.
> >
> > Doug Pauls
> > Rockwell Collins
> >
> >
> > *anand paliwal <[log in to unmask]>* Sent by: TechNet
> > <[log in to unmask]>
> >
> > 10/14/2008 12:40 PM Please respond to
> > TechNet E-Mail Forum <[log in to unmask]>; Please respond to anand
> > paliwal <[log in to unmask]>
> >
> > To
> > [log in to unmask] cc
> > Subject
> > [TN] Process question-Pls reply urgently....!
> >
> >
> >
> >
> > Hi All,
> >
> > I have One question Does the HASL Applied after gold plating ?
> >
> > is HASL can be used for Different Plating finish ?
> >
> > Thanks
> > --
> > With Best Regards,
> > Anand
> >
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> --
> With Best Regards,
> Anand Paliwal
>
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--
With Best Regards,
Anand Paliwal
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