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Subject:
Re: best plated surface finish
From:
Dwight Mattix <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dwight Mattix <[log in to unmask]>
Date:
Tue, 22 Nov 2005 10:09:09 -0800
Content-Type:
text/plain
Parts/Attachments:
text/plain (332 lines) 
We do quite a bit of work w/ flash gold on chip tester boards (flash in SMT
areas and full hard gold in probe contact areas).  If works fine for those
purposes.  We solder assemble w/ almost immediately upon receipt to keep
the silicon development moving.

If on the other hand your pwbs need to provide long shelf life or if your
application has high rel SIR/electromigration concerns
then do your reliability homework.

In our experience electrolytic gold won't preserve solderability as well as
some other finishes (e.g. ENIG) if there's a long shelf life and it
typically doesn't provide as clean (SEC test) a pwb as other finishes.  A
lot of that depends on your environment (storage, assembly, flux/cleaning
and application use).

It's all a matter of degrees. Flash Au suits our particular purpose fine
but remember to consider the particulars of you application and do your due
diligence.

cheers,
dw


At 09:36 AM 11/22/2005, Lee Parker wrote:
>Gerry
>
>Sounds like things are going well on your end. I am glad that someone has
>found a benefit from ROHS even if it approaches: "I have stopped beating
>my spouse".
>
>Actually the cost of Flash Gold from the Chinese Shops I am familiar with
>is at least on par with immersion silver and normally below ENIG.
>
>Best regards
>
>Lee
>
>J. L. Parker Ph.D.
>JLP Consultants LLC
>(804) 779 3389
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerald Gagnon
>Sent: Monday, November 21, 2005 6:28 PM
>To: [log in to unmask]
>Subject: Re: [TN] best plated surface finish
>
>Lee,
>
>Things are going great now that I'm back on the OEM side of things!
>
>I was just pulling your leg on the immersion silver. One of the hidden
>benefits of RoHS (albeit a very questionable one) is that it gives us all
>a
>chance to re-look at things. After a LOT of very grimey work, immersion
>silver and ENIG (ugggh) are looking pretty good. Haven't had a chance to
>evaluate Direct Immersion Gold or the newer lead-free HASL finishes yet.
>
>I'd love to use the electroplated nickel/gold flash process instead of
>ENIG
>for a lot of reasons but the alleged cost scare keeps coming up.....
>
>Next time you're up in the Boston area drop me a line.
>
>Best regards,
>
>Gerry
>
>
>
>
>From: Lee parker <[log in to unmask]>
>Reply-To: TechNet E-Mail Forum <[log in to unmask]>,              Lee parker
><[log in to unmask]>
>To: [log in to unmask]
>Subject: Re: [TN] best plated surface finish
>Date: Sun, 20 Nov 2005 14:45:30 -0500
>
>Jerry
>
>Hope all is well with you.
>
>I did not mention immersion silver since it has been discussed at length
>in
>this forum and most are ware that I am a huge advocate of immersion silver
>going bask to 1995 when I installed the first such line in North America
>at
>the AT&T plant in Richmond.
>
>I mentioned Flash Gold because it is a relatively new coating (in its
>present format) and is just beginning to catch the attention of the OEMs.
>
>Best regards
>
>Lee
>
>J. Lee Parker, Ph.D.
>JLP Consultants LLC
>804 779 3389
>----- Original Message -----
>    From: Gerald Gagnon<mailto:[log in to unmask]>
>    To: [log in to unmask]<mailto:[log in to unmask]>
>    Sent: Friday, November 18, 2005 6:28 PM
>    Subject: Re: [TN] best plated surface finish
>
>
>    Lee
>
>    Kudos from a long time lurker......
>
>    You're absolutely correct. Many many years of OEM experience with this
>    finish. Lots of fear over purported high cost of gold. There's a few
>    "application" secrets but it is the ultimate surface finish.
>
>    Now that the cat is out of the bag, how come you didn't mention
>immersion
>    silver?
>
>
>    Gerry Gagnon
>
>
>    From: Lee parker <[log in to unmask]<mailto:[log in to unmask]>>
>    Reply-To: TechNet E-Mail Forum
><[log in to unmask]<mailto:[log in to unmask]>>,
>               Lee parker
>    <[log in to unmask]<mailto:[log in to unmask]>>
>    To: [log in to unmask]<mailto:[log in to unmask]>
>    Subject: Re: [TN] best plated surface finish
>    Date: Wed, 16 Nov 2005 08:25:34 -0500
>
>    John
>
>    Another option is flash gold over nickel. Both are plated inline using
>an
>    electrolytic process(as opposed to ENIG). The gold thickness is roughly
>two
>    micro inches. The OEMs that I am familiar with that have used this
>finish
>    have reported very good results.
>
>    Most of the PCB suppliers providing this process are in China.
>
>    Best regards
>
>    Lee
>
>    J. Lee Parker, Ph.D.
>    JLP Consultants LLC
>    804 779 3389
>    ----- Original Message -----
>       From: Babcock
>John<mailto:[log in to unmask]<mailto:[log in to unmask]>>
>       To:
>[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:TechN
>[log in to unmask]>>
>       Sent: Tuesday, November 15, 2005 7:28 PM
>       Subject: [TN] best plated surface finish
>
>
>       If somebody wants an extra smooth plating finish using lead free
>plating
>       what material would they use...and what would be the finishing
>process?
>       I've heard HASL is sort of rough...and it really doesn't apply using
>       silver solder because of the melting temps.
>       Is ENIG (electroless nickel immersion gold) the way to go to get a
>       smooth finish?
>
>       thanks!
>
>       John Babcock
>       PCB Designer III
>       Isothermal Systems Research (ISR)
>       2218 N. Molter Rd
>       Liberty Lake, WA 99019
>
>[log in to unmask]<mailto:[log in to unmask]<mailto:jbabcock@spray
>cool.com<mailto:[log in to unmask]>>
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