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June 2007

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Subject:
From:
Paymon Sani <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Paymon Sani <[log in to unmask]>
Date:
Wed, 13 Jun 2007 11:07:37 -0400
Content-Type:
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text/plain (363 lines)
You just answered my response to Vlad, thank you.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: June 13, 2007 10:45 AM
To: [log in to unmask]
Subject: Re: [TN] Nickel barrier and RF applications

It can change the contour or extend the coverage of the solder
connections enough to reduce the signal loss due to the Hall effect, and
it can also reduce the flux residues after the board is cleaned a second
time. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev
Sent: Wednesday, June 13, 2007 9:39 AM
To: [log in to unmask]
Subject: Re: [TN] Nickel barrier and RF applications

I think, there is one question to ask. If ENIG (or rather the presence
of Ni) is the source of the problem, then why does 2nd reflow improves
the yield?


Regards,

Vladimir
AMD

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Wednesday, June 13, 2007 10:34 AM
To: [log in to unmask]
Subject: Re: [TN] Nickel barrier and RF applications

Thank you Steve,

This sheds a lot of light on the current RF product failures at my
company. As a matter of fact, my PCB supplier is applying ENIG on all
copper surfaces before the mask application!
Paul, thank you for initiating this trend.

Cheers,
Paymon

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: June 13, 2007 10:23 AM
To: [log in to unmask]
Subject: Re: [TN] Nickel barrier and RF applications

I just realized that the URL may have wrapped. Try this one:

http://tinyurl.com/2vjenp

This might be the same one that Inge was talking about....

Steve Gregory

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, June 13, 2007 9:00 AM
To: [log in to unmask]
Subject: Re: [TN] Nickel barrier and RF applications

Here's an article:

http://www.taconic-add.com/pdf/technicalarticles--effectsofsurfacefinish
.pdf

Steve Gregory

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Wednesday, June 13, 2007 8:57 AM
To: [log in to unmask]
Subject: [TN] Nickel barrier and RF applications

Hello John, is it documented anywhere?

Paymon

-----Original Message-----
From: John Burke [mailto:[log in to unmask]]
Sent: June 13, 2007 9:53 AM
To: 'TechNet E-Mail Forum'; Paymon Sani
Subject: RE: [TN] Plating

The nickel in enig  is not good for frequencies above 3 - 4 GHz


 
 
John Burke
 
(408) 515 4992
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Wednesday, June 13, 2007 6:47 AM
To: [log in to unmask]
Subject: Re: [TN] Plating

Hello Inge,

This is very interesting! I did not make the connection between the
Nickel on the PCBs and the RF application. Are there any papers that
explain the sensitivity of RF applications to the Nickel barrier in ENIG
PCBs?
We are having trouble with a 5.8 GHz RF product right now. The assembly
meets the IPC-610D requirement. However, 25% of the products fail
testing. We reflow the failed assemblies for the 2nd time and 50% of
them pass testing! We do not know the RC of the failures. I was
suspecting the flux to be the root cause but could it be the Nickel
barrier?

Cheers,
Paymon



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
Sent: June 13, 2007 2:33 AM
To: [log in to unmask]
Subject: Re: [TN] Plating

Paul,

Lockheed Martin use a lot of platings. I'm not sure, but I have seen
Boron as a barrier somewhere, just can't find it right now. Anyway,
Lockheed as well as NASA use many special platings. Non-magnetic, guess
you have a RF application that need low-loss lines.

http://supplier.external.lmco.com/supplier/po_information/specpro2.htm


I was myself looking for a non-magnetic finish once, and if I remember
right, there is a difference between EN and EN. The acidous electroless
nickel is not ferromagnetic, while alcaline electroless nickel is
somewhat ferromagnetic.

Borohydride electroless Nickel-Boron is probably non-magnetic too.

However, you should contact your plating chemist to verify, it was many
years since I mixed with this. (In earlier days, we had our own
chemists, many of them had piles of knowhow, but then came the
economist's era, and the chemists were kicked out)

Inge

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stolar, Paul W
Sent: den 12 juni 2007 23:38
To: [log in to unmask]
Subject: [TN] Plating

We are using nickel as a barrier metal on a PC board for the pads. 

Are there any other barrier metals we can use which are non-magnetic.

Bare copper is not an option.

Paul Stolar
Materials/Reliability Engineer
Manufacturing Reliability Lead Engineer
Baker Atlas
713-625-5376
713-625-4949 (fax)

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