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April 2005

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Subject:
Re: ENIG vs Hard Gold
From:
"Ingemar Hernefjord (KC/EMW)" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Ingemar Hernefjord (KC/EMW)
Date:
Wed, 27 Apr 2005 09:09:35 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (209 lines) 
Nice to see you on the net, P-E..
higher P%...what does that mean? From 6 to 7 ?  We had problems with high P% a couple of years ago (superBGA) and the brittle solder joints could only be cured by the plater's LOWERING the P%. We measured as much as 18% P, not as medium value, but locally within the ENIG. What is a "normal" P percentage today and what method is used to confirm that value?
Ingemar
Ericsson Microwave Systems

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]
Sent: den 27 april 2005 08:49
To: [log in to unmask]
Subject: Re: [TN] ENIG vs Hard Gold


Claus Würtz Nielsson from Nokia Mobile Phones published a paper at the IMAPS Nordic Conference last year entitled "The evolution of surface finishes in mobile phone applications". He reported that they have had corrosion problems with ENIG coated key pads. By using a new formulation of the ENIG process (higher P content and less porous Au coating) the corrosion stability was improved. Nevertheless, he concluded that "It becomes more and more clear that the thin ENIG in the future not will be able to address the need for higher wear resistance in the extreme part of the product segments as gaming devices and phones used by workmen or during sporting activities".

Per-Erik Tegehall
IVF

-----Ursprungligt meddelande-----
Från: Gerard O'Brien [mailto:[log in to unmask]]
Skickat: den 25 april 2005 15:33
Till: [log in to unmask]
Ämne: Re: [TN] ENIG vs Hard Gold


The POINT of this test was to examine if the use of ENIG as a switch
membrane interface was viable. The testing was performed to industry
protocol. There were no additional stress conditions  and multiple suppliers
were tested. Of course if you are going to use ENIG as a switch pad
interface metal in a corrosive environment or under water you may have some
slight issues - not least of which is the operator pushing the button.
Bottom line form the test was that for NORMAL use environments, such as cell
phones, radio's etc, the surface passed with flying colors - read the
document.




-----Original Message-----
From: David Douthit [mailto:[log in to unmask]]
Sent: Monday, April 25, 2005 7:54 AM
To: [log in to unmask]
Subject: Re: [TN] ENIG vs Hard Gold

Victor,

Not so great info!! This info can not be accurately correlated to "in
service " use because it does not take into account environmental
conditions. Temperature, humidity, contamination (airborne and other
forms) vibration and various combinations will drastically alter the
"life" of the key pads.

This test can give a false feeling of security!

David A. Douthit
Manager
LoCan LLC

Victor G. Hernandez wrote:

>Great info!   What is the 1.5 million cycles equate to in usage time.
>
>Victor,
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Gerard O'Brien
>Sent: Monday, April 25, 2005 7:14 AM
>To: [log in to unmask]
>Subject: Re: [TN] ENIG vs Hard Gold
>
>Alistair - as part of the 4552 specification testing, we ran ENIG at 2
>microinches for 1.5 million cycles for a keypad type application. We
>stopped
>because the membrane was breaking down  but not the ENIG surface. The
>data
>can be found in the tech paper that is in the appendix of IPC-4552
>
>Regards
>
>
>Gerard O'Brien
>Photocircuits Corporation
>Co-chairman 4-14
>
>-----Original Message-----
>From: Alistair Murray [mailto:[log in to unmask]]
>Sent: Monday, April 25, 2005 6:51 AM
>To: [log in to unmask]
>Subject: [TN] ENIG vs Hard Gold
>
>Hi to everyone,
>
>Could someone please let me know or indicate where I can obtain
>information on the relative performances of ENIG and Hard Gold in
>keyboard applications?
>
>
>
>Many thanks in anticipation.
>
>
>
>
>
>
>
>Alistair Murray
>
>Artetch Circuits Ltd
>
>UK
>
>
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