Gerard,
I just try to point out the danger of using "off the shelf" data to justify
reliability without testing.... (a rather few is doing that and pay dearly
in the past). The top 5 sure have no problem (even better, the test coupon
normally provided by the bath selling vendor have better results than the
user... due to proper optimization. The user sometimes are limited due to
all kind of restriction, test, monitoring equipment, etc.etc).
By the way, I totally agree to use membrane material as lower design limit.
I always prefer to see the things degraded upon aging in front of my eyes,
rather than open up boxes with probe in hand (not to say it is a lot more
fun to use probe--- if nobody breath down to your neck for fast FA).
By the way, does IG got special quality test method by IPC? something like
steam test of solderability for flash gold or gel method for porosity test
of plated gold? Thanks in advance.
jk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Gerard O'Brien
Sent: Monday, April 25, 2005 9:43 AM
To: [log in to unmask]
Subject: Re: [TN] ENIG vs Hard Gold
Joyce - it was not "OUR" ENIG but rather submissions from the 5 big
suppliers of ENIG. They were tested at random with different switch pad
designs. If you are using a low "Q" ( I take it this means quality), you
will have much bigger issues than will the deposit make it to 1.5 million
cycles.
And to re-iterate - we stopped testing because the membrane switch material
was beginning to break down, there was no evidence of any damage to the ENIG
surface. We tested various deposit thickness and saw the same results - the
membrane material started to break down and the ENIG deposit remained as
plated.
Gerard
-----Original Message-----
From: Joyce Koo [mailto:[log in to unmask]]
Sent: Monday, April 25, 2005 8:04 AM
To: [log in to unmask]
Subject: Re: [TN] ENIG vs Hard Gold
Question: there are ENIG and "ENIG". you could have both 2 microinch, high
Q or low Q make a lot of difference. Canyou claim other people's 1.5
million type of product is equivalent to yours? how could you varify yours
is the "1.5 million" that "equivalent or better"?
jk
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of David Douthit
Sent: Monday, April 25, 2005 8:54 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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