James, Indium Corporation does not recommend using a high Sn alloy, such as
Sn96, with gold plating due to the brittle Au/Sn intermetallics that could
form and cause reliability issues. However it depends on the thickness of
the gold layer. Typically if you have 10-15 micro-inches of gold the gold
will act as a sacrificial layer. This gold layer will protect the nickel
from oxidation and will dissolve into the solder joint and you will actually
be soldering to the nickel or underlying metallization. If you have 40-50
micro-inches, or more, gold you are actually soldering directly to the gold
instead of the underlying metallization. The Sn will scavenge the gold and
will form brittle Au/Sn intermetallics. I believe the industry is agreeing
that 3% gold by weight, in a joint, is an acceptable amount of gold that
will not cause any brittle Au/Sn intermetallic formation. The major concern
here is long term reliability.
Christopher J. Nash
Mid-West Technical Support Engineer
Indium Corporation of America
Phone #: (315) 853-4900 x7521
Fax #: (315) 853-1000
www.indium.com
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James
Sent: Friday, March 30, 2007 8:21 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering using Sn96
http://www.microwaves101.com/encyclopedia/solderchart.cfm
Go to the chart and see alloy 96.5Sn 3.5Ag
Jim Marsico
EDO Corporation
1250 New Horizons Blvd.
North Amityville, NY 11701
631-630-5079
[log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Donald Kyle
Sent: Friday, March 30, 2007 8:12 AM
To: [log in to unmask]
Subject: Re: [TN] Soldering using Sn96
Good morning Jim,
Do you have an URL for this CHART that we can look at?
For me Sn96 and gold works like a hose.
Donald Kyle
At 06:58 AM 3/30/2007, you wrote:
>Mornin' Jim!
>
>Really? That's strange...almost every downhole assembly that I've built
>has always been with ENIG plated PCB's...
>
>-Steve Gregory-
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of Marsico, James
>Sent: Friday, March 30, 2007 6:46 AM
>To: [log in to unmask]
>Subject: [TN] Soldering using Sn96
>
>Technetters:
>
>
>
>I happened to come across a solder chart from the Indium Corporation
and
>noticed that they do not recommend using Sn96 solder on gold-plated
>surfaces. Can anyone elaborate on this?
>
>
>
>Jim Marsico
>
>EDO Corporation
>
>1250 New Horizons Blvd.
>
>North Amityville, NY 11701
>
>631-630-5079
>
>[log in to unmask]
>
>
>
>
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