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March 2007

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Subject:
From:
Hernefjord Ingemar <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Hernefjord Ingemar <[log in to unmask]>
Date:
Mon, 19 Mar 2007 15:57:25 +0100
Content-Type:
text/plain
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text/plain (140 lines)
That's something else! You did not tell what purpose. It's right, for
some multiGHZ bands, where low losses are wanted, we don't use nickel
plating because it's higher resistivity. Some nickel platings can have
10 times higher losses than Copper and Gold! In these cases, we use just
copper (no plating at all)if it's possible in environmental point of
view, or we use tinned copper lines. So, silver over copper is
theoretically right. And metallurgically spoken, silver on copper has
been used for centuries. What I don't understand is why add gold. Maybe
to avoid silver tarnish, if the package is not hermetic. 

Resistivity microOhm x cm :

Electronic solder       17-20
Pure Tin                9-11
Electroless nickel      50-100
Electrolytic nickel      8-10
Electrolytic Gold        2.5
Copper lines             1.8
Electrolytic Silver      1.6

When you look at the above table, you will understand why Silver.

Inge

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan, Geok Ang
Sent: den 19 mars 2007 14:28
To: [log in to unmask]
Subject: Re: [TN] "Greenish colour on traces"

 
This product is used in Microwave products, not micro-oven. Believed it
is due to the signal frequencies.

Best Regards
Geok Ang
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
Sent: Monday, March 19, 2007 8:31 PM
To: [log in to unmask]
Subject: Re: [TN] "Greenish colour on traces"

Geok
Any clue as to why someone wanted it plated this way? I think you are
having problems because your specification is incorrect.  

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan, Geok Ang
Sent: Sunday, March 18, 2007 2:49 AM
To: [log in to unmask]
Subject: Re: [TN] "Greenish colour on traces"

Accordingly to the specification it is copper-silver-gold plated.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dennis Fritz
Sent: Sunday, March 18, 2007 7:44 AM
To: [log in to unmask]
Subject: Re: [TN] "Greenish colour on traces"

 
In a message dated 3/17/2007 8:07:29 A.M. Eastern Daylight Time,
[log in to unmask] writes:

The  trace is copper-silver-gold plated. 


Are you sure it is not copper nickel gold?  I don't think silver is used
between copper and gold. 
 
Nickel salts are green.  Copper corrosion can look green-blue. 



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