[SI-LIST] Re: Cu Thickness

Stuart,

I do not see board warpage being a factor unless there are extreme 
differences in copper layers of the PCB, or the fab house is not reputable.

Coming from the layout side, I have only had complaints from fab houses WRT 
tolerances and extended reliability at 2oz routing layers.  At that time it 
was the customer's request and I was able to talk them down with facts 
supplied or easily researched and sometimes a conference call that included 
an engineer specialized in signal integrity with reliable simulation tools.

In an attempt to make this reply short, my experience has been that 
increasing copper weight was not a favorable consideration in those designs. 
Having the backup of an experienced and proven signal integrity expert on 
call was a factor.

Sometimes you gotta bite the bullet and let the powers that be know it's not 
gonna be free.

Cheers!
Drew

----- Original Message ----- 
From: "Stuart Brorson" <sdb@xxxxxxxxxx>
To: "Dagmara Avanindra" <dagmara.avanindra@xxxxxxxxx>
Cc: "SI LIST" <si-list@xxxxxxxxxxxxx>
Sent: Wednesday, July 18, 2007 5:22 PM
Subject: [SI-LIST] Re: Cu Thickness


> Dagmara,
>
>> I would advise staying away from 2 oz copper thickness, espeacially if 
>> this
>> is a large board.
>> I have seen alot of reliability issues related to such a thick metal.
>
> I would be interested to hear in more detail about what type of
> reliability issues you have seen.  Is it board warpage?
>
> Stuart
>
>
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