Rigid cores are done all the time with mixed copper weights. If it s a flex laminate it's not common.
Thank you, Jim Mahoney
Mass Design Inc.
Applications Engineer
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Lehmicke, Michael
Sent: Friday, April 27, 2012 9:11 AM
To: [log in to unmask]
Subject: Re: [TN] Core with uneven Copper foil thickness
Ravinder,
It should not be an issue. A PCB manufacturer should be able to use a 2 oz. double core and etch the copper off one side.
Mike
Mike Lehmicke
Molex Copper Flex products
22 Empire Drive
St. Paul, MN 55103
651-846-7728
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Thursday, April 26, 2012 7:20 PM
To: [log in to unmask]
Subject: Re: [TN] Core with uneven Copper foil thickness
Hi All,
Thanks to all who have responded. Perhaps I should add that this is a 12-layer PCB, and the 2 oz Copper layer will be used for Power/Ground only. The signal layers will be 1/2 oz thick.
Regards
Ravinder Ajmani
Principal HW Engineer, Signal Integrity / EMI HGST, a Western Digital company [log in to unmask]
"Lehmicke, Michael" <[log in to unmask]> Sent by: TechNet <[log in to unmask]>
04/26/2012 02:57 PM
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Re: [TN] Core with uneven Copper foil thickness
Ravinder;
Although uneven copper thicknesses on a core are more common that one would expect, 1/2 oz. versus 2 oz. can cause some issues during the etching process, depending on trace pitch and tolerances. One would need to see the gerber files to determine if it would be an issue.
There are ways to get around this issue on Multilayer flex, but if this is just a double layer flex it has to be addressed. There are techniques, using a combination of additive/subtractive processes, to build up thickness during processing on just one side. Again, the trace widths and tolerances can influence this type of processing.
Mike Lehmicke
Molex Copper Flex products
22 Empire Drive
St. Paul, MN 55103
651-846-7728
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of [log in to unmask]
Sent: Thursday, April 26, 2012 4:40 PM
To: [log in to unmask]
Subject: [TN] Core with uneven Copper foil thickness
Hi,
We are considering a layer stackup which uses Cores with uneven Copper foil thickness. Copper on one side is 1/2 oz and on the other side is 2 oz. Apart from the availability/cost considerations are there other issues with using such a Core.
I will appreciate the opinions of experts on this.
Thanks.
Regards
Ravinder Ajmani
Principal HW Engineer, Signal Integrity / EMI HGST, a Western Digital company [log in to unmask]
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