Jeff,

I recently discussed PCM cards with Lisa Williams at IPC.  IPC has a proposal 
draft in circulation right now.  It is IPC-2224.
She can probably get you a copy of this.

To answer your question though, most designs I have looked at incoporate the 
use of 0.5 oz. copper innerlayers.  This helps insure the best thickness 
uniformity across the card.  It also allows the use of single ply bonding 
sheet construction. 

Heavier copper weights would tend to imbed more of the available dielectric 
thickness of the bonding sheets.

I hope this answers your question.

Vern

"Baldwin, Jeff A" <[log in to unmask]> Wrote:
| 
| 
| Hello.  Just a quick question about PCMCIA Cards.  What 
| copper weight should 
| we specify to our PCB vendor?  Is there a standard or 
| common weight for thin 
| boards?  Thank you for your help.
| 
| Jeff Baldwin
| Harris RF Communications
| [log in to unmask]
| 
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Vern Pursley
Merix Corporation
Phone:503-359-9300 ext 54404; FAX: 503-357-1181
[log in to unmask]

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