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August 2011

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From:
Robert Kondner <[log in to unmask]>
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Date:
Fri, 19 Aug 2011 09:58:34 -0400
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Would NO DESMEAR  result in connection of barrels to planes (perhaps un-reliable connections)  or would many internal connections be open?

Is it the case that some low cost shops would NOT DESMEAR to reduce costs and get away with it?

Thanks,
Bob K.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pete
Sent: Friday, August 19, 2011 9:37 AM
To: [log in to unmask]
Subject: Re: [TN] Is Desmear or Etchback Optional?

It's not actually "kissing away 2 mils"

When you start adding up tolerances for drill hole size, location, layer registration, process allowance.... you can easily come up with 2 mils difference from one shop to another.  10 mils hole to copper shouldn't be difficult at all for a good fab shop.


Not that it's really possible, but any shop so particular with their drilling that they wouldn't require some sort of desmear would be particular enough to desmear anyway.

Pete

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