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August 2011

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Subject:
From:
Victor Hernandez <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 23 Aug 2011 09:21:35 -0500
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text/plain (273 lines)
I saw the pdf report photo that was posted on IPC Photo Site TechNet Forum.   Was the sample chemically etch to identify IP sep?   Would like to see higher mag snapshot

victor

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye
Sent: Friday, August 19, 2011 2:46 PM
To: [log in to unmask]
Subject: Re: [TN] Is Desmear or Etchback Optional?

Hi Victor,



Certainly! I uploaded a copy of the lab report to groupsite. Here is the link.



http://ipc-technet.groupsite.com/uploads/files/x/000/069/daa/SmearRept.pdf?1313782786



Best regards,

Raye Rivera





-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Friday, August 19, 2011 10:31 AM
To: [log in to unmask]
Subject: Re: [TN] Is Desmear or Etchback Optional?



Can you so kindly share the above stated desmear artifact on a cross section.   A picture is worth 1000 words.



Victor,



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye

Sent: Friday, August 19, 2011 11:29 AM

To: [log in to unmask]

Subject: Re: [TN] Is Desmear or Etchback Optional?



Hi Bob,



We have seen insufficient desmear here and it does create an unreliable connection. A properly prepared microsection will show the defect clearly, which is how we (or rather, the lab we contract) caught it.



I suppose it is possible that some shop might entirely skip desmear to save money, but any shop with that attitude would not last long. It is a key part of the process and skipping it would absolutely result in defective and rejectable boards.



Best regards,

Raye Rivera





-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner

Sent: Friday, August 19, 2011 6:59 AM

To: [log in to unmask]

Subject: Re: [TN] Is Desmear or Etchback Optional?



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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