Thank you, that is interesting. Now I need to find out exactly what
processes the board houses are using.
Thanks to all.
Bob K.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rivera, Raye
Sent: Friday, August 19, 2011 3:46 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?1
313782786
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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