Ask eastern at japan if ciena got enough volume. Use actual board with actual design for quote. You might get somewhere. If you want to do theoretical study or modeling, go to the jesso roadmap or ibiden or best in the bread roadmaps and looking down for few years what those guys forecast can do. As far as I know eastern is the best house for drill. I am not blame them if they are not telling you can or can not do with phishing question casting a wide net as yours. My 1.8 cents.
--------------------------
Sent using BlackBerry
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Thu Feb 11 01:18:55 2010
Subject: Re: [TN] High Aspect ratio issues
thanks for the answers.. Still I am looking for more information.
Say if my Aspect ratio is 12( assuming this is max capability of the FAB
house).
By Definition ; Aspect ratio = board thickness/ min drill size.
Can the Fab house able to make it drill with different board materials
like FR4, Teflon, Rogers - is the material strength of Prepregs not
considered?
Thanks,
Nagaraj
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier
Sent: Wednesday, February 10, 2010 9:03 PM
To: [log in to unmask]
Subject: Re: [TN] High Aspect ratio issues
Hi Nagaraj,
Indeed, drill bit yield/ hole wall quality goes down with smaller drill
diameters. Typically, your drill diameters are driven by the density of
your design.
Smaller holes are also more difficult to plate good copper into.
Werner
-----Original Message-----
From: Shanmugam, Nagaraj <[log in to unmask]>
To: [log in to unmask]
Sent: Wed, Feb 10, 2010 5:51 am
Subject: [TN] High Aspect ratio issues
Technetters:
I am working on the drill size selection I choose them based on
acceptable aspect ration by Fab house.
the reason being(to my knowledge) the drill bit yield reduces if we go
for higher aspect ratio -
Wondering what other cause prevent to go for high aspect ratio.
TIA,
Nagaraj
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