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Date: | Mon, 15 Feb 2010 14:58:53 +0530 |
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Thanks for detailed explanation. I will follow-up with FAB house now
asking more about their capabilities.
Good day for ALL!!
Nagaraj
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
Sent: Friday, February 12, 2010 2:00 AM
To: [log in to unmask]
Subject: Re: [TN] High Aspect ratio issues
Hi Nagraj,
We have been testing some very high aspect ratio coupons. These are
coupons associated with circuit boards with the same attributes. We have
demonstrated reliability on coupons with 24:1 aspect ratio and higher.
That is a .006" hole in a .150" board drilled on a .020" grid.
There are circuit board houses that can produce those aspect ratios
reliably.
Circuit boards with those aspect ratios have been made on the full
gambit of hirel materials.
Your fabricator should know their limits. I would ask for demonstrated
capability, possibly request some reliability results on previous lots,
not the theoretical possibility of "bleeding edge" technology.
Sincerely,
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario
Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
[log in to unmask] <mailto:[log in to unmask]>
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Shanmugam, Nagaraj
Sent: February 10, 2010 5:51 AM
To: [log in to unmask]
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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