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November 2001

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fullname <[log in to unmask]>
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TechNet E-Mail Forum.
Date:
Tue, 13 Nov 2001 09:59:52 +0800
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I have been leaving through IPC-2221 on aspect ratio but did not have
any value on this information. Can some kind soul provide the answers to
my questions :

1. what is the current achievable/acceptable aspect ratio for plated
through hole?
2. Is there a different on the aspect ratio for PTH via? If yes, please
provide.
3. What is the aspect ratio for micro via of HDI Type 1 and Type II
board?
4. How about the aspect ratio for blind via on normal PTH board?

A big THANK YOU to all who will be responding!
Regards - Wee Mei

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