Subject: | |
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Reply To: | TechNet E-Mail Forum. |
Date: | Thu, 19 Jul 2001 09:18:49 -0700 |
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Hey Colin,
If ya construct it right you shouldn't have a problem with bow & twist.
Hans
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Process Engineer
Toppan Electronics, Inc.
770 Miramar Road
San Diego, CA 92126
(858) 695 - 2222 ext. 241
(858) 695 - 6823 fax
[log in to unmask]
-----Original Message-----
From: Colin Weber [mailto:[log in to unmask]]
Sent: Wednesday, July 18, 2001 9:19 PM
To: [log in to unmask]
Subject: [TN] Bow & Twist
Folks,
Is there a method of determining the maximum permissible size of two board
types?
a) A SMT PCB containing Fine pitch QFP devices
b) A SMT PCB containing PBGA 388pin 1.27mm pitch & Fine pitch QFPs
with respect to Bow and Twist.
I am interested in how the thickness of the board relates to maximum bow
and twist.
I'd like to determine this before I design the layout, rather than find out
it is wrong
after performing the tests of IPC-6012A, IPC-TM-650 2.4.22.
Regards,
Colin Weber
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