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Subject:	Re: Bow & Twist
From:	Hans Hinners <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Thu, 19 Jul 2001 09:18:49 -0700
Content-Type:	text/plain
Parts/Attachments:	text/plain (68 lines)

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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