If I did not remember wrongly, IPC intend to update the std to include 0.5% if the board consist of BGAs.
 
Thanks and Regards,
~ Wee Mei ~

________________________________

From: TechNet on behalf of Grunde Gjertsen
Sent: Fri 9/12/2008 7:47 PM
To: [log in to unmask]
Subject: Re: [TN] Bow and Twist Measrement



Hi

0,75% but 0,5% is better if the design allows for it, especially on large
boards.

Best regards
Grunde





Paymon Sani <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
05.09.2008 19:54
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TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Paymon Sani <[log in to unmask]>


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Subject
[TN] Bow and Twist Measrement






Hello All,



IPC-A-610 Rev. D, Section 10.2.7 allows 1.5% and 0.75% Bow and Twist for
Through-hole and surface mount assemblies accordingly. What percentage
should I be applying if the assembly has mixture of surface mount and
through-hole components?



Thank you in advance,

Paymon Sani


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