Capacitors on the bottom can be a problem for those who want to X-ray their BGA's, especially for the larger types (i.e. 1812's).

Kind regards,

Daan Terstegge
Unclassified mail
Personal Website: http://www.smtinfo.net

>>> "Misner, Bruce" <[log in to unmask]> 10/27 3:11 pm >>>
I deal with filter caps on the bottom and they have not been a problem for
rework.

Regards,
Bruce Misner

> ----------
> From:         Kuczynski, Michael @
> SPACENAV[SMTP:[log in to unmask]] 
> Reply To:     TechNet E-Mail Forum.;Kuczynski, Michael @ SPACENAV
> Sent:         Friday, October 27, 2000 9:38 AM
> To:   [log in to unmask] 
> Subject:      [TN] BGA/caps placement
>
> I'd like some opinions on capacitor placement for BGAs.
>
> Where are you placing the filter caps; top or bottom (we're using 0508 and
> 0603)
> If on the top, how far away are you placing them. (we're using a .150
> keepout for rework) and are they helping
> What problems do the rework guys have with the caps on the bottom
>
> Any insights/thoughts on this subject would be appreciated
> There seems little, middle ground on this issue for engineering and mfg.
>
> Michael Kuczynski    Librarian/Sr. Designer
> L3 Communications    1-201-393-2122 (Ph)
> Space & Navigation   1-201-393-6681 (Fax)
> 699 Rt. 46 E         Mail Stop PL1/J8
> Teterboro,NJ 07680
> [log in to unmask] 
>
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Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
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information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
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