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June 2000

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Subject:
From:
Barbara Burcham <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 29 Jun 2000 10:44:46 -0500
Content-Type:
text/plain
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text/plain (128 lines)
Nice Web site, Bill!
Thanks,
Barbara J. Burcham, CID
PCB Designer
Fairfield Industries
Sugar Land, TX 77478
281-275-7687 Work
281-275-7550 Fax
[log in to unmask]


-----Original Message-----
From: Brooks Bill [mailto:[log in to unmask]]
Sent: Thursday, June 29, 2000 10:26 AM
To: [log in to unmask]
Subject: Re: [TN] BGA pads size


I have put together a little website to gather together some PCB Designer
reference materials for Designers... in there under 'programs and
calculators' I have a link to a site that has Ball Grid array layout
information that you might find useful... it's a document that Motorola put
out on the web...
http://home.fda.net/bbrooks/pca/pca.htm

here's a direct link to the Motorola page -
http://www.mot-sps.com/solutions/wired/pbga/layout.html#geometry

- Bill Brooks


-----Original Message-----
From: Ryan Grant [mailto:[log in to unmask]]
Sent: Thursday, June 29, 2000 7:15 AM
To: [log in to unmask]
Subject: Re: [TN] BGA pads size


Stella,
        PCB pad sizes should match the CSP pad size.  If you can't find that
out from the component manufacture, a good rule of thumb is to use pads that
are 80% of the size of the ball.

Thanks

Ryan Grant
Advanced Technology Engineer
MCMS
(208) 898-1145
[log in to unmask]


> -----Original Message-----
> From: Stella Neyman [SMTP:[log in to unmask]]
> Sent: Wednesday, June 28, 2000 12:08 PM
> To:   [log in to unmask]
> Subject:      [TN] BGA pads size
>
> Technetts,
> Please help.
> I have to do the PCB layout for 8mm x 8 mm BGA. 108 Balls size of 0.3 mm,
> spacing is 0.5 mm.
> Could somebody advise what would be the pads size? What is would be vias
> diameter?
> Please advise.
> Thank you,
> Stella
>
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