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Subject:	Re: 8mm pitch BGA
From:	"McGlaughlin, Jeffrey A" <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Wed, 25 Jun 2003 14:20:56 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (56 lines)

1.) I am going to assume that you mean 0.8mm, not 8mm for the BGA pitch,

2.) and that you are using 0.3mm diameter lands.

3.) Based on these criteria and on input from one of the fabricators I work
with I use 0.1mm drill / 0.45mm pad (internal and external) and .1mm trace
and space design rules.

4.) Remember to fan-out all unused balls to via, and teardrop all
connections and you should get a reasonable yield out of the design.


Jeffrey A McGlaughlin, CID
Engineering Designer
Battelle Memorial Institute
Columbus Ohio
http://www.battelle.org
[log in to unmask]


-----Original Message-----
From: Fred Dark [mailto:[log in to unmask]]
Sent: Wednesday, June 25, 2003 1:57 PM
To: [log in to unmask]
Subject: [DC] 8mm pitch BGA


Hello All, I Would like to know if anyone has used a BGA with a 8mm pitch.
What I'm looking for is some design recommendation... What via size to use
and trace width and clearances...

Thank's, Fred Dark Jr.

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