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November 2001

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Subject:
From:
David Fish <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 6 Nov 2001 22:02:36 -0800
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Continuing with a previous posting, Amkor uses the following pad to ball
size [mm] relationship:
Package||PBGA||PBGA||PBGA||SuperBGA||SuperBGA||fleXBGA ||fleXBGA
Pitch||1.5||1.27||1.0||1.27||1.0||1.0||0.8
Ball diameter||0.76||0.76||0.50||0.76||0.63||0.45||0.45
Pad size||0.63||0.63||0.45||0.63||0.55||0.45||0.30

IPC-7095 suggests the ball size reduction approach that a couple of others
mentioned
Nominal Ball Size ||Reduction||Nominal Land Dia||Variation
0.75mm ||25% ||0.55mm ||0.60-0.50mm
0.60mm ||25% ||0.45mm ||0.50-0.40mm
0.50mm ||20% ||0.40mm ||0.45-0.35mm

Dave Fish

----- Original Message -----
From: "Genny Gibbard" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, November 06, 2001 7:24 AM
Subject: [TN] BGA's in design


> OK, in the next few months we will probably design our first board that
uses
> a BGA, and we are jumping in with both feet.  This board will have a 304
> ball 1.27mm pitch, a 432 ball 1.27mm pitch, a 196 ball 1.00mm pitch and a
> 256 ball 1.00mm pitch.
> Are there any resources for free land patterns for these babies?  Or how
do
> you determine the pad size knowing the ball diameter and pitch?  Almost
> every place I found on the web with BGA patterns was selling them.  I was
> looking at the table of contents for the SM-782A standard and it only
> mentioned 1.27pitch.  Is the information in the standard easily scalable
to
> smaller pitch?  It could be a hard sell to convince my company to buy
> patterns, which means we will probably make our own which doesn't always
> make for very good DFM.
> Secondly, (I hesitate to ask this, because I may get a bunch of
> solicitations, but) does anyone have some recommendations for board
> fabricators in Canada that can handle the BGA requirements?  We have had
> questionable quality from most or all of our current board vendors at some
> time or another (remember the switched inner layers?)  and I am looking
for
> some new sources.
>
> Regards.
>
> Genny Gibbard (mailto:[log in to unmask])
>
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