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February 2002

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Subject:
From:
ATI ProcessGuy <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 18 Feb 2002 18:10:50 -0500
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Per IPC 2222 (Feb 1998):

Page 6, table 4-2 lists a selection chart for various Registered FR4 types.
I am familiar with FR4-04 and -06, however, it appears that for boards
requiring to be very flat while still trying to watch cost, I would be
better off specifying something like FR-4-17 or -19.

It appears that the cost for 17 is middle of the road and cost for 19 is
good.  The kicker is that the farther down the table I go, it appears that
the minus is the laminate is more difficult to drill.

Is there articles anywhere out there regarding costs once we leave the
FR-04-06, FR-04-04 material and start going into the -17 or 19 etc?

What about the accuracy of the chart?  It states material availability is
good.  Anyone out there had experience with this?

Reason I ask, I have a 488 pin BGA 1 inch square I have to solder and they
are asking me what to spec.  Thanks in advance.


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