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June 1998

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Subject:
From:
Gary Ferrari <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 1 Jun 1998 11:37:22 -0500
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Al,

The formula in the IPC-D-275 was obsoleted by the IPC-SM-782, which in turn was
updated with the release of the IPC-SM-782A.

The formulas are available electronically in the IPC-EM-782 which is a spreadsheet
version of the tables in IPC-SM-782A. I encourage you to look at the web calculator
on the IPC web site: www. ipc.org. This is a realtime calcualtor in as that it
contains many user defined components and land patterns. These patterns follow the
land pattern principles defined in IPC-SM-782.

Users have reported that they save the html document and then run it through a filter
to directly drive thier CAD system land pattern generator.

Please contact me directly if you should need any further assistance.

Regards,


Gary Ferrari
Executive Director
IPC Designers Council
(860) 350-9300 Fax (860) 350-9309
[log in to unmask]

>>> "Arellano, Albert D" <[log in to unmask]> 06/01/98 12:54PM >>>
IPC support,

     I've been evaluating methods of inputting IPC standards into our CAD
systems software. The formula approach intrigued me because of it's minimal
amount of input required from a potential user. Problem is... from looking
through IPC-SM-782 manual (published in 1996) I don't find a straight
forward formula for a chip resistor. In your IPC-D-275 publication (dated
September 1991) I've found a formula for chip resistors within section
5.3.4.3 that's very clear. Upon using this formula, when I plug in values
from SM-782 subsection 8.1, heading 4.0, for the 1206 chip resistor, results
doesn't match the land pattern dimensions supplied on the following page.

    To shorten the request, what I would like is the formula used for
generating the chip resistor land pattern values for IPC-SM-782 manual. If
the formula does not reside in the SM-782 spec, please E-mail, or Fax it to
me.

If you have any questions.. please E-mail, or call me.

- Thanks for your help....   Al Arellano

E-mail = [log in to unmask]
Phone = (303) 581 2407
FAX = (303) 581 9973

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