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June 1998

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Subject:
From:
"Arellano, Albert D" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 11 Jun 1998 17:46:06 -0500
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IPC support,

    I would like the exact 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 it, Fax it, or explain how I could get ahold
of it.

    FYI - 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 find 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.

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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