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October 2000

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Subject:
From:
Werner Engelmaier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 18 Oct 2000 16:31:27 EDT
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Hi Mark,
In a message dated 10/18/0 10:59:08, [log in to unmask] writes:
>1.) Should the pad on the bottom of a component be rectangular or square
>or is this important?
It is common to use circular pads, but there is ne reason not to use square
or rectangular ones.
In fact, test at Bell Labs have shown that one gets a better solder joint
reliability with solder joints resulting from rectangular pads on component
and PWB.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com
In a message dated 10/18/0 10:59:08, [log in to unmask] writes:
>Does IPC address the following questions.  We design and build SMT
>components for pcb construction.  If so, could somebody please specify
>where these are referenced?

>1.) Should the pad on the bottom of a component be rectangular or square
>or is this important?

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