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Wed, 06 Nov 1996 09:54:30 -0800 |
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| From [log in to unmask] Wed Nov 6 10: |
48:48 1996 |
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RICK VERNON wrote:
>
> What are typical values expected during a peel test of gull wing leads of
> 36 to 38 mil width? We are experiencing great variation in peel strength,
> on the order of approximately 4 lbs to 12 lbs for the same lead location on
> different boards (D-pak style package). Profiles have been checked and
> are "typical", solder paste from Alpha is fresh. I am looking for info on
> what could be causing this joint strength variability in our process.
>
> Thanks in advance.
> Rick Vernon, Quality Engineer
> [log in to unmask]
> Pheonix International Corp.
>
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Some of the things you could look into are:
1. Contamination/oxidation on Leads.
2. Contamination/oxidation on SMT pads.
3. Formation of fillet around the lead.
4. Growth of intermetallic on low pull lead joints.
5. Co-planarity measurements.
--
Pratap Singh
Tel./Fax: 512-255-6820
e-mail: [log in to unmask]
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