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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