what may be causing reflow issues with Q

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what may be causing reflow issues with QFN?

2/25/2017 10:54:11 PM

QFN assembled on a PCB indicates paramteric fails when tested. When the QFN on PCB is reflowed a second time, it recovers and passes testing. Visual, X-ray inspection revealed no anomalies. Cross-section images of solder joint revealed no anomalies (no traces of non-wetting). Any ideas what may be causing this issue?

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what may be causing reflow issues with QFN?

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