Latent shorts on QFN package

2017/2/28 18:45:31

I'm having shorts appear on my QFN packages between pins, usually only after a week or so of power-on operation. The shorts are 1K and slowly down to hard shorts over time. Typically a defective part will have failures on multiple pins. I tried having my assembly house switch to a "no-clean" process, however it hasn't eliminated the problem. I'm using Lead-free solder.
Does this problem seem familiar to anyone? I need minimally a test to tell me whether any given assembly is defective, and ideally a defect-free assembly method.

ErikLee

2017/3/2 18:45:31

This post is perfect for what I need. Thanks!

branko.j.kovac

2017/3/2 18:45:31

Useful!

francois.jacob.hello

2017/3/2 18:45:31

I am going to keep checking for new writings.

ilmandorlone

2017/3/2 18:45:31

What you share on your post is quite useful.

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