Latent shorts on QFN package

2/28/2017 6:45:31 PM

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

3/2/2017 6:45:31 PM

This post is perfect for what I need. Thanks!

branko.j.kovac

3/2/2017 6:45:31 PM

Useful!

francois.jacob.hello

3/2/2017 6:45:31 PM

I am going to keep checking for new writings.

ilmandorlone

3/2/2017 6:45:31 PM

What you share on your post is quite useful.

You might like

Jorge Arizaga

  • Threads

    4

  • Following

    0

  • Followers

    0

PCB Prototype

PCB Instant Quote

x mm

Quantity

Quote Now

PCB Assembly

SMT-Stencil