Electronics Forum | Fri Dec 21 15:50:54 EST 2007 | rwyman
Hi smtdude- I'm no expert at PoP (yet!) as we've only done a few weeks worth of experiments for a new customer but what i can tell you is 25-50% of the ball height (not diameter) is a good rule of thumb for the flux depth, at least to start. I can s
Electronics Forum | Mon Apr 21 10:50:13 EDT 2014 | cyber_wolf
The top PoP part is what gets dip fluxed or dip pasted. We have had warping issues with these components before but it is almost always the top part. My guess would be bad components if your reflow profile and print process is good to go.