Electronics Forum | Thu Dec 13 14:49:07 EST 2007 | 26560
Any recommendations/data on a superior flux to use for Package on Package assembly? Also, any guidelines on flux depth, viscosity, etc... are welcome.
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 Jan 24 12:11:00 EST 2011 | fdr4prez
Has there been any studies on the effect of the depth of the fluxing cavity for dipping PoP components? I've heard that the cavity should be 50% of the ball diameter and I also heard that the cavity should be 2/3 of the ball height (which may or may
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.
Electronics Forum | Wed Jan 26 10:43:32 EST 2011 | grahamcooper22
From our experience with our gel fluxes the depth of the flux cavity can be 30% ~ 70% of the ball diameter. You'll probably need to do some tests to find the optimum for your process. If you have really fast movement on pick and placement machine the
Electronics Forum | Fri Apr 11 12:42:29 EDT 2014 | emeto
Hello all, does any body place PoP parts? We are running them through a regular process(paste place reflow) and we don't have good rates on these. Mostly we observe opens at the sides of the part. We are thinking to purchase a flux feeder, but I wan
Electronics Forum | Wed Jun 03 16:26:37 EDT 2009 | wisch123
The most innovative new technology today is ccoming out of Fuji. They don't really advertise, so if you haven't gone to a show lately you might not have seen it. The machine is call the XPF-W and it sets the new standard for quality, accuracy, reliab
Electronics Forum | Wed Apr 30 14:41:55 EDT 2014 | emeto
Thank you all for the posts. From all I read lately I will probably try a different solder paste and if that doesn't work I will go for a flux feeder. I will keep you posted.
Electronics Forum | Mon Apr 25 09:15:18 EDT 2016 | soldertools
Hi Adamjs! Flux or paste is controlled at a depth of 50-60% per cent of the ball diameter prior to placement of a BGA or to place a PoP component on to a board or other device. For more details visit us at Soldertools.net
Electronics Forum | Tue Dec 21 13:27:47 EST 1999 | Vince Whipple
Charlie: As far as setting up a spray fluxer.. Are you spraying no-clean, voc free, water soluble? What you would want to do is to run a blank pcb through the fluxer and pop it out before the preheaters. Visually inspect for variations in uniformit
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