Viscometry 101 (Ball Attach Flux - Cone & Plate or T-bar?)
Photo courtesy of www.chemistryexplained.com As you may have seen on product data sheets or specifications, each flux is......
Ball Attach
BGA Solder Joint Reliability
“A picture is worth a thousand words.” Reliability is worth even more…?xml:namespace prefix = o ns = "urn:schemas-micros...
Transfer Efficiency of Ball Attach Fluxes
This is a chart of flux transferred in a ball attach process over a 3 day span. ......
BGA Red Dye Penetrant Testing
Ok, so it happened again. Another urgent request was brought to me for action. This time it was a customer who had performed a Red Dye Penetration......
Head-in-Pillow Defects 2: Supply Issues
Head-in-pillow defects caused by everything before the components go on-line can be grouped into Supply Issues. Some specific issues within this group...
Safety Net
It’s always good to be cautious when dealing with high-reliability devices. No-clean ball attach and package-on-package fluxes are usually desig...
Ninjas and Flux
Ninja are known for their ability to combine two very different properties – power and stealth. Flux was never very good at this though, we usua...
Many shades of “Green”
Last week I was asked “Is this flux green?” – regarding one of our leading ball attach fluxes. My first reaction was – ...
I Make House Calls
If you need me to troubleshoot your ball attach process, PoP process, flip-chip assembly process, or die-attach process, I’d be happy to come an...
Ball Attach Surface Finishes
Just incase you were wondering, here are the wetting results you can expect when soldering Pb-free spheres to different surface finishes. The chart sh...
Package-on-Package Reflow (5/5)
Okay, you’re at the final stage of Package-on-Package assembly. Simply heat per the reflow profile suggested by your solder manufacturer (hopefu...
Control Your Materials, or They Will Control You (part 1)
Package-on-Package solder paste is a relatively new concept in the solder industry. With limited material sets, we need to be able to capitalize on th...