Electronics Forum | Thu Oct 14 06:27:45 EDT 2004 | davef
a disturbed solder joint. * Extended/slow cool down ramps can result in surface texture => grainy solder joint. Second, the "BGA scaling" could be a reflection of: * Too little heat (incomplete solidification) OR * Too much heat (excess grain growt
Electronics Forum | Fri Apr 29 14:16:16 EDT 2011 | ppcbs
Below is the long explanation. This defect is most commonly found with BGA components, but can arrise with all components. I see it happening more now with lead free boards that are being assembled with a no clean flux. Best short term remedy is t
Technical Library | 2007-08-16 13:34:31.0
While experienced inspectors may be able to determine the aesthetic differences between a lead-free PCB assembly and a tin-lead version, one cannot rely on the "experienced eye". "Less wetting out to the pad edges" (Figure A) and "graininess and lack of shininess of the solder joint" (Figure B) are typical comments about some lead-free solder joints. However, in cases where a Nitrogen atmosphere was present during the reflow of the solder joint (Figure C), there will be little visual differences between the lead free alloys and their tin-lead counterparts.
Lead-Free BGA Rework-Transition News • Forums • SMT Equipment • Company Directory • Calendar • Career Center • Advertising • About • FREE Company Listing! Lead-Free BGA Rework-Transition Issues. Determining which assemblies are lead free
Advanced Thermal Interface Materials for Enhanced Flip Chip BGA Advanced Thermal Interface Materials for Enhanced Flip Chip BGA Increased functionality and performance requirements for microprocessors and ASICs have resulted in a trend
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/efd/resource-center/solder-glossary-of-terms
. B Ball Grid Array (BGA) A surface-mount component containing a processor, and sometimes additional components, where the bottom has a grid of connection points with solder balls attached
