Electronics Forum | Tue Dec 01 07:24:44 EST 1998 | Earl Moon
| Hi folks , | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspection
Electronics Forum | Tue Dec 01 07:54:49 EST 1998 | kallol chakraborty
| | Hi folks , | | Lately we are seeing a lot of rawcards with black spots on the pads - most of them have Au finish(immersion gold) . We did a lot of inspecton after wave solder and found that only (fine pitch) QFP are affected the most. Our inspec
Industry News | 2010-08-31 12:11:44.0
Eastern Europe's growing electronics assembly industry faces new challenges, especially with the adoption of lead-free technology. To connect manufacturers with solutions to these challenges, IPC — Association Connecting Electronics Industries® is holding the IPC Electronics Assembly Quality & Reliability Conference in Budapest, Hungary on 6–7 October, 2010.
Industry News | 2018-12-08 03:29:29.0
SMT Dictionary – Surface Mount Technology Acronym and Abbreviation
Technical Library | 2013-01-17 15:37:21.0
A problem exists with electroless nickel / immersion gold (ENIG) surface finish on some pads, on some boards, that causes the solder joint to separate from the nickel surface, causing an open. The solder has wet and dissolved the gold. A weak tin to nickel intermetallic bond initially occurs, but the intermetallic bond cracks and separates when put under stress. Since the electroless nickel / immersion gold finish performs satisfactory in most applications, there had to be some area within the current chemistry process window that was satisfactory. The problem has been described as a 'BGA Black Pad Problem' or by HP as an 'Interfacial Fracture of BGA Packages…'[1]. A 24 variable experiment using three different chemistries was conducted during the ITRI (Interconnect Technology Research Institute) ENIG Project, Round 1, to investigate what process parameters of the chemical matrix were potentially satisfactory to use and which process parameters of the chemical matrix need to be avoided. The ITRI ENIG Project has completed Round 1 of testing and is now in the process of Round 2 TV (Test Vehicle) build.
SMT Express, Volume 5, Issue No. 8 - from SMTnet.com Equipment Impacts of Lead Free Wave Soldering The popular tin (Sn) rich lead free solders are causing severe corrosion to many of the materials used in today�s Wave Solder systems
An Investigation of Whisker Growth on Tin Coated Wire and Braid SMTnet Express August 2, 2012, Subscribers: 25335, Members: Companies: 8941, Users: 33403 An Investigation of Whisker Growth on Tin Coated Wire and Braid First published in the 2012
ASYMTEK Products | Nordson Electronics Solutions | https://www.nordson.com/en/divisions/efd/resource-center/solder-glossary-of-terms
) Branch or snowflake-like patterns of metal that grow on surfaces between conductors. It requires a chemical reaction capable of dissolving the metal into a solution of metal ions, which are then redeposited by electro-migration in the presence of an electromagnetic field
Heller Industries Inc. | https://hellerindustries.com/wp-content/uploads/2022/06/Optimizing-Reflowed-Solder-TIM-sTIMs-Processes-for-Emerging-Heterogeneous.pdf
. On both sides of the joint, indium is anchored to nickel with a protective gold finish. Nickel forms a stable intermetallic bond with indium
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