Industry News | 2011-05-12 22:13:47.0
Nordson DAGE showcased its newly developed 4000Plus pad cratering inspection system at Nepcon Shanghai.
Industry News | 2011-10-03 17:04:22.0
Nordson DAGE announces that Kamran Iqbal will present “Measuring the Reliability Risk of PCB Pad Craters” at the SMART Group BGA and Cleaning Reliability Conference.
Technical Library | 2016-10-20 18:13:34.0
Pad cratering failure has emerged due to the transition from traditional SnPb to SnAgCu alloys in soldering of printed circuit assemblies. Pb-free-compatible laminate materials in the printed circuit board tend to fracture under ball grid array pads when subjected to high strain mechanical loads. In this study, two Pb-free-compatible laminates were tested, plus one dicycure non-Pb-free-compatible as control. One set of these samples were as-received and another was subjected to five reflows. It is assumed that mechanical properties of different materials have an influence on the susceptibility of laminates to fracture. However, the pad cratering phenomenon occurs at the layer of resin between the exterior copper and the first glass in the weave. Bulk mechanical properties have not been a good indicator of pad crater susceptibility. In this study, mechanical characterization of hardness and Young’s modulus was carried out in the critical area where pad cratering occurs using nano-indentation at the surface and in a cross-section. The measurements show higher modulus and hardness in the Pb-free compatible laminates than in the dicy-cured laminate. Few changes are seen after reflow – which is known to have an effect -- indicating that these properties do not provide a complete prediction. Measurements of the copper pad showed significant material property changes after reflow.
Industry News | 2011-09-06 15:27:12.0
Nordson DAGE, a division of Nordson Corporation (NASDAQ: NDSN) will highlight its 4000Plus multi-purpose bondtester in Booth F05 within the Singapore Pavillion at NEPCON Vietnam
Technical Library | 2022-10-11 20:15:14.0
The increased temperatures associated with Pb-free processes have produced significant challenges for PWB laminates. Newly developed laminates have different curing processes, are commonly filled with ceramic particles or micro-clays and can have higher Tg values. These changes which are aimed at improving the materials resistance to thermal excursions and maintaining electrical integrity through primary attach and rework operations have also had the effect of producing harder resin systems with lower fracture toughness.
Industry News | 2011-11-20 13:14:27.0
Nordson DAGE has been awarded a Global Technology Award in the category of Test Equipment for its 4000Plus Bondtester Pad Cratering Inspection System.
Industry News | 2012-05-01 19:12:41.0
Nordson DAGE, a division of Nordson Corporation (NASDAQ: NDSN), will exhibit its 4000Plus Bondtester Pad Cratering Inspection System in Booth #212 at the upcoming Electronic Components and Technology Conference
Industry News | 2014-11-18 18:10:25.0
Nordson DAGE, a division of Nordson Corporation (NASDAQ: NDSN) have adopted the company’s hot pin pull test method for checking the integrity of solder ball attach on packages and PCBs in accordance with the industry standard IPC9708. This particular standard provides guidelines for bond testing to identify potential pad craters.
Industry News | 2014-10-18 12:11:01.0
Join us online for the most cost effective education in the industry, no travel, collect a team together in your conference room and join in the learning experience. Alternatively you can watch the sessions online at any time.
Technical Library | 2014-10-30 01:48:43.0
The ultimate life of a microelectronics component is often limited by failure of a solder joint due to crack growth through the laminate under a contact pad (cratering), through the intermetallic bond to the pad, or through the solder itself. Whatever the failure mode proper assessments or even relative comparisons of life in service are not possible based on accelerated testing with fixed amplitudes, or random vibration testing, alone. Effects of thermal cycling enhanced precipitate coarsening on the deformation properties can be accounted for by microstructurally adaptive constitutive relations, but separate effects on the rate of recrystallization lead to a break-down in common damage accumulation laws such as Miner's rule. Isothermal cycling of individual solder joints revealed additional effects of amplitude variations on the deformation properties that cannot currently be accounted for directly. We propose a practical modification to Miner's rule for solder failure to circumvent this problem. Testing of individual solder pads, eliminating effects of the solder properties, still showed variations in cycling amplitude to systematically reduce subsequent acceleration factors for solder pad cratering. General trends, anticipated consequences and remaining research needs are discussed
.gif)
