New Equipment | Test Equipment - Bond Testers
Nordson DAGE is the leading provider of award winning bond testing equipment. The second generation 4000Plus bondtester continues to be the most advanced bondtester on the market whilst the 4000 Optima is optimized for fast, accurate and reliable bon
Technical Library | 2015-08-13 15:52:40.0
Pad cratering has become more prevalent with the switch to lead free solders and lead free compatible laminates. This mainly is due to the use of higher reflow temperature, stiffer Pb-free solder alloys, and the more brittle Pb-free compatible laminates. However, pad cratering is difficult to detect by monitoring electric resistance since pad cratering initiates before an electrical failure occurs. Several methods have been developed to evaluate laminate materials' resistance to pad cratering. Pad-solder level tests include ball shear, ball pull and pin pull. The detailed methods for ball shear, ball pull, and pin pull testing are documented in an industry standard IPC-9708. Bansal, et al. proposed to use acoustic emission (AE) sensors to detect pad cratering during four-point bend test. Currently there is an industry-working group working on test guidelines for acoustic emission measurement during mechanical testing.
Industry News | 2017-01-05 04:27:37.0
BGA Inspection & Defect Photo Album (Can be downloaded) The photo CD-ROM album featuring over 280 colour images on BGA, materials, inspection and defects and is available to allow engineers to create their own training material, PowerPoint files, process documents, technical articles and standards. The disk includes examples of the following:
Industry Directory | Manufacturer
Scotle Founded in 2006,a manufacturer for Scotle BGA rework stations, and other SMD rework accessories. Scotle accept OEM and ODM worldwide. Top quality, best service is always the persuit of Scotle.
Technical Library | 2015-02-12 16:57:56.0
Electronic systems are known to be affected by the environmental and mechanical conditions, such as humidity, temperature, thermal shocks and vibration. These adverse environmental operating conditions, with time, could degrade the mechanical efficiency of the system and might lead to catastrophic failures.The aim of this study is to investigate the mechanical integrity of lead-free ball grid array (BGA) solder joints subjected to isothermal ageing at 150°C for up to 1000 hours. Upon ageing at 150°C the Sn-3.5Ag solder alloy initially age-softened for up to 200 hours. This behaviour was linked to the coarsening of grains. When aged beyond 200 hours the shear strength was found to increase up to 400 hours. This age-hardening was correlated with precipitation of hard Ag3Sn particles in Sn matrix. Further ageing resulted in gradual decrease in shear strength. This can be explained as the combined effect of precipitation coarsening and growth of intermetallic layer. The fractured surfaces of the broken solder balls were also investigated under a Scanning Electron Microscope. The shear failures were generally due to ductile fractures in bulk solders irrespective of the ageing time.
Industry Directory | Equipment Dealer / Broker / Auctions
CMTec is highly specialized in dealing with assembly equipment. We support BESI (ESEC, Datacon), Kulicke & Soffa, Hesse & Knipps, F&K Delvotec, Orthodyne, ASM, Dage and others. CMTec delivers 'turn-key' projects worldwide.
BP 256 ball attach adhesives have been designed to enhance solder joint reliability and eliminate cleaning process for ball bumping process of CSP, BGA, Flip chip and PoP (package on package) and so on, particularly for lead free application. During
Technical Library | 2020-09-23 21:37:25.0
The need to minimise thermal damage to components and laminates, to reduce warpage-induced defects to BGA packages, and to save energy, is driving the electronics industry towards lower process temperatures. For soldering processes the only way that temperatures can be substantially reduced is by using solders with lower melting points. Because of constraints of toxicity, cost and performance, the number of alloys that can be used for electronics assembly is limited and the best prospects appear to be those based around the eutectic in the Bi-Sn system, which has a melting point of about 139°C. Experience so far indicates that such Bi-Sn alloys do not have the mechanical properties and microstructural stability necessary to deliver the reliability required for the mounting of BGA packages. Options for improving mechanical properties with alloying additions that do not also push the process temperature back over 200°C are limited. An alternative approach that maintains a low process temperature is to form a hybrid joint with a conventional solder ball reflowed with a Bi-Sn alloy paste. During reflow there is mixing of the ball and paste alloys but it has been found that to achieve the best reliability a proportion of the ball alloy has to be retained in the joint, particular in the part of the joint that is subjected to maximum shear stress in service, which is usually the area near the component side. The challenge is then to find a reproducible method for controlling the fraction of the joint thickness that remains as the original solder ball alloy. Empirical evidence indicates that for a particular combination of ball and paste alloys and reflow temperature the extent to which the ball alloy is consumed by mixing with the paste alloy is dependent on the volume of paste deposited on the pad. If this promising method of achieving lower process temperatures is to be implemented in mass production without compromising reliability it would be necessary to have a method of ensuring the optimum proportion of ball alloy left in the joint after reflow can be consistently maintained. In this paper the author explains how the volume of low melting point alloy paste that delivers the optimum proportion of retained ball alloy for a particular reflow temperature can be determined by reference to the phase diagrams of the ball and paste alloys. The example presented is based on the equilibrium phase diagram of the binary Bi-Sn system but the method could be applied to any combination of ball and paste alloys for which at least a partial phase diagram is available or could be easily determined.
Career Center | Space Coast, Florida USA | Engineering,Research and Development
Board Level Assembly BGA Expert! We are in need of an Electronic Packaging or Advanced Manufacturing Engineer to work with the Advanced Manufacturing Technology Group of a major Florida based Communications company. Support IR&D and Program activit
Career Center | Milpitas, California USA | Engineering,Production,Quality Control,Research and Development,Technical Support
Winslow Automation, Inc. (aka Six Sigma), an industry leader in electronic component interconnect technology & related test and failure analysis services, is seeking individuals specializing in materials lab testing to join our team. We have openin
