Technical Library | 2015-08-20 15:18:38.0
Increasing system integration and component densities continue to significantly reduce the opportunity to access nets using standard test points. Over time the size of test points has been drastically reduced (as small as 0.5 mm in diameter) but current product design parameters have created space and access limitations that remove even the option for these test points. Many high speed signal lines have now been restricted to inner layers only. Where surface traces are still available for access, bead probe technology is an option that reduces test point space requirements as well as their effects on high speed nets and distributes mechanical loading away from BGA footprints enabling test access and reducing the risk of mechanical defects associated with the concentration of ICT spring forces under BGA devices. Building on Celestica's previous work characterizing contact resistance associated with Pr-free compatible surface finishes and process chemistry; this paper will describe experimentation to define a robust process window for the implementation of bead probe and similar bump technology that is compatible with standard Pb-free assembly processes. Test Vehicle assembly process, test methods and "Design of Experiments" will be described. Bead Probe formation and deformation under use will also be presented along with selected results.
Used SMT Equipment | Adhesive Dispensers
Manufactured in 2005 Pass-through conveyor, chain type Single head: SC-200 slim swirl applicator Tri-Mode Swirl Box - dispenses conformal coating materials in a bead, monofilament, or swirl pattern.
General Purpose (SMT): Chip Inductors and Ferrite Chip Beads
Industry Directory | Manufacturer
repair and manufacutre of ultrasonic cleaners
Super powerful expanding desiccant to keep boards & microelectronics moisture free.... Much different than Silica Sand Beads. Also supplier of corrosion prevention treatments that are alternatives to Conformal coatings.
Industry Directory | Manufacturer
Precision dispensing systems, meter-mix equipment, curing ovens, & contract gasketing services.
Parts & Supplies | Pick and Place/Feeders
We can supply all kinds of lamp bead suction nozzle for LED light production line, and we can customize different Lamp bead nozzle accordering to customer's demand. Other Models nozzle are in stock,You can choose you need model(All our products are
Parts & Supplies | Pick and Place/Feeders
We can supply all kinds of lamp bead suction nozzle for LED light production line, and we can customize different Lamp bead nozzle accordering to customer's demand. Other Models nozzle are in stock,You can choose you need model(All our products are
Industry News | 2002-04-01 07:50:34.0
Announces That it Has Successfully Completed Qualification Testing
Rugged, fast and consistent – even with high inlet pressures Dos GP systems are the first choice for applications requiring 1C, high viscosity, unfilled, non-abrasive potting material, making them the best choice for applying continuous beads.