News
The National Physical Laboratory (www.npl.co.uk) has announced the launch of a new report, "Susceptibility of Glass-Reinforced Epoxy Laminate to Conductive Anodic Filamentation," written by Alan Brewin, Ling Zou and Christopher Hunt.
Conductive anodic filamentation (CAF) is a subsurface failure mode for woven glass-reinforced laminate (FR4) materials, in which a copper salt filament grows and results in a consequential electrical short between plated through hole walls or adjacent copper planes. In the study, FR4 laminates in the form of high PTH density multi-layer test circuits were exposed to different manufacturing conditions and studied for resistance to CAF initiation and growth.
CAF performance was assessed using high temperature and humidity conditions to promote failures, with a voltage applied across adjacent vias. By applying a range of voltages and via geometries, the basis for a performance map for laminates was obtained for use in materials comparison. The changes due to exposure of laminates to lead-free temperatures and other processing steps were then examined using the technique and a number of important recommendations were made to minimize the possibility of CAF initiation and growth.
All reports released by the Electronics Group at NPL can be searched and downloaded free from: www.npl.co.uk/ei/publications.
Copyright 2004, UP Media Group. All rights reserved.
Sanmina-SCI Corp. (San Jose, CA), a global electronics manufacturing services (EMS) company, and Agilent Technologies Inc. (Palo Alto, CA), have announced a new technique for rapidly generating high-resolution, sub-surface 3-D scans of complex multilayer backplane and printed circuit board assemblies (PCBAs).
Using Agilent's 5DX Series 5000 automated x-ray system, the new method verifies how well press-fit connectors with compliant pins are positioned within plated-through-hole (PTH) conduits.
Featuring multilayer construction that can exceed 48 layers, Sanmina-SCI's backplanes deploy high-density, press-fit connectors into PTH conduits with diameters that often measure 0.022 in. and smaller.
Kent Dinkel, Agilent's Imaging marketing manager, Automated Test Group, said, "Our 5DX system was designed to be a powerful x-ray tester always looking for new problems to solve. We salute Sanmina-SCI for galvanizing an application that has enabled the industry's first sub-surface 3-D scans of complex backplanes in production environments."
Dinkel also noted that press-fit connectors having compliant pins are becoming more widely used in a number of PCBA markets.
Sanmina-SCI noted that when multiple component types, including surface-mount devices, populate a backplane or PCBA, the new inspection method can scan the entire backplane—both surface and sub-surface simultaneously—to check solder contacts of components as well as press-fit connector contact integrity.
Copyright 2004, UP Media Group. All rights reserved
GE Commercial Finance, Global Electronic Solutions (GES, San Diego, CA), an equipment lifecycle management supplier, has appointed Roger Innes as president and CEO. In this position, Innes will be responsible for overseeing and directing all of GES on a global basis and ensuring continued GES growth. Under his leadership, GES will continue to add staff worldwide and develop new products and services.
Previously, Innes was managing director of capital markets and business expansion for GES. Building upon his experience in the technology equipment leasing and finance industries, Innes will continue to promote GES' platform—equipment acquisition, optimization and disposition—to customers worldwide.
"Roger's 20+ years of technological experience in the equipment leasing and finance industries, coupled with being one of the founders of creating the platform for managing the lifecycle of semiconductor equipment, truly makes him the most appropriate person to continue growing GES on a global scale," said Paul Bossidy, CEO of GE Commercial Finance, Commercial Equipment Financing.
Innes was cofounder and president of Comdisco Electronics, whose portfolio was acquired by GE in April 2002. Prior to joining GES, Innes served in various leadership positions in both sales and general management with Comdisco, GE Capital and Equitable Life Leasing companies.
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