Circuits Assembly Online Magazine - Products

News

The International Reliability Physics Symposium (IRPS) has announced that Dr. Hans Stork, chief technology officer of Texas Instruments, will be the keynote speaker at IRPS 2004. The 42nd annual symposium for the scientific exploration of microelectronic reliability will take place April 25-29, at the Hyatt Regency Phoenix at Civic Plaza, Phoenix, AZ.

Dr. Stork, who was recently named CTO after serving as senior vice president of Silicon Technology Development at TI, will discuss "Reliability Challenges of sub 100nm-CMOS SoC."

Other highlights of the symposium will include technical sessions featuring the largest number of papers submitted and accepted in IRPS history. The two day tutorial series on reliability engineering for upcoming professionals features sessions on Future CMOS, Gate Dilelectrics, Low K/Cu Interconnects, RF/MMIC Reliability, Failure Analysis, General Reliability, Design Practices, ESD, High K Dielectric, NBTI and SER. The conference will also feature a poster session, a half-day Reliability-Year-In-Review seminar and a technically oriented, hands-on exhibit that will allow attendees to test and evaluate state of the art reliability analysis equipment.

The three-day technical program kicks off with Novel Transistor Reliability Findings, followed by sessions on transistors, back-end integration, gate dielectrics (SIO2 and High-K), latchup, products and circuits, memory, interconnects, MEMS, SER/SEU,ESD, back-end dielectrics and failure analysis.

Dr. Stork joined TI in 2001 from Hewlett-Packard, where he served as director of the Internet systems and storage lab at HP Laboratories, and earlier as the director of the ULSI research lab.

Dr. Stork has written or co-authored approximately 90 papers and holds five patents. He was elected IEEE Fellow in 1994 for his contributions to SiGe devices and technology and is also a fellow member of the IEEE Electron Devices Society, where he has served on and chaired a number of committees.

Dr. Stork joined the Sematech board of directors in 2002 after serving for several years on the organization's executive technical advisory board. He also has been a board member of the Semiconductor Research Corp. since 1999 and serves on the Semiconductor Industry Association's (SIA) technology strategy committee. Additionally, he served as a technical advisor to government efforts on high-performance computing benchmarks and the national security issues emerging from Internet computing.

www.irps.org

During the run-up to the change to lead-free solders by July 2006, a number of end users have expressed concerns about the reliability of soldered joints formed by mixtures of tin/lead (SnPb) and lead-free materials. These will arise when lead-free components are soldered using SnPb alloys, something already happening in many production lines, and later when SnPb components are soldered with lead-free alloys. The latter issue may be a significant problem for companies that have had to invest in lifetime purchase of components. Several workers have already published information that suggests that small levels of lead contamination in lead-free joints can significantly reduce joint performance.

Many of those concerned end-users approached National Physical Laboratory (NPL, Teddington, UK) to assist with clarification of any reliability issues during the transition period. A consortium of 16 contributing companies was formed with a work program. The work will cover reliability assessment of lead-free joints to SnPb components; reliability assessment of SnPb joints to lead-free components; evaluation of hot-peel strength of lead-contaminated lead-free joints; and applicability of lead indicator kits for paints for recognition of lead-containing components

The work, lead by Martin Wickham, is underway and results are expected in the next 12 months.

Participating partners include:

Aeroflex International Ltd.
AMS Space UK
BAE SYSTEMS (Operations) Ltd.
Celestica Ltd.
Department of Trade & Industry
Dolby Laboratories Inc.
Eurotherm Ltd.
Goodrich Engine Control Systems
Hansatech Group
National Physical Laboratory
Robert Bosch GmbH
Rolls Royce Naval Marine
TRW Automotive
Thales Missile Electronics Ltd.

For more information please contact Dr. Chris Hunt: +44(0)20 8943 7027; email: chris.hunt@npl.co.uk.

www.npl.co.uk

Concoat Ltd. (Fleet, UK) has engineered a water-based conformal coating addition to its Humiseal range that can protect electronics assemblies at temperature extremes beyond the capabilities of existing resin-based alternatives. The performance characteristics of Humiseal 1H20 stem from a new water-based chemical formulation that was engineered by Concoat and took over a year of research and development to produce.

"1H20 is currently undergoing qualification testing between -65°C and +185°C," said Concoat's technical director, David Greenman. "Because the top end figure is at least 50°C higher than conventional resin materials, this product will be especially relevant to the automotive industry where upper performance limits are ideally rated at 180°C for engine bay electronics."

As water-based coatings, the series is also environment-friendly to meet with the drive in Europe to reduce volatile organic compounds (VOCs).

Concoat's chief chemist Phil Kinner, said, "The coating is both safe and easy-to-use, it has a superior 8kV breakdown voltage that is higher than conventional resin, it is extremely flexible and offers excellent chemical and mar resistance, and is repairable. And by being non-hazardous and low odor, it greatly reduces the demands on fume extraction equipment."

Managing director Graham Naisbitt said, "It also meets the growing demand for higher performance conformal coating materials capable of protecting modern printed circuit boards (PCBs) that exploit ever greater packaging densities allied with reduced conductor widths and spacings that are now being used in increasingly hostile operating environments."

1H20 AR7 Par 2 is qualified to MIL-I-46058C and IPC CC-830B. UR3 meets requirements for IPC-CC-830B and UR4 MIL-I and CC-830-B are pending.

www.concoat.co.uk

The Surface Mount Technology Association (SMTA, Minneapolis, MN) Medical Electronics Symposium will take place May 19-20 at the Marriott Minneapolis Airport Hotel in Bloomington, MN. It will explore devices, components, packaging and assembly technologies. The conference chairman is Jeff Kennedy, Manufacturers' Services Ltd., and technical sessions include design/reliability, manufacturing techniques and requirements, process and quality control, packaging, sensors/microelectromechanical systems (MEMS) and business/regulations.

Also featured during the program will be a Plenary Session, NEMI Medical Sector Roadmap, presented by Terry Dishongh of Intel Corp. A keynote presentation will be given by J. Doug Field, vice president of product development and chief engineer for Segway Co., which is known for the world's first self-balancing, electric powered personal transporter.

A second Plenary Session on Medical Product Outsourcing and Technology Trends will be presented by Keith Robinson, Frost & Sullivan, and a concluding roundtable discussion will focus on trends and challenges associated with bringing new products to market and working with multiple partners in a complex supply chain. The panel will expose barriers to entry of service to the medical sector and the unique challenges associated with supporting the medical products manufacturing process.

www.smta.org/education/symposia/symposia.cfm

The IPC Association (Northbrook, IL) recently commended DEK's (Zurich, Switzerland) technological advances with its new via fill process. Awarded a slot in the Innovative Technology Showcase at the APEX exhibition in Anaheim, CA, DEK's 100% fill technology was described by the judges as groundbreaking.

As part of the new and emerging technologies showcase, the process delivers 100% fill of substrate vias with no voids and minimal surface residue. This Pro-Flow-based process offers solutions to problems such as insufficient fill, voiding, poor throughput and excessive handling of product.

The fully enclosed head is used in conjunction with a dedicated tooling fixture that ensures complete fill of vias in the minimum of print passes (typically two), with a paste pressure of 2.5 bar and a print speed of 25mm/s. In addition, the print material has been shown to have a life of over three months in the transfer head.

Traditional manual or squeegee-based systems are less clean and operator-friendly, and take multiple passes to push material into vias. They can also use a vacuum table to pull material through, resulting in both voids and inadequate deposition.

With results in throughput of over fives times faster than traditional squeegee-based fill processes, the system is repeatable and offers accuracy.

DEK is a global provider of advanced pre-placement manufacturing solutions and innovative deposition technologies for a wide range of electronic materials.

www.dek.com

In a move to help customers speed time to market and reduce manufacturing costs, Dow Corning Corp. (Midland, MI) has launched the External Equipment Provider Alliance with nine companies from the electronics assembly and packaging industry. Under the new alliance—the first of its kind in this market—Dow Corning will work with member companies and customers to streamline the integration of materials and equipment used in board-level assembly and back-end packaging, resulting in standard equipment or customized solutions that help customers meet production goals more quickly and efficiently.

The network of member companies includes Asymtek (A Nordson Company), Bartec Dispensing Technology, DEK, Fluid Research Corp., Lambda Technologies, Liquid Control Corp., Precision Valve & Automation (PVA), Scheugenpflug AG and Sieghard Schiller GmbH & Co. KG. As providers of meter-mix, conformal coating, fluid delivery, rapid curing, stencil printing and robotic xyz positioning, these companies have all demonstrated expertise in applying and handling Dow Corning's silicone and organic materials.

Under the alliance, Dow Corning will leverage member companies' expertise to simplify the procurement, integration, start-up and optimization of materials and processing equipment. By working together, alliance members can help customers address any number of challenges—from choosing the right combination of equipment and materials for a new process to delivering turnkey production packages. The alliance will also provide a lead contact who will work directly with the customer, coordinating the alliance's resources to develop business solutions.

Tom Cook, Global Industry Executive Director, Electronics & Advanced Technologies Industries, Dow Corning, said, "Dow Corning will partner with customers to provide as little or as much assistance as they need, helping them achieve day-to-day objectives as well as key, long-term business goals. The beauty of an alliance like this is that it gives customers access to more resources than any single supplier could deliver alone."

The company has been organizing the alliance over the past year and has selected members based on its long-term relationships with these and other companies throughout the board-level assembly and back-end packaging industry. Dow Corning plans to expand the alliance to other electronics market segments, such as wafer-level and front-end packaging.

www.dowcorning.com/electronics