Conformity Magazine - December 2008 - (Page 21)

Component suppliers have struggled to determine how to meet their customer’s requirements without the guidance of a standard, resulting in inconsistency between suppliers. Only recently have standards bodies responded. For example, IEC has issued a test method limited to CAN bus transceivers, used in the automotive industry, IEC 62228. [10] In addition, ESDA working group 5.6 is now working on a more general test procedure which should be available for industry review within the next year. This new test method has been named human metal model, (HMM). This is because the original IEC 61000-4-2 current waveform is intended to simulate a charged person, holding a metal object such as a screwdriver or key, discharging to a grounded object. Discharge from the metal object produces the initial current spike, while the remainder of the waveform is the discharge of the person. Summary In the next few years, the electronics industry will become increasingly aware that advanced integrated circuits can be reliably handled at lower ESD passing voltages for HBM, and with revised targets for CDM. The increased care in handling of these advanced products will be more than made up for by lower costs due to fewer redesigns, improved time to market, and higher performance products. The MM will slowly fade from use, but will not disappear for several years, if ever. A generally accepted CDE test will be available for system testing. This test will replace the proprietary tests used by several companies. Claims that components can pass the IEC 61000-4-2 system-level test will be replaced with better defined specifications based on IEC 62228 for the CAN bus, or a more general HMM specification from the ESDA working group 5.6. Robert Ashton is a senior protection and compliance specialist at ON Semiconductor, and can be reached at Robert.Ashton@onsemi.com. References 1. Industry Council on ESD Target Levels, “White Paper 1: A Case for Lowering Component Level HBM/MM ESD Specifications and Requirements,” August 2007, www.esdtargets.blogspot.com. Robert Ashton, “Human Body Model, The Hidden Challenges,” Conformity, June 2008, p. 32. R. Gaertner, R. Aburano(1), T. Brodbeck, H. Gossner, J. Schaafhausen, W. Stadler, F. Zaengl, “Partitioned HBM Test - A New Method To Perform HBM Tests On Complex Devices,” EOS/ESD Symposium 2005, p. 178. Robert Ashton, “Field- Induced Charged Device Model: What Really Happens,” Conformity, March 2008, p. 34. 5. H. Wolf, H. Gieser, W. Stadler, and W. Wilkening, “Capacitively coupled Transmission Line Pulsing, CCTLP – A Traceable and Reproducible Stress Method in the CDM-Domain,” EOS/ESD Symposium Proceedings, September 2003. JESD47E “Stress Driven Qualification of Integrated Circuits,” January 2007. AEC-Q100-Rev-F “Stress Test Qualification of Integrated Circuits”, Automotive Electronics Council 2003. Robert Ashton, “System Level ESD Testing: The Waveforms,” Conformity, October 2007, p. 28. Robert Ashton, System level ESD Testing: The Test Setup,” Conformity, December 2007, p. 34. 6. 7. 8. 9. 10. IEC TS 62228, “Integrated circuits – EMC evaluation of CAN transceivers,” International Electrotechnical Commission, February 2007. FAST Link www.conformity.com/2430 2. 3. 4. DeCember 2008 Conformity 21 http://www.conformity.com/2430 http://www.esdtargets.blogspot.com http://www.kikusui.us http://www.kikusui.us

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Conformity Magazine - December 2008 Contents Editor's Note FCC Warns Regulatory Fee Payers About Potential "Phishing" Commission Prowls the Web to Enforce Its Regulations First DTV Rollout Initiated in Wilmington, NC New Standards List Released for the EU's Directive on the Safety of Toys ESD Association Call for Papers ESDA. JEDEC Announce Standards Development Cooperation Commission Releases Data on Local Telephone Competition The Future of ESD Testing ESD Open Forum Emerging Issues in Standards: China RoHS: One Year and Counting Challenges in Testing: Revisiting 10-Meter and 3-Meter Radiated Emission Measurements Design Fundamentals: Meeting the Shielding Challenges of Injection-Molded Plastics Focus On...Microwave Absorbers Buyer's Guide FDA Recalls Automated External Defibrillators FDA Revises Guidance on Medical Device Tracking Guidance Document Safety of Passive Implants Released FDA Offers Guidance on Marketing Diagnostic Ultrasound Systems EU Commission Issues Correction on Machinery Directive Standards Other CPSC Actions in the News Product Reviews IEC Standards Update UL Standards Update Looking Back: Items from Past Issues of Conformity Advertisers

Conformity Magazine - December 2008

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