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ELECTROSTATIC DISCHARGE FAILURE RATE PREDICTION

IP.com Disclosure Number: IPCOM000042776D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 3 page(s) / 49K

Publishing Venue

IBM

Related People

Davis, JH: AUTHOR [+2]

Abstract

An Electrostatic Discharge (ESD) Failure Rate Factor (FRF) is determined and used to predict a product's ESD field performance with greater accuracy than prior techniques. Customer dissatisfaction with a product can take many forms, including unsatisfactory ESD performance. It is, therefore, advantageous to be able to predict a product's ESD performance in a customer environment using a laboratory test procedure. Two methods now being used as a measure of a product's field performance are single voltage testing and initial fail point testing, both of which methods have deficiencies. Single voltage testing rates a product's performance using a single test voltage.

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ELECTROSTATIC DISCHARGE FAILURE RATE PREDICTION

An Electrostatic Discharge (ESD) Failure Rate Factor (FRF) is determined and used to predict a product's ESD field performance with greater accuracy than prior techniques. Customer dissatisfaction with a product can take many forms, including unsatisfactory ESD performance. It is, therefore, advantageous to be able to predict a product's ESD performance in a customer environment using a laboratory test procedure. Two methods now being used as a measure of a product's field performance are single voltage testing and initial fail point testing, both of which methods have deficiencies. Single voltage testing rates a product's performance using a single test voltage. The assumption is that the product's performance at other voltage levels is known from the results at a single voltage even though ESD events occur in field usage over a wide range of voltages. Initial fail point testing rates a product's performance using a large number of ESD events to determine the lowest voltage at which a product fails. This method of testing also assumes that the product's performance is known from the results at a single voltage. The FRF characterization of a product's ESD performance is a figure of merit in which performance is measured by the number of ESD pulses necessary to produce an error requiring customer intervention. This number can vary from one error per ESD event to one error per many ESD events. The ESD performance of three hypothetical products is shown in Fig. 1. A product which lies along curve 1 will have a high field failure rate compared with a product lying along curve 3, which is relatively immune to failures. A product with performance along curve 2 will have a field performance between the products represented by curves 1 and 3. In an article by R. B. Simonic, entitled "Electrostatic Furniture Discharge Event Rates for Metallic- Covered, Floor-Standing Information Processing Machines," IEEE International Symposium on Electromagnetic Compatibility, Santa Clara, California, September 8-10, 1982, pages 191-98, the relationship between ESD events and voltage range has been shown. A figure in that article shows field data plotted as the number of ESD events versus ESD voltages at which these events occur. Thus, the environment of the product is depicted. On a vertical axis is plotted the number of ESD events occurring during an 8-hour shift, while the horizont...