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20 SMT Magazine • July 2017 by Martin Goetz and Ramesh Varma NORTHROP GRUMMAN CORP. Abstract Counterfeit electronic components are find- ing their way into today's defense electronics. The problem gets even more complex when procuring DMS (diminishing manufacturing source) parts. This paper will provide a brief in- troduction to counterfeit prevention and detec- tion standards, particularly as they relate to the aerospace and defense sector. An analysis of in- dustry information on the types and nature of counterfeit components will be discussed to il- lustrate those most likely to be counterfeited, followed by a specific case at a major defense contractor. The case involved two circuit card assem- blies failing at test, whereby their root cause for failure was identified as "unable to write spe- cific addresses at system speeds." The error was traced to a 4MB SRAM received from an ap- proved supplier. Fifteen other suspect parts were compared with one authentic part directly pur- chased from a supplier approved by the part manufacturer. Defects or anomalies were iden- tified but not enough to unequivocally reject these parts as counterfeit as the defects could have also happened in the pre-tinning process, which is a program-specific requirement if the parts were stored for more than three years. Through the subsequent analysis, subtle differ- ences between the authentic and suspect parts were identified and isolated. The methodolo- gies and process chosen to identify counterfeit parts will be reviewed and an assessment of the results will be presented along with the defects found in relation to the defect types reported in relevant test standards. Introduction The Defense Federal Acquisition Regula- tions DFARS 252.246-7007 Contractor Coun- terfeit Electronic Part Detection and Avoidance System defines a counterfeit part as: An unlawful or unauthorized reproduction, substitution, or alteration that has been knowing- ly mismarked, misidentified, or otherwise misrep- resented to be an authentic, unmodified electronic part from the original manufacturer, or a source with the express written authority of the original Counterfeit Electronic Components Identification: A Case Study FEATURE

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