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COVER STORY


FEAT


ATURE


If the stuck-at condition above is not tested, then fault coverage is 98.96 per cent. Is this acceptable in your critical application? Semiconductor test is an intangible process – easy to conceptually understand – difficult to technically implement.


Effective test requires high fault coverage and accurate fault modeling. AS6171 calls out far greater testing for parts bought through Independent Distribution and yet is rarely followed.


The only way to offer a 100 per cent guarantee that a device operates to its specification, is to test it using the original component manufacturer’s (OCM) test processes. However, even the most basic MCU test, as carried out by the OCM, comprises many 100,000’s of man-hours in development. Third-Party Test Houses cannot hope to replicate these complex test processes, often only partial electrical and/or functional testing is carried out. The following table referencing standards shows very clearly the only risk-free solution is fully authorised:


The ultimate tool in the fight against Counterfeit is AUTHORISATION.


AUTHORISED After-Market Suppliers and Manufacturers (as called out in the US-DoD DFARS), such as Rochester Electronics, provide the only 100 per cent guaranteed and count


ors.


Finished devices stored and supplied by authorised sources are guaranteed to come only from the OCM and to have been stored in-line wit h the OCM’s recommendations. These products offer a 100 per cent conformance guarantee.


As a licensed manufacturer, Rochester Electronics are also able to offer ongoing production of obsolete devices. Built from known-good-die, these products are tested using the OCM test procedures and, in many cases, the original test equipment – Guaranteed 100 per cent compliant to the original specification.


Rochester Electronics is authorised by the OCM to mark their products with the original part number and the current date-code. Many of these devices are still in production 20 years after t he original discontinuation.


Rochester Electronics www.rocelec.com


/ ELECTRONICS


ELECTRONICS


| MAY 2020


35


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