Incoming Inspection and Rescreening of Semiconductor Lots
Buying a part to a high-reliability specification does not guarantee the part received meets it. Willoughby's Navy studies found no discernible difference between military and commercially screened semiconductors across twelve part types, ten to seventeen percent rejection when supposedly screened lots were re-tested, and a major supplier shipping unburned-in parts for years — which is why the Navy rescreened incoming semiconductors itself rather than trusting the paperwork.
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Buying a part to a high-reliability specification does not guarantee the part received meets it. Willoughby's Navy studies found no discernible difference between military and commercially screened semiconductors across twelve part types, ten to seventeen percent rejection when supposedly screened lots were re-tested, and a major supplier shipping unburned-in parts for years — which is why the Navy rescreened incoming semiconductors itself rather than trusting the paperwork.
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