Most don't get published because there is not enough information or the claims made cannot be substantiated, but there is still good reason to be ever vigilant.
Over the years, I have had a bizarre variety of parts brought to my attention. In short, any component that is priced higher than another of similar shape and size is a possible target. Many polypropylene capacitors are in fact polyester, some 'non-inductive' resistors are just standard wirewound resistors re-marked, and even electrolytic capacitors have been faked (yes, that is completely true - I've seen one!). ICs - especially those with relatively high value - are potential (if not real) targets, and even mundane passive parts have been faked. It is a fight that we cannot win, but at least by knowing what to look for and where the problems have been found, there is at least some hope that we can make it harder for the criminals involved.Īlthough I have concentrated on power transistors, and especially those used for audio power amplifiers, counterfeit semiconductors exist in nearly all categories. Your continued vigilance will help the fight against these practices. I would like to thank those who have sent information, photos or links to other sites about fake devices. The devices described here must not be considered comprehensive, as I am sure that there are a great many additional counterfeit devices available that have either not been discovered yet, or whose purchasers are too embarrassed by being caught by the fraudsters, and are unwilling to admit that they were robbed.
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