Quote:
Originally Posted by kalee20
....which are in a different package (DO35) than ordered and certified (DO7). .
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Often a clue to a fake is a non standard or different package. One major methodology for fakers is simple parts substitution and re-label (most fakers wouldn't be able to make a semiconductor device themselves even if you gave them a block of Galena and a cats whisker and a Dymo label machine)
One good one I saw recently was a mosfet with a higher RDSon than the original part. The fakers didn't know that in the circuit is was in, it had little heat sinking because the design always had it off or fully enhanced carrying 20A. So the fake part melted, but probably in other circuits they would have gotten away with it.
This is how they get away with it a lot of the time of course, they are aided by the good Engineers who build with conservative design rules and the parts slip through unnoticed and appear to work ok.