Fake MOSFET?

[Nogtail]

I recently got some components from eBay and most of them have turned out to work fine. I have had problems with some of the MOSFETs however, with shorts between the source and drain and them not being able to handle even a few amps.

I went a bit medieval on some of the dead ones and a (dead) genuine IPD50N03S2-07 (marked PN0307) for comparison. The dies inside the eBay MOSFETs are tiny in comparison to the genuine PN0307, even when specs look similar. Have I been sold fakes, or is this some fancy new small process?

[wraper]

ebay is full of fakes. Actually many of the parts which are easy to counterfeit are nearly impossible to buy genuine.

[radar_macgyver]

Rod Elliott's take: http://sound.whsites.net/counterfeit.htm

Power devices seem particular favorites of these criminals.

[all_repair]

They are fake.  File for claim and leave a negative feedback.  Do not be guided by the seller even he has 99.98% good rating.  I gave the benefits of doubts to polita (can't remember the exact ID now) many years back.  Lost 100USD, sent back and they claimed non-receipt and I missed the feedback window.  Ebay and paypal walked out on me.
The best thing that happened was now I buy direct from China.