Fairchild R460PF2: Fake or not Fake ?

[Nounours18200]

Hi,

I have received the following FAIRCHILD diodes that I suspect to be Fakes for 3 reasons:

-the font uwritten on the case is not the same than usual, althought the Fairchild logo is the same
-the finish of the legs is not as good as usual
-the case itself has not the same finish than usual​

but it has been bought for a known internaional dealer (UtSource.com).

I have attached a photo of the diode:


How to know if it is a fake ?
Thanks

 

[MAAC0]

Put some serious power through them and let them smoke.

 

[nigelwright7557]

I bought a irfp9240 off ebay saying it was Vishay part.
The amp powered up ok.
When I unplugged my soldering the part blew up.
My amp power supply is only 45 volts and these parts should stand 200 volts.
I can only guess the spike on the mains got into my power supply and the device broke down.

I replaced it with an RS Components part and despite trying very hard to blow it up with mains spikes it refuses to die.

So no more ebay or Asian parts, its RS and/or Farnell for me.

 

[wg_ski]

Put some serious power through them and let them smoke.

Maybe not serious power per se, but give it 100kHz to rectify at a moderate current. If it's fake it will get blistering hot really fast. They may have used a chip that can handle several amps, but I doubt it's as fast as it's supposed to be (if it's a fake).