Electronics > Repair

Real or fake IGBT FGL40N120?

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masterx81:
I've choose the NGT as seemed more similar than the ATP... It was the primary parameter. Hope that they work... Space is not a problem, also the fixture of the heatsink is not a problem.

Now, i have a 120v 30a 300w dc load, i can generate any voltage with a variac, scope, etc, what tests (maybe, non destructive  :-DD)  i can try on them to see if they are something good?

suntime:
Hi,

Original here:
https://www.lcsc.com/product-detail/IGBT-Transistors-Modules_onsemi-FGL40N120ANDTU_C11754.html

masterx81:
Hi! How i can know that they are genuine parts? Also the one bought on ebay had the description "Original"  :palm:

Phil1977:
A "semi-destructive" test would be to check the thermal resistance from the junction to the backplate.

Mount the device to a decent heat sink and drive it to the power dissipation of the absolute max ratings. If it´s original it will survive this test, if it´s fake then chances are good it destroys itself.

Unfortunately it´s quite hard to access T_junction of an IGBT by measuring some temperature dependent characteristic. For bipolar transistors or diodes you can just measure the forward voltage, but AFAIK most IGBT parameters are not so well related to T_j .

masterx81:

--- Quote from: Phil1977 on August 30, 2024, 07:23:20 pm ---A "semi-destructive" test would be to check the thermal resistance from the junction to the backplate.

Mount the device to a decent heat sink and drive it to the power dissipation of the absolute max ratings. If it´s original it will survive this test, if it´s fake then chances are good it destroys itself.

Unfortunately it´s quite hard to access T_junction of an IGBT by measuring some temperature dependent characteristic. For bipolar transistors or diodes you can just measure the forward voltage, but AFAIK most IGBT parameters are not so well related to T_j .

--- End quote ---
It's rated 200w at 100*C, i can preheat the whole heat sink, and push 100Vdc at 20A. I think that i can leave it in this state only for few seconds... And eventually be prepared to some nice fireworks  :-DD

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