Electronics > Repair

Real or fake IGBT FGL40N120?

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masterx81:
Hi!
I'm repairing an UPS (bought used quite cheap as functioning, but with all igbt shorted and some other mess around, i doubt that it was working), and i'm having fun finding all the components needed, trying to avoid counterfait parts...
How i can test an IGBT for know if it's genuine?


Left is original, right the new one. The package seem consistent, but the markings are a bit different.
The dca75 tells me:
Vge(on)=4.569v at Ic=5.04mA and Ig=3uA
Vge(off)=3.628v at Ic=5.1uA
gfe=29.9mA/V at Ic=3.0mA to 5.0mA
Vcesat=0.526V at Ic=5.0mA and Vge=8.0V with 0.52Vf body diode
From what i can tell, the few parameters that i can match on the pdf seem spot on, but the DCA75 test at way too little current...
I not have a good old IGBT for measure the parameters, all were shorted or exploded.
There are some tests that i can try to see if it's genuine? I've a 30A electric load, a signal generator, oscilloscope, etc.....
Thanks!

ArdWar:
Looking at visuals alone both aren't convincing tbf. Both logos are in the wrong proportions compared to official Fairchild marking, unless there were batches where laser bloom was normal.

BrokenYugo:
Who/where did they come from?

All power transistors from questionable sources can be assumed fake, buy from trusted suppliers, Digikey, Mouser, etc. if you want a trustable product. Not eBay, Amazon, Chinese marketplace sites, etc. half those sellers don't even know what they're selling.

Try scratching the gloss black in the middle, if it's painted it's definitely fake.

If you insist on testing I guess mapping out the whole safe operating area per datasheet and see if one blows where it shouldn't would be fairly definitive, or decap one and compare to real, fakes will have smaller/different die.

T3sl4co1l:
Right one is most likely bogus: notice the checkerboard finish on most of the surface (milled or lasered away), lack of mold mark (it's been ground down), and take a close look at the relief around the marking areas (is it painted or polished, or molded in?).  Leads look straightened.  Way too many scratches on the plating.  Not sure if they're successfully remaking matte tin plating these days but at least it's not hot-dipped.



--- Quote from: BrokenYugo on August 30, 2024, 02:11:09 pm ---All power transistors from questionable sources can be assumed fake

--- End quote ---

All components---FTFY.  I doubt it's even unique to semiconductors, there's just a little less value in commodity chip or leaded components and without as much marking (logo, date code, etc.) we don't notice.  You can't really clone a resistor with it still being apparently a resistor, but you can play the same sourcing shenanigans that affect semiconductors -- if there's no traceable path or accountability back to the supplier(s) and manufacturer, assume that break in trust has been abused.

Tim

masterx81:
They are from ebay... i can't find them on relaible sources as seem a discontinued part.
Good test the one on the clear part. On the original device, the clear part is a bit under the level of the surface, while on the new part is a bit higher. And yes, if i scrape, the clear part came away...
Not good...
There are out there some versions already with the onsemi logo... But always from not reliable sources.
There are on the market more counterfait parts than original :(

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