Electronics > Repair

Real or fake IGBT FGL40N120?

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ArdWar:
Oh so the left one is indeed just laser bloom I guess


--- Quote from: T3sl4co1l on August 31, 2024, 01:53:11 am ---It seems to me, a lot of older parts either remain in stock, or even production, in foreign markets.

--- End quote ---
For those in Asian countries you'll quickly get used to it. New stocks of old parts that somehow continue to exist way past a NOS supply would realistically provide. It's usually prevalent in repair or word-of-mouth hobbyist (eg. audio) communities.
Otherwise when would you realistically find the last Toshiba TO3 2N3055/MJ2955, or ST TDA2030, or Philips brand CRT TV driver. Some of those stopped production two decades ago.

suntime:
Hi,

I have ordered many components from LCSC and have never had any problems.
The image of the components that you see on their website and that are taken by them is what is sent to customers.

Regards.

Haenk:
After googling around for a bit, I can only assume that these are "real" ones. However likely in used condition, sanded down, coated and relabeled. The used parts likely came with long legs, easy to cut away to an unsuspecting "unused" length. The rasterized surface you see is from an UV printer. Why? They can charge more for "new" parts than for used parts - even if it is only a Dollar, that adds up...
So likely fine for a repair job.

wraper:

--- Quote from: Haenk on August 31, 2024, 01:47:46 pm ---After googling around for a bit, I can only assume that these are "real" ones. However likely in used condition, sanded down, coated and relabeled. The used parts likely came with long legs, easy to cut away to an unsuspecting "unused" length. The rasterized surface you see is from an UV printer. Why? They can charge more for "new" parts than for used parts - even if it is only a Dollar, that adds up...
So likely fine for a repair job.

--- End quote ---
I don't get how you came to the conclusion it should be the same part. Nothing prevents them relabeling a different component with worse ratings that may even work on a first glance.

masterx81:
The legs are normally long (as a new device), and not seem welded.
Before the power test, i've tried a thing bought time ago on Aliexpress. The scary 3.5kv breakdown tester. Never used before. I've tried it at minimum current, and top at around 1280v. At least the voltage rating seem spot on, but i not think that the device is happy  :scared:
Tried also with the LCR the gate-emitter capacitance, and is 3.9nf at any frequency (up to 100khz), but the test on pdf is taken at Vce=30v, Vge=0v and at 1mhz, so i not know how can be compared. In any case isn't too much distant from the 3200pf on the pdf...
I was thinking that the on delay time can be measured quite accurately. I have a 200mhz scope (siglent 1204 x-e), somewhere i have something that can output a pretty sharp square wave... The original part have a specified 15ns Td(on), but with 600vcc, 40A, Rg=5ohm, Vge=15v, inductive load at 25*c. The problem is how recreate this conditions...

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