Electronics > Repair

Need help repairing Miller welder Power board PN 230855B

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Symax:
I'm doing a repair for a friend in the hopes that he'll do some metal work for me in the future.  I'm trying to find the data sheet for 25N12LL from Sirectifier so I can find a replacement part.  I'm guessing the 25 in the component part number means 25 amps for an N pole transistor.  I'm not sure what the 12 or the LL part mean so that I can find the equivalent replacement.

BrokenYugo:
Maybe a 25N120 IGBT?

Symax:

--- Quote from: BrokenYugo on June 16, 2021, 04:29:07 am ---Maybe a 25N120 IGBT?

--- End quote ---

And that is the thing.  I'm wondering if it is 120V or 1200V.  Having the specs from the original part would shed some light on that.

mindcrime:
Looking at Sirectifier's website, and looking at apparent patterns in their product listings and part numbers, I'd go out on a limb and bet that the 12 means "1200V". Would I bet my life on it? Hmmm... not sure. But a few dollars anyway.

Maybe try contacting the company? sales@sirectifier.com shows up on the website. Who knows, maybe you get lucky and get somebody friendly on the first try and they give you the exact info you need? I mean... that's gotta happen every once in a while, right?

BrokenYugo:
If the manufacturer is still in business it certainly doesn't hurt to ask.

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