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Rectifier substiture?

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  • Rectifier substiture?

    I'm trying to find a substitute for an obsoleted rectifier, SF304 (see attached datasheet). Does this look like a good substitute?

    FFA60UP20DNTU

    https://www.mouser.com/ProductDetail...2Bnw0GaA%3D%3D

    Is there any reason the replace the other, opposite polarity rectifier in the circuit if it tests good?

    Thanks!
    Attached Files

  • #2
    I think you will need to provide info regarding the intended application (eg schematic with voltages) before anyone can have a chance of helping.
    My band:- http://www.youtube.com/user/RedwingBand

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    • #3
      I agree^^^

      But it looks like the specs are the same: ultra-fast, 30A, 200v.
      Education is what you're left with after you have forgotten what you have learned.

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      • #4
        It's close but the forward voltage drop is quite a bit higher. Therefore the power dissipation will be significantly higher too. That might not matter if the thermal margins are good.
        Experience is something you get, just after you really needed it.

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        • #5
          If you don’t have a schematic tell us what it’s in?

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          • #6
            Thanks everyone.

            It's for the Mackie FR M1400i I am working on in this thread:

            https://music-electronics-forum.com/...573#post537573

            The schematic is in that thread. I'm somewhat confident that I found at least part of the problem with this thing, but of course the rectifier is obsoleted. I figured the generic question regarding a substitute would see a bigger audience in this forum than the specific thread on the amp. The substitute I am asking about was what Mouser listed as similar, once I chose the same form factor, and other specs of the SF304.

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            • #7
              The problem is it takes a long time to research and compare parts. Per my comment above I suggest you find one with a lower forward voltage drop. I don't think the switching speed is crucial, although it may affect the noise level. Power dissipation is important. You might consider a schottky diode for speed and low drop.
              Experience is something you get, just after you really needed it.

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              • #8
                FWIW: The NTE6251 is a cross and is available.
                "I took a photo of my ohm meter... It didn't help." Enzo 8/20/22

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                • #9
                  Originally posted by The Dude View Post
                  FWIW: The NTE6251 is a cross and is available.

                  Excellent, thank you!

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