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Thread: Rectifier substiture?

  1. #1
    Member stoneattic's Avatar
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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 Attached Files

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    I think you will need to provide info regarding the intended application (eg schematic with voltages) before anyone can have a chance of helping.

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    Lifetime Member Enzo's Avatar
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    I agree^^^

    But it looks like the specs are the same: ultra-fast, 30A, 200v.

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    "Thermionic Apocalypse" -JT nickb's Avatar
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    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.

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    Old Timer olddawg's Avatar
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    If you donít have a schematic tell us what itís in?

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    Member stoneattic's Avatar
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    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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    "Thermionic Apocalypse" -JT nickb's Avatar
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    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.

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    Supporting Member The Dude's Avatar
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    FWIW: The NTE6251 is a cross and is available.

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    Member stoneattic's Avatar
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    Quote Originally Posted by The Dude View Post
    FWIW: The NTE6251 is a cross and is available.

    Excellent, thank you!

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