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    Is this a diode?

    Is this a diode? Please see pics, identifier is RU4Y above a second line saying 1N, but I cannot identify. Can I use for a 1N5408? Thanks.
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    #2
    Re: Is this a diode?

    https://cdn.badcaps-static.com/pdfs/...112ddc643d.pdf

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      #3
      Re: Is this a diode?

      The RU4Y is a 2 amp 100volt fast recovery diode, The 1N5408 is a 3 amp 1000 volt standard diode
      The 1n5408 will likely not work in a switching power supply

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        #4
        Re: Is this a diode?

        2A diodes are not popular, hard to find in North America. I would use UF5402 3A 200V fast recovery.
        1N540x is very slow diode.

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          #5
          Re: Is this a diode?

          Standard recovery 1N540x would probably get toasted if a fast recovery type is necessary.

          On the other hand, a UF5402 is much faster than the original part, and might generate extra noise with its fast turn-on.

          A closer match would be an MR852. The MR850 series has been around a long time. As the part number suggests it was originally a Motorola part, among the many Mot sold to On Semi. I remember seeing MR85x parts in use as Boschert when I was there in the early 1980s.
          PeteS in CA

          Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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          To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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