Siemens RVS21.831, Looking for References, Models, and Values of These Components

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  • mengpo
    New Member
    • Dec 2021
    • 9
    • France
    #1

    Siemens RVS21.831, Looking for References, Models, and Values of These Components

    Hi everyone,

    Following a short circuit on the controller board of my heat pump, I'm looking to replace the components shown in the photos. All I know is that they are diodes (but I'm not sure what type), and I haven't been able to find their equivalents.
    The one on the left says: 15A 5BA
    The one on the right says: DTZ S47 or DTZ 547
    Does anyone know how to identify them?

    Thank you very much for your help!

    FYI, the card is a siemens RVS21.831
    2 Photos
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8179
      • Canada
      #2
      What do this pins do? If I had to guess these are TVS diodes.

        Comment

        • redwire
          Badcaps Legend
          • Dec 2010
          • 3910
          • Canada
          #3
          A new diode will also just blow - you have to find out why mains is present at that low voltage connector!
          Logo is Vishay General Semiconductor - Diodes Division.
          Closest I can find is 5KASMC or maybe a 1.5SMC TVS.
          "5AG" is not listed but might be a 5KASMC8.5A
          see SMC markings

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8179
              • Canada
              #4
              Vishay marking 15A = 1.5SMC15A or a P6SMB15A; Vishay, Onemi or Littlefuse etc are the same.
              The other one I can't make out the manufacturer. Maybe clean it up and make another picture.

              A diode marking DT on a SMB device would be a SMBJ78CA.
              I guess you have to figure out if the case size is an SMB or a SMC and go from there.
              Last edited by CapLeaker; 02-23-2025, 04:08 PM.

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