who can help me with this ?

Discussion in 'General Electronics Chat' started by jessietechele, Nov 28, 2013.

  1. jessietechele

    Thread Starter New Member

    Jul 23, 2013
    5
    1
    I have a problem, need help from you guys,
    Rotation diode ZX300A, If the it is at 20 degrees centigrade and receives a current of 300 amps its temperature will rise if it is not cooled.

    My question is how many seconds will need to arrive at maximum allowed temperature if diode has no external cooling?

    Thanks in advance!:)
     
  2. ScottWang

    Moderator

    Aug 23, 2012
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    I think you should asking for help from the manufacturer in Tianjin.
     
  3. #12

    Expert

    Nov 30, 2010
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    I made a serious effort to find the data by searching the internet, but failed. The next step more likely to get results is the manufacturer (as ScottWang said).
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Last edited: Nov 29, 2013
  5. WBahn

    Moderator

    Mar 31, 2012
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    In order to know how long it will take, you need to know the thermal mass of the diode. Even then, the diode is going not going to heat evenly nor are the different parts of it going to be equally sensitive to that heat.

    So your best bet, as others have already pointed out, is to contact the manufacturer and tell them exactly what you are trying to accomplish, at least as far the diode is concerned.
     
  6. #12

    Expert

    Nov 30, 2010
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    If the almost unreadable chart says, "theta JA, that's the final temperature equilibrium in free air, but the question is, "How much time".
    I am also confused about the idea that the part is expected to arrive at maximum allowed temperature (150 C) but there is no explanation about how it will be deprived of the cooling effect of free air flow.
     
  7. WBahn

    Moderator

    Mar 31, 2012
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    I think that "has no external cooling" probably just means that there is no forced air cooling or heatsink. Of course, it could be that it is going to be mounted in a manner than doesn't allow much heat to be carried off, but we would need a lot more specific info from the OP.
     
  8. WBahn

    Moderator

    Mar 31, 2012
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    Do you have any of these diodes? Your best bet might be to simply instrument one or more of them and find out. They look like they are large enough to make doing this a fairly straightforward and inexpensive thing to do.
     
  9. ScottWang

    Moderator

    Aug 23, 2012
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    The op seems like that she was the employee of the agents of the manufacturer.

    The EE parts made in China is not easy to get the datasheets, so if you guys want to use that kinds of parts, you should make sure that you can get the datasheets before you want to buy or use them.
     
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