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ISO124: What are the failure modes of ISO124?

user682868
Prodigy 50 points
Part Number: ISO124
Other Parts Discussed in Thread: ISO224

What are the failure modes of ISO124? Will the frequency or amplitude of the isolated signal be changed after the fault?
  • 0
    TI__Guru 55342 points
    Hello,

    Thanks for your post and welcome to the forum!

    The ISO124 is an old device and unfortunately a lot of the knowledge around it has been lost over the years. To the best of my knowledge there is not a dedicated failure mode for the ISO124.

    The ISO124 can fail in the following ways:
    1. Excessive voltage transients on the power supplies on either the input or output side.
    2. Input signal voltage that exceeds the power supply voltages (positive or negative).
    3. Excessive voltage across the isolation barrier.

    Any of these situations can lead to permanent damage to the ISO124 which could result in an erroneous output or no output at all, meaning that the device is dead.
  • 0 in reply to Alexander Smith
    Prodigy 50 points

    Thank you for your answer.
    The device is currently used in the railway signal field. I am worried that the ISO124 fault will cause the amplitude or frequency of the isolated signal to change, which is dangerous. If the ISO124 has no output after the fault, it is safe.
    So, what might be the "erroneous output" you mentioned?
    Also, what is the perfect replacement for the ISO124 device in TI's devices?
    Thanks again!

  • 0 in reply to user682868
    TI__Guru 55342 points
    You are most welcome.

    I apologize for misleading you. I merely meant to say that if the system is damaged (trace vaporizing, capacitor failure, arcing) then the system could behave differently or not at all, I should not have called out the ISO124 specifically. I have no records of the ISO124 output frequency or amplitude changing after a fault. If the device is subjected to a long lasting fault I would expect it to have no output.

    The ISO224 is the perfect replacement! It is currently in the preview stage, but it will fully release soon.
  • 0 in reply to Alexander Smith
    Prodigy 50 points
    Ok, thank you for your answer, thank you very much!