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Original question:

TVS0500: Failure mode

TPD1E10B06: Failure mode

Takumi Suzuki1
Mastermind 8430 points
Part Number: TPD1E10B06

Hi

Let me ask you a question about "failure mode" of TPD1E10B06.

I asked you the same question the other day and I got the following answer then.

TVS0500: Failure mode - Interface forum - Interface - TI E2E support forums

 "It can be a short or an open failure. They can also degrade if the stress is slightly above the absolute maximum ratings."

 

Though the answer was "It can be Short or Open", I do not understand well about the answer.

Because the device maybe connected to "power line", in that case, "Short" conditioin is not good situation.

And that case (power line connected), failure condition of the device must be "Open", I suppose... 

I would like to ask your idea again about this.

Thank you for your support.

Best Regards,

Takumi

  • 0
    TI__Genius 13680 points

    Hi Takumi,

    I cannot gaurantee any specific type of device failure. Indeed a TVS diode failing short on a power line is not an ideal situation. A way to protect from this is to include a fuse on the power line before the TVS device. 

    A TVS diode that has failed short can also become open if it is conducting current for a certain period of time. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Mastermind 8430 points

    Hi Sebastian-san,

    Thank you very much for your answer !

    I undeerstood but let me ask you more detail as below.

    Can I assume that the probability of occurrence of a short and an open are about the same?

    Or do you think that most are open and very few is short mode?

    (Basically it is open mode, and in rare cases it may be short mode...)

    I appreciate your kind support.

    Regards,

    Takumi

  • 0 in reply to Sebastian Muriel
    Mastermind 8430 points

    Sebastian-san,

    >>A TVS diode that has failed short can also become open if it is conducting current for a certain period of time. 

    Do you have a data how long does it time to become open mode from short?

    A few mSec? or few seconds??

    Thanks!

    Takumi

  • 0 in reply to Takumi Suzuki1
    TI__Genius 13680 points

    Hi Takumi-san,

    In my experience TVS diodes tend to fail short more often but it shouldn't be assumed that is the most common failure mode. 

    Regarding the amount of time it would take a diode that failed short to become open, there is no way for me to predict how long this will take as it is dependent on the amount of current through the TVS, impedance at the input, and the thermal resistances of the diode. TVS diodes are designed to conduct transient events (nS -uS range), so the heat produced from the diode constantly conducting current (even a few mSec) can cause an open failure. 

    Regards,

    Sebastian