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TVS0701: Leakage current curve vs voltage

Carlo
Expert 7715 points
Part Number: TVS0701
Other Parts Discussed in Thread: TVS3300

Hi E2E,

Good day.

For the TVS0701, the leakage current is ~0.25 to 40nA (at room temp) at 7V, the Vrwm. What is the expected leakage current below Vrwm? Is there an IV curve that shows the relationship of leakage current curve vs voltage? or it is a purely ohmic/linear relationship?


Regards,
Carlo

  • 0
    TI__Genius 11196 points

    Hi Carlo,

    If you have a voltage below Vrwm, the leakage current will definitely be lower than if the voltage was equal to Vrwm. It's hard to say what exactly the leakage will be at a certain voltage below Vrwm, but the difference should be negligible. We don't have an IV curve for this device, but if you look at the TVS3300 (a higher voltage device in this same family), it will give you a good idea how this device will perform. 

    Please let me know if you need any clarification on this. 

    Regards,

    Matt Smith

  • 0
    Prodigy 20 points

    Hi Matt or anyone else,

    I'm the one who opened the query with Carlo.

    When you say "the difference is negligible" do you mean that the leakage current, while lower for a voltage < Vrwm, will not be significantly lower. I'm actually hoping to achieve pA leakage current, which is not common (or existent) in TVS diodes from my research. My hope was that if we have 200nA (max at 125 C) at 7V, then V=IR, R~=35MOhm, and at 1.25mV the leakage current should be about 35pA. I understand that its not really possible say exactly the behavior, but do the estimates I just wrote seem to match your teams best guess?

    In short, is it possible the leakage current would be in ~pA when biased at 1.25mV

    Thanks,

    Josh

  • 0 in reply to Joshua Burdine
    TI__Genius 11196 points

    Hi Josh,

    Thanks for the clarification on your question. Your reasoning sounds valid. The IV curve for these devices is more of a exponential curve than a linear curve. That means that the current could actually be lower than if the curve was linear. (refer to figure 1 here https://e2e.ti.com/blogs_/b/analogwire/posts/esd-fundamentals-part-5-reverse-working-voltage-breakdown-voltage-and-polarity-configuration )

    The other thing you need to consider with leakage current is slew rate. For this device, if you have a higher slew rate, your leakage will increase (refer to figure 6 on page 7 of the datasheet).

    Please let me know if this answers your question.

    Regards,

    Matt Smith 

  • 0 in reply to Matt Smith
    Prodigy 20 points

    Hi Matt,

    You totally answered my question, and I really appreciate the help.

    Fortunately, in the non-transient/nominal case, where I care about the leakage current, we will have mV fluctuation over ms scale, so slew rate is more or less negligible for my specific case. Thank you for brining it to my attention.

    Best Regards,

    Josh

  • 0 in reply to Joshua Burdine
    TI__Genius 11196 points

    Hi Josh,

    Happy to help! If you or Carlo, could click on the "Resolved" button, I can close out this thread.

    Regards,

    Matt