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ESD204: Max Junction Temperature of ESD204 4-Channel Low-Capacitance Surge and ESD Protection Diode

Giselle Ventura
Prodigy 40 points
Part Number: ESD204

Tool/software:

Hello, 

What is the max junction temperature of ESD204 4-Channel Low-Capacitance Surge and ESD Protection Diode? I am given operating and ambient but I'm not max junction temperature which I need for a risk analysis. 

Thank you,

Giselle

  • 0
    TI__Expert 5290 points

    Hi Giselle,

    From my understanding, the maximum junction temperature is the maximum operating temperature, which would be 125°C.

    Please let me know if you have any additional questions!

    Best Regards,

    Josh Prushing

  • 0 in reply to Josh Prushing
    Prodigy 40 points

    This is unexpected, max junction temperatures are typically much higher than the operating temperature. Is this typical of this type of diode?

  • +1 in reply to Giselle Ventura
    TI__Expert 5290 points

    Hi Giselle,

    Apologies, I mis-took max junction temperature for another specification.

    As I have stated in a previous post, max Junction temperature can be calculated using a formula (TJ = TA + RθJA * PDEV). 

    Please let me know if you have any additional questions!

    Best Regards,

    Josh Prushing

  • 0 in reply to Giselle Ventura
    TI__Expert 5290 points

    No problem Giselle! Apologies for the initial confusion.

    Please let me know if there is anything else I can assist you with Slight smile

    Best Regards,

    Josh Prushing

  • 0 in reply to Josh Prushing
    Prodigy 40 points

    Actually, I do have a follow up question, if I want to know the absolute max junction temperature the diode can undergo without breaking, my Ta should be 125C, is that correct?

    In the calculaiton https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1335859/tpd1e10b06-tpd1e10b06

    You used 65C but the max Ta is 125C. I think you were just calculating the Tj not the MAX Tj. Is that correct?

  • 0 in reply to Giselle Ventura
    TI__Expert 5290 points

    Hi Giselle,

    That would be correct, if you wanted to consider the Max Tj, you would use the Max Ta (125°C). In the post above, the calculation was for junction temperature during ambient temperatures of 65°C, not the max ambient temperature of the device.

    Good catch there! I hope this clarifies your question.

    Best Regards,

    Josh Prushing

  • 0
    Prodigy 210 points

    Hi Josh,

    I work with Giselle. Can I make a related comment? I think the reasons that some of the engineers think that the max junction temperature is higher than 125C is because the maximum storage temperature is 155C. I would think that the max junction temp would therefore be somewhere between 125C to 155C. Am I missing something?

    Thanks,

    John

  • 0 in reply to John Rodriguez
    TI__Expert 5290 points

    Hi John,

    You are correct in your understanding. In the formula used to calculate Tj, the RθJA * PDEV portion will always be positive, and the max Ta would sum with this. This would indicate that the max junction temperature is higher than the max operating temperature, and I personally have never seen the max junction temperature to be higher than the max storage temperature, especially because the breakdown current used in the calculation (for PDEV) is often either 1mA or 10mA, which when multiplied with the RθJA will result in a much smaller number, often only a few degrees above the max operating temperature.

    For instance, for ESD204, using the formula Tj = TA + RθJA * PDEV, see the following calculation:

    TjMAX = TAMAX + RθJA * PDEVMAX

    TjMAX = 125°C + (262.1°C/W * (7.9V * 0.001A))

    TjMAX = 125°C + 2.07°C

    TjMAX = 127.07°C

    As you can see, this is much closer to the max operating temperature than to the max storage temperature of 155°C.

    Please let me know if you have any questions!

    Best Regards,

    Josh Prushing