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TSM24CA-Q1: How to compare the ESD performance with that of other components?

Jimmy Chen
Prodigy 60 points
Part Number: TSM24CA-Q1
Other Parts Discussed in Thread: TSM24CA, TPD1E01B04-Q1, TPD4E02B04-Q1

Tool/software:

I am searching for an alternative component of the ESD diode. But I found that although the clamping voltage is the same, the test current is different.

How can we compare two ESD diodes with the same clamping voltage but different test currents?

Main source : SZNUP2105LT1G

Second source : TSM24CA-Q1 

  • 0
    TI__Mastermind 18250 points

    Hi Jimmy,

    The test current will be based on the peak surge current rating of the device. Typically the clamping voltage will be spec'd at their max Ipp rating.

    At lower peak currents, the TSM24CA clamping voltage will be lower. What is your target clamping voltage?

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 60 points

    Hi Sebastian ,

    Could you tell me how to determine the clamping voltage? The picture below shows the specifications of the IC that I need to protect.

     

    The clamping voltage of 40V in the specification sheet is tested at an IPP current of 40A using the waveform specified by IEC 61000-4-5. However, my product needs to pass the test according to ISO 10605, which is similar to IEC 62000-4-2. How can I ensure that this TVS diode can protect my product?

    Thank you for your reply.

    Best regards,

    Jimmy.

  • 0 in reply to Jimmy Chen
    TI__Mastermind 18250 points

    Hi Jimmy,

    The device you are protecting seems to operate at very low voltages, is there a reason you chose 24V ESD diodes?

    Unless there is some DC short condition on the protected line requiring a higher breakdown voltage, you would be better off with a lower voltage device that will have lower clamping voltage. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 60 points

    Hi Sebastian,

    Do you have a recommendation part? Thank you.

  • 0 in reply to Jimmy Chen
    TI__Mastermind 18250 points

    Hi Jimmy,

    TPD1E01B04-Q1 (1-Ch) or TPD4E02B04-Q1 (4-Ch) would be my recommendations here. 

    Regards,

    Sebastian 

  • 0 in reply to Sebastian Muriel
    Prodigy 60 points

    Hi Sebastian,

    But the Clamping voltage of these two parts are larger than our IC spec(3.6V).

    TPD1E01B04-Q1 : 

    TPD4E02B04-Q1 : 

  • 0 in reply to Jimmy Chen
    TI__Mastermind 18250 points

    Hi Jimmy,

    This is a common issue for low voltages devices, the working voltage of the esd diode should be at or above the voltage range of the signal being protected here but the clamping voltage will always be a few volts above the working voltage for most esd diodes. 

    It's important to note that the absolute maximum ratings of the device you're protecting is for DC conditions, while clamping voltage is a transient condition. There should be a few volts margin between the transient failure voltage of that IC and the DC abs max ratings.  Depending on what level of IEC ESD voltage you need to protect from, these devices might still be suitable. Otherwise you would need a low voltage deep snapback esd diode. 

    Regards,

    Sebastian