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TPD1E1B04: can not protect TUSB4041I with 20kV contact discharge ESD

KevinZhang123
Expert 5740 points
Part Number: TPD1E1B04
Other Parts Discussed in Thread: TUSB4041I, , STRIKE

Hi, Team

My car infotainment customer is using TPD1E1B04 and TUSB4041I in their product. 8 pcs of TPD1E1B04 are put on DP and DM pins of all 4 downstream ports of TUSB4041I. Customer use ESD gun to contact discharge 20kV ESD on the D+ and D- pin (which are connected to DP and DM pins of TUSB4041I) of the USB socket. The corresponding DP and DM pin of TUSB4041I will be broken, but the TPD1E1B04 is still OK.

TPD1E1B04 can stand 30kV contact discharge, why it can not protect TUSB4041I on 20kV contact discharge?

Is customer's test method correct?

Is there any suggestion to improve the performance?

Thanks

Kevin Zhang

South China Analog FAE

  • 0
    TI__Genius 12410 points

    Kevin,

    I apologize for the delay in response.

    What is happening is that the clamping voltage of the TPD1E1B04 is higher than required for the TUSB4041I.

    What is the kV level that you want to pass?

    Regards,

    Cameron

  • 0 in reply to Cameron Phillips
    TI__Expert 5740 points

    Hi, Cameron

    Customer usually test 8kV. They just increase the level to guarantee reliability.

    The situation is:

    Customer is using TUSB4041I in before-market Infotainment System. The downstream ports (pin 33 D+ and pin 34 D-) are connected to an external T-Box. The product is mass production and they find three TUSB4041I are failure in end-customer's car. Pin 33 and pin 34 are shored to GND in 2 failure units, Pin 33 and pin 34 are short together in 1 failure unit.

    Here are the FA report of the two units. The third unit is still under FA.

    QEM-CCR-1709-00009.pdf

    QEM-CCR-1710-00243.pdf

    Here is customer schematic:

    TUSB4041I Schematic.pdf

    Customer use MLP7 for ESD protection at first. Here is datasheet of MLP7:

    Bus_Elx_DS__0603ESDA-MLP.pdf

    As the clamping voltage of MLP7 is 35V, which is too high, I promote TPD1E1B04.

    What is the possible reason of the failure do you think?

    Is TPD1E1B04 suitable for this applicaiton and can fix the issue?

    Any better suggestion?

    Thanks

    Kevin

  • 0 in reply to KevinZhang123
    TI__Genius 12410 points
    Kevin,
    I apologize for the delay in response.
    So I misunderstood from your first question I thought you meant that the TPD1E1B04 did not protect. I believe that it will protect and I believe that the reason why the 0603ESDA-MLP did not protect was because as you said the clamping voltage is too high. The reason the clamping voltage for that device is so high is because the breakdown is 30V.
    The clamping voltage of the TPD1E1B04 is 8.5V at 16A TLP which is ~8kV ESD strike. However the TPD1E1B04 is in the 0402 package not the 0603

    Let me know if you need anything else.

    Regards,
    Cameron