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TPD1E05U06-Q1: Comparison to Central CFTVS5V0BULC BI-DIRECTIONAL TVS

Shmuel Davis
Expert 2920 points
Part Number: TPD1E05U06-Q1
Other Parts Discussed in Thread: TPD1E05U06, STRIKE, TPD2S300, TPD6S300

Does the TPD1E05U06-Q1 have any benefits over the Central CFTVS5V0BULC BI-DIRECTIONAL TVS

  • 0
    TI__Expert 3500 points
    Shmuel-

    The TPD1E05U06 will have significantly lower clamping during an ESD strike, leading to more robust ESD protection. Our datasheet spec is that at 1A of ESD current, we will clamp to 10V and at 5A we will clamp to 14V. The CFTVS5V0BULC however tates that at 1.6A it will clamp to 15V and at 3.3A at 20V. As you can see, it does a much worse job of regulating voltage during an ESD strike. The CFTVS device also has 10x as high of leakage. I would recommend that for a robust protection stage you stick with using the TPD1E05U06.

    Thanks,
    Alec
  • 0 in reply to Alec Forbes
    Expert 2920 points

    Dear Alec,

    Thank so much for that info !

    What about the fact that the  Central CFTVS5V0BULC is BI-DIRECTIONAL  and the TPD1E05U06 is not ?

    Best regards

    Shmuel 

  • 0 in reply to Shmuel Davis
    TI__Expert 3500 points
    Shmuel-

    You are correct that their device is bidirectional. Whether you want bidirectional or unidirectional protection depends on the application and whether it has +/- polarity or only positive polarity. What application is this for?

    Thanks,
    Alec
  • 0 in reply to Alec Forbes
    Expert 2920 points

    Dear Alec,

    I am using these TVS diodes to protect my USB 3.0\3.1 super speed differential signals - thus appears that I should be using a Bi-directional Diode not uni-directional diode no ??????

    Best regards

    Shmuel

  • 0 in reply to Shmuel Davis
    TI__Expert 3500 points

    Shmuel-

    Sorry for the delay here! Either unidirectional or bidirectional diodes work for USB 3.0/3.1 SS lines because they have differential lines biased around a positive voltage, so it will not drop below zero volts.

    The easiest way to get recommendations for ESD devices on an interface is to check our newly released ESD Interface guide which will give the best options for each interface.

    Let me know if you have any other questions!

    Thanks,

    Alec

  • 0 in reply to Alec Forbes
    Expert 2920 points

    Dear Alec,

    Thanks for the update and the guide. I briefed over it and it was interesting. A couple questions queries :-

    1. Since the TPD1E05U06 is uni-directional, doesn't it have the draw back c.f. bi-direction diode that care has to be taken on the polarity of the placement of the part during production ?

    2. In the guide it outlines the protection required for Type C solutions. I have placed TPD6S300 (which supposedly takes care of the ESD protection for the USB 2.0 lines and the CC lines) and a TPD2S300 for my 2nd TYPE C connector that has only CC lines connected (which supposedly takes care of the ESD protection for these CC lines). In the guide that you recommended it states that  "Device level ESD specifications are not sufficient to protect devices in a system." and "The silicon area required to implement system-level ESD protection is much larger than what is required for device-level". Is it correct that the TPD6S300 \ TPD2S300 provide the system level protection and not the device level protection ? It appears that the TPD6S300 \ TPD2S300 do not provide as much protection as the TPD1E05U06, however do they provide sufficient for my application ? 

    Best regards

    Shmuel 

  • 0 in reply to Shmuel Davis
    TI__Expert 3500 points
    Shmuel-

    I've sent you a message with my email separately to discuss offline. To answer these questions here however:

    1) Yes, because it is unidirectional you will have to consider polarity in your manufacturing. However, this unidirectional operation means you will have much better and more robust clamping in the negative direction so it is often worthwhile.

    2) By device level ESD specifications, the guide is referring to the HBM/CDM type specifications that are in all IC datasheets. You want to ensure that components are specified according to IEC61000-4-2 ESD which is system level protection. The TPD6S300 and TPD2S300 are specified according to this IEC standard, so they will provide good protection as will discrete ESD solutions.

    Thanks,
    Alec