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TPD4E02B04-Q1: DM, DP Lines Voltage Range

Mehmet COBAN
Intellectual 275 points
Part Number: TPD4E02B04-Q1
Other Parts Discussed in Thread: TPD4E05U06-Q1, ESD122, TPD1E05U06

Hello folks,

I am thinking to use TPD4E02B04QDQARQ1 device to protect my PCB from ESD. As you know, TPD4E02B04QDQARQ1 is the passive ESD device and no need to power it. 

In the datasheet, "The TPD4E02B04-Q1 supports signal ranges between –3.6 V and 3.6 V, which supports the SuperSpeed+ pairs on the USB Type-C application. " I wonder that can I use device for protect only DM and DP line? My type-c suppy voltage will 5 Volts but I think DM and DP lines cannot achive to 5 Volts. It should be lower, I dont know. 

If it is not suitable for my design, could you evaluate TPD4E05U06-Q1?

By the way, This project is not BC1.2. Only passthrough from one connector to another. 

Regards,

Mehmet.

  • 0
    TI__Prodigy 340 points

    Hello Mehmet,

    This is an excellent question, the USB Type-C high speed lines will need an ESD diode which can support voltage of +3.3V, also USB Type-C connector houses 24 pins in a small form factor so board space becomes very constrained. 
    For this reason, 2-channel ESD devices with ultra-low capacitance (ESD122) are recommended for all high-speed data lines in USB Type-C.  However, 4-channels such as TPD4E02B04DQA can also be used if it can accommodate better the layout of your PCB.

    Single-channel 5.5-V ESD devices (TPD1E05U06) are recommended for the SBU and CC lines to simplify routing to the PD or CC controller. 

    Please take a look at out System Level ESD protection guide, page 16 (System-Leve ESD Protection Guide (Rev. C)) which goes over this application and will provide you with different recommendations that you can implement based on layout preferences. 

    Please let us know if you have further questions, we will be happy to help.
    Thanks, Erika

  • 0 in reply to Erika Beskar
    Intellectual 275 points

    Hi Erika,

    Thank you for yor great explanation. I really liked that. But, unfortunately I have one more question: 

    As you said " USB Type-C high speed lines will need an ESD diode which can support voltage of +3.3V". How about DM and DP lines? I also want to protect these lines from ESD. Is it necessary to protect these lines? If yes or optional, can I use the devices you mentioned above? Is voltage support of the ESD protection devices important ? Or I must be careful only singal speed? (ex. low-capacitance ESD protection that can support a 480-Mbps signal) 

    Your reply and document were so understandable. Thanks again.

    Mehmet.

  • 0 in reply to Mehmet COBAN
    TI__Prodigy 340 points

    Hi Mehmet,

    Thanks for the follow up questions.
    For the first question:  How about protection form my DM and DP lines?  

    In USB Type C connector, the 4 D+/D- lines carry a single USB2.0 data pair (up to 480-Mbps)

    The D+ and D– data lines will require low-capacitance ESD protection that can support a 480-Mbps signal. Single-channel and dual-channel devices are good solutions to simplify routing *see page 12 of System-Leve ESD Protection Guide (Rev. C) you can also use ESD122 for DP/DM*

    As far as your questions "Is voltage support of the ESD protection devices important ? Or I must be careful only signal speed? (ex. low-capacitance ESD protection that can support a 480-Mbps signal)"

    The working voltage of your diode has to be same level or slightly above the voltage level of the signal on the connector pin you are protecting.  The capacitance as you stated, has to also be chosen carefully to avoid any distortion on your data (high speed lines require low cap diodes).

    Hope this helps, please feel free to ask further questions if more clarification if needed.

    Thanks, Erika