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TPD4E02B04: USB-Type C Connector ESD Protection Part Number Recommendation

Part Number: TPD4E02B04
Other Parts Discussed in Thread: TPD4E05U06, ESD122

Hi,

I'm using a USB Type C connector on my design. I'm only enabling USB 2.0 communication and power levels. I've selected the TPD4E02B04 as a protection device. Is this the best choice? I also see the TPD4E05U06 mentioned in the datasheet. Also, does my connection to the protection device look ok?

  • Hi Gus,

    There are two big differences between TPD4E02B04 and TPD4E05U06: the working voltage (Vrwm) and the polarity. TPD4E02B04 is a 3.6 V bidirectional part. That means that it will protect signals whose normal working voltage is between -3.6 V and 3.6 V. TPD4E05U06 is a 5.5 V unidirectional part. That means that it will protect signal whose normal working voltage is between 0 V and 5.5 V. You can learn more about this here

    One reason I can think of of why the TPD4E05U06 is in the datasheet is because the pins it is protecting are close to the 5 V VBUS pin. For example, if a 5 V pin on a cable going into the connector accidentally touches the SBU2 pin, you would need at least a 5 V diode on that line. If not, the diode would burn up due to the length of the event. ESD diodes are only meant for events in the 100 nanosecond range. 

    So to answer your question, I might go with the TPD4E05U06 near 5 V sources and TPD4E02B04 for higher speed data lines since it has a lower capacitance as the example on the datasheet shows. However, if all your signals are expected to oscillate between positive and negative voltage, I would go with all bidirectional devices. Vice versa for unidirectional. This is to ensure you get the best protection possible. The connections look good on your schematic as well.

    Let me know if this answered your question or if you need clarification on anything. 

    Regards,

    Matt Smith

  • Hi Matt,

    Thanks for clarifying that. Since the USB2.0 DP/DM pins operate between 0 and 3.6V, it'd be better to use the TPD4E05U06, do you agree?

  • Hi Gus,


    Since the DP/DM pins aren't next to VBUS, you can get away with a lower Vrwm. I would recommend ESD122. It'll have better performance even if it is bidirectional. This is assuming that the voltage won't go above 3.6 V. If voltage is expected to go above 3.6 V, I would stick with the TPD4E05U06.

    Regards,

    Matt Smith