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TPD1E0B04: Common Anode vs Common Cathode ESD diodes

Sobin Sebastian
Prodigy 20 points
Part Number: TPD1E0B04
Other Parts Discussed in Thread: ESD441

Hello,

Why there are Common Anode and  Common Cathode ESD bidirectional ESD diodes,on what basis should we choose them ?

  • +1
    TI__Expert 5290 points

    Hi Sobin,

    In the bi-directional layout, there is not a functional difference between these two configurations. A bi-directional common anode should function the same as a bi-directional common cathode. The only difference I am aware of is the process used to create the die could potentially optimize certain specifications in one of these configurations. 

    So, in short, the only basis for choosing between these bi-directional configurations is any specifications that fit your application best.

    Please let me know if you have any additional questions!

    Best Regards,

    Josh Prushing

  • 0 in reply to Josh Prushing
    Prodigy 20 points

    Hi Josh,

    Thanks for answering the query. Do we need to add any series resistance to limit current through the ESD diodes.

    Regards,

    Sobin

  • 0 in reply to Sobin Sebastian
    TI__Expert 5290 points

    Hi Sobin,

    In order to address this, I would need to know a little bit more about your application. In general, we do not see a need to limit current through the ESD diode. Below is a TLP graph from one of our devices, ESD441. This device can handle a good amount of current, the voltage will simply just increase as the current does. 

    This increased voltage can be detrimental to your downstream circuitry depending on the absolute maximum voltage of the device you are trying to protect. Generally, with the knowledge of the device/interface, we have recommendations that take into the requirements of the application in order to avoid adding an additional resistor.

    Is there a specific interface/application you are looking to protect? I would be very happy to offer our best solutions for your needs!

    Best Regards,

    Josh Prushing