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ESD751: connection across ground or earth

beesetty rajesh
Expert 1065 points
Part Number: ESD751

Dear Experts,

Are the ESD diodes are to be connected across the line and signal return or the earth(chasis)?

Regards,

Rajesh BN.

  • 0
    TI__Expert 3060 points

    Hi Rajesh, 

    If I am interpreting your question correctly, you are asking whether the protection diode is connected in series or in parallel. Please correct me if I am wrong, but I have provided a few images that should be helpful. 

    The image below shows the ESD diode should be connected in parallel with the protected IC/device. 

    I am not sure if you were specifically asking about ESD751 but hopefully the above application diagram helps explain where this device fits into the system.

    Please let me know if you have additional questions. 

    Best Regards, 

    McKenzie Eaker

  • 0 in reply to McKenzie Eaker
    Expert 1065 points

    Dear Eaker,

    I am afraid your interpretation is not I meant. Anyways, the diagram you have attached helps to put the question more clearly. The circuit shows the ESD diodes are connected across the line and signal return.

    My doubt is, do the ESD diodes are connected between line and earth(i.e chassis).

    Regards,

    Rajesh BN.

  • 0 in reply to beesetty rajesh
    TI__Expert 3060 points

    Hi Rajesh, 

    My apologies for interpreting your question wrong. Yes, for ESD diodes it is best to connect the ground pin to the ground chassis. This shunts current away from the sensitive device in your application. Please refer to the following E2E posts for more clarification: link1, link2

    Please let me know if you have additional questions or comments. 

    Best Regards, 

    McKenzie