• State Resolved
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 52 views
  • Users 0 members are here
Support feedback
Options
Options
Related

Original question:

ESD701-Q1: Designing with ESD701-Q1

ESD701-Q1: Desiging with ESD701-Q1

Sv
Intellectual 615 points
Part Number: ESD701-Q1


Hello Team,
We are using the ESD diode ESD701-Q1 in one of our products.

The second pin is connecetd to the Chassis GND.
All ESD diodes are connceted to the chassis GND where it is further connected to the metallic enclosure and then to the protective earth at the 3 pin AC cord.

The signal can swing upto +/-24V.

We have almost 300 ESD diodes in our system.

For some signals we are getting an short between the signal and the chassis GND.

This could because there is an issue in the wiring or could be the ESd diodes are damged.

Is there any way to identify wether the ESD diodes are damged or not.

 

Looking for your reply

 

 

  • 0
    TI__Intellectual 2250 points

    Hi Sv,

    I usually check the leakage current across the diode at a lower voltage than VRWM. If it's leaking a lot of current, then it's damaged. 

    Best,

    Bryan

  • 0 in reply to Bryan Rodriguez de San Miguel
    Intellectual 615 points

    Hello Bryan,
    Thank you for your reply.

    Is there any method to measure the leakage current of a diode?.
    In our case, the diode is connected to the signal source. Taking the diode out of the PCB is not a good option.

    So if a current source is introduced across the diode, the current can flow through the diode as well as to the signal source.

    Please correct me if I am wrong.

    Looking for your reply

  • 0 in reply to Sv
    TI__Intellectual 2250 points

    Hi, 

    An easier way is to check with a DMM. If you put the DMM in resistance mode, you should OL in the diode in both directions. Same goes for diode mode in the DMM. It should read OL in both directions. If both directions have different readings, there has been damage in the diode, most likely a short. 

    Again, if the diode turns on before it's breakdown voltage then it's most likely shorted. 

    Now, if you can set the current source to our current rating for breakdown voltage, you should be able to read our breakdown voltage. If the voltage read is not in our VBR range, then there is damage in our device.

    Best,

    Bryan