TPD1E10B06: The current captured by the oscilloscope is 4mA.Is that normal?

Timsen

Part Number: TPD1E10B06

Dear all：

There are two boards A and B for communication. The length of communication line is about 3.5 meters ~4M. TPD1E10B06 is used for ESD protection of signals. The current between the pins of ESD devices and the ground is about 4mA measured by the current probe clamp of oscilloscope.

However, the data sheet of TPD1E10B06 indicates that the normal working current should be less than 100nA.By replacing the TPD1E10B06 device and removing the 3.5m communication line, the oscilloscope captures a current of 4mA.Schematic diagram and test current waveform are shown below.Is that normal?Please help to analyze the reason

over 4 years ago

0 Rakesh over 4 years ago

TI__Guru* 95791 points

Hi Timsen,

Most of the folks are out due to holidays. We will get back by early next week.

BR, Rakesh

0 Timsen over 4 years ago in reply to Rakesh

Expert 1660 points

Hi Rakesh：

Any Suggestions? Please help answer this question

0 Rakesh over 4 years ago in reply to Timsen

TI__Guru* 95791 points

Hi Timsen,

I have sent reminder to the responsible engineer. He will get back to you soon.

Best Regards, Rakesh

0 Cameron Phillips over 4 years ago in reply to Rakesh

TI__Genius 12410 points

Hello,

This device is not going to pull 4mA of current unless the voltage is above the breakdown or the device is damaged.

Do you know that the DI and DO lines do not normally pull this current? Or have you seen the system operating normally before?

0 Timsen over 4 years ago in reply to Cameron Phillips

Expert 1660 points

Dear Cameron：

But the current waveform I measured with the oscilloscope was in the case of normal communication.Why does TPD1E10B06 have a current of 4mA?

0 Cameron Phillips over 4 years ago in reply to Timsen

TI__Genius 12410 points

Hello,

During normal operation does the channel communicate with 4mA? How do you know that the TPD1W10B06 is taking the 4mA?

0 Timsen over 4 years ago in reply to Cameron Phillips

Expert 1660 points

Dear Cameron:

During normal communication, I used the current probe of the oscilloscope to clip the line from the TPD1W10B06 device to the ground (as shown in the red circle in the following figure), and measured about 4mA current. The current waveform is as shown in the figure above

0 Cameron Phillips over 4 years ago in reply to Timsen

TI__Genius 12410 points

A current probe has noise associated with it. I would not trust it to measure ~1mA and below. Do you have an SMU that can accurately tell you the current during the time?

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TPD1E10B06: The current captured by the oscilloscope is 4mA.Is that normal?