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TPD1E10B06: Reverse current and reverse voltage problems

Part Number: TPD1E10B06
Other Parts Discussed in Thread: TEST

Dear all:

         My product has two boards, and there are data lines for communication between them. I use TPD1E10B06 for protection.In practice, the length of the data line may reach 3.5 meters.

The long wire will be inductance on the wire, forming the reverse current and the reverse voltage. The following is the waveform I tested
Question: will the reverse current and voltage generated by the 3.5 meter long wire be higher?Will it affect the normal use of ESD?

  • Because the TPD1E10B06 is designed to be  a bidirectional device. The operation of your system should  not be impacted by the ESD diode

    Regarding the inductance. As far as the voltage on you system does not cause ESD diode to turn on and go beyond the breakdown voltage for a long period of time in uS range, the TVS should operate normally - which is protect your system in the event of an ESD and when no ESD, allow the system to operate normally.

  • Dear obi:

            I have tested the ESD current in the normal communication between the signal line and ESD tube with a serial ammeter. It is about 4mA. Is it normal?When ESD is not in action, it is in high impedance state. What is the theoretical current level?

  • Thanks for the clarification Timsen. In normal operation if the voltage is within the reverse working voltage the current should be less than 100nA. At breakdown of 6V it can be up to 1mA

  • Dear obi:

           Why did I string the ammeter between the signal line and the ESD tube, to test the ESD tube current during normal communication and detect 4mA ? is ESD damaged?

  • Hello,

    This device is a simple ESD diode with breakdown minimum of 6V. This means the device cannot take 1mA until a minimum of 6V. If you are measuring 4mA through the device it is either broken or the test setup is wrong and you are not actually measuring the current through the ESD diode.

    Did you stress the device more than the waveform shown? It could be that the inductive ringing of the wire caused the device to be damaged. Can you capture  that waveform?