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THVD1500: VCC Pin ESD Protection

Part Number: THVD1500

Hi,

We are using THVD1500 at 5V. The board is powered using 5V over a connector and we have added a 5V TVS diode at the connector. 

The clamping voltage of the TVS diode is around 9.2V whereas the absolute maximum rating of VCC pin is 7V.

Would this cause an issue (potentially damaging the transceiver) or it is fine since it is a momentary surge pulse?

  • The voltage at the VCC pin must not exceed 7 V, not even for a short time.

    In general, power supply lines are not ESD protected because the decoupling capacitors can handle it. (The ESD protection of other signals is usually implemented by shunting the energy of the ESD pulse into the power supply.)

    Do you expect ESD or transient events that have enough energy to charge your capacitors to more than 7 V?

  • Thanks Clemens!

    Hi Akash,

    Keep in mind that the supply pins of this device also have limited internal ESD protection. However as Clemens points out, large voltage spikes are often dampened by the large amount of capacitance on power lines. Let us know if you have any more questions. 

    Regards,
    Eric Schott