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TPD1E1B04: Query about clamping voltage of TPD1E1B04

Part Number: TPD1E1B04
Other Parts Discussed in Thread: STRIKE, TPD1E04U04

Hi,

I am looking for TVS diode for pushbutton connected to MCU GPIO and UART pins connected to non inverting buffer against ESD(+/- 4 KV contact,+/-8 KV air discharge),EFT protection (+/-1KV).

End application having typical operating voltage 3.3 V, MCU GPIO absolute max voltage 3.6 V and buffer absolute max voltage 7.0 V. I found TPD1E1B04 TVS diode having Vrwm = 3.6V , Vbr= 6.4V, Vclamp = 8.5V. For 4 KV ESD, expected current : 15A. As per TLP curve , diode clamping voltage : 8.5V@15A. Does it suitable for our requirement? Please provide your guidance on selection for clamping voltage & peak pulse current parameters.

Also, Does it required unidirectional or bidirectional TVS diode?

Regards,

Ritul

  • Hi Ritul,

    Welcome to E2E!

    For IEC 61000-4-2 a 4kV ESD strike corresponds to 8A TLP current and 8kV corresponds to 16A TLP current. Click this link for more info on ESD clamping voltage.

    Per the TLP curve of the TPD1E1B04 at 4kV the clamping voltage will be ~7.5V and at 8kV the clamping voltage will be ~8.5V. The MCU will be exposed to voltages that exceed the buffer absolute max voltage of 7V, but will only be for a very short amount of time(~100ns). The TPD1E1B04 has been used for GPIO's  in other customer applications meaning that the short exposure to the voltage exceeding the abs max should not be a problem, but you could reach out to the manufacturer of your MCU to see if this is acceptable for their device.

    A unidirectional diode is used when the voltage signals will only range between 0V and the working voltage of the diode. If the voltages on the signal lines will be bi-polar meaning that it'll have both negative and positive voltages then a bi-directional TVS diode should be used. A bi-directional can protect a uni-directional application, but it will not clamp negative voltages until the negative voltages have exceeded the negative breakdown voltage. If a uni-directional device is preferred you may also take a look at the TPD1E04U04.

    Best regards,

    Andy Robles

  • Hi Andy,

    Thanks for sharing reply.

    Please provide us ROHS3 compliance certificate for the same.

    Regards,

    Ritul

  • Hi Ritul,

    Could you provide an example of what you mean by the RoHS compliance certificate?

    On the datasheet of the TPD1E1B04 in the "Package Option Addendum" on Page.14 we state that the TPD1E1B04 is RoHS compliant.

    Best regards,

    Andy Robles

  • Hi Andy,

    There is a declaration of restriction or no. percentage of 10 ROHS substances against EU/ROHS: 2015/863 in ROHS certificate.

    Please provide me ROHS3 certificate for the same.

    Regards,

    Ritul 

  • Hi Ritul,

    You can access the material content on the our devices by going to Material Content on TI.com.

    Search the part number TPD1E1B04 and select one of the TI part numbers from the list. You will be able to get all the information of materials in the device with the option to download the data in different formats. For further assistance please use the link found at the bottom of the webpage to contact TI customer support.

    Best regards,

    Andy Robles