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Original question:

ESD-protection diode selection

ESD Protection for 3.3 V and 5V

Abhishek singh
Expert 2000 points
Other Parts Discussed in Thread: TPD1E1B04, ESDS302

Hi Team 

I am looking for ESD  protection at  3.3 and  5V, I have a  doubt regarding the selection of part is that if the reverse standoff voltage is  5V  then in general clamping voltage will be more than 8V. Then at the ESD  event  8 volts will be appearing across pin. In that case, does  ESD  diode will able to save the pin in case of an ESD  event.

Please suggest  us parts for  GPIO (3.3  and  5V ) and it will be really helpful if you can explain to me how it will save my pin.  

Let's say I am using TPD1E1B04  for  3.3V  GPIO  then at the time of  ESD  6 V will come. How  it  will save  my pin and  why I should use  this.

  • 0
    TI__Genius 10652 points

    Abhishek,

    Thanks for your question. This product family was recently moved to another group, but it seems that the E2E is still assigned to our team for some reason.

    I assigned to to the right team now, please wait for their response in next day. They 100% be able to provide help with your question though so don't worry.

    best

    dimitri

  • 0
    TI__Genius 9806 points

    Hi Abhishek,

    For TPD1E1B04, the reverse standoff voltage (Vrwm) is 3.6 V, and the clamping voltage (Vclamp) is 6.3 V. This means that you can apply up to 3.6 V to your system without the diode drawing any significant amount of current. After that, the diode will begin to breakdown and start conducting more of the current towards itself rather than your system.

    Vclamp describes the maximum amount of voltage your system will receive, so when an ESD event happens, your system will receive at max 6.3 V.  If your system cannot withstand 6.3 V, I would suggest picking a part with a lower clamping voltage. 

    If you need more information about ESD protection, please feel free to read these guides on how it works: www.ti.com/.../support-training.html

    Regards,

    Matt Smith

  • 0 in reply to Matt Smith
    Expert 2000 points

    Hi  Matt 

    Thanks for this reply my concern here is that I can't find any part having a 3.3V standoff and clamping voltage  3.6Volts. So does it will be useful to use a higher clamping voltage part. How it is better to have no protection at all.

  • 0 in reply to Abhishek singh
    TI__Genius 9806 points

    Hi Abhishek,

    While we don't have a part with Vrwm of 3.3 V and Vclamp of 3.6 V, we do have some parts that have a Vrwm of 3.3 V and a Vclamp of 5.5 V, such as ESDS302. 

    Let's say that an ESD event of 2 kV occurs on an external port of your system, like a static shock from your finger. If you don't have an ESD protection device on the port that is shocked, the system will receive all 2 kV from that port and likely be damaged. If you have an ESDS302, for example, attached to that port, your system will only receive 5.5 V and is much more likely to remain undamaged.  

    Regards,

    Matt Smith