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Original question:

TVS1400: Interface forum

TVS1400: TVS1400

Sudarshan KR
Intellectual 840 points
Part Number: TVS1400
Other Parts Discussed in Thread: TVS0500, TVS0701,

Hi,

In my earlier post i had raised the below query 

Planning to use TVS1400 on 12V DC line and TVS0500 on 6.2V DC Line.  Since on TVS0500 VRWM is 5V, but the Clamping voltage is 9.2V and the Vbr is around 7.7V Are my part selection OK

and the response was 

TVS0500 will not work as intended on a 6.2V DC line. We recommend that the DC voltage should be either equal or less than the working voltage to avoid any conduction, unnecessary clamping or leakage. You will have to step up the device used to TVS1400.

I have gone through the datasheet once again, though the Vrwm is 5V, but the actual clamping and the breakdown for this device is more than 7V.  So please let me know why we cannot use this device for 6.2V Rail.

I have attached TVS0500 for your reference.  From the FIg1, Fig2, Fig5,(on Page 7) it looks like the device can be used until 7V. Please provide your feedback

tvs0500.pdf

Regards,

Sudarshan

  • 0
    TI__Expert 8471 points

    Hi Sudarshan,

    Although the breakdown voltage is around 7.7V, you will still experience unwanted leakage current after you exceed the Vrwm of 5V. TVS0500 is rated for a max leakage current of 5.5 nA at 5V. Once you pass 5V, the leakage current will increase exponentially as you approach breakdown voltage. This might result in your system not working properly. Please refer to figure 1 on this page for an I-V graph of how this behavior works.

    As for the clamping voltage, that is the voltage the system will receive when an ESD or surge occurs. So, when designing your system, you want to make sure that it can handle the voltage level that Vclamp is specified at.

    Also, you might want to consider using TVS0701 instead of TVS1400. The clamping voltage of TVS1400 is 20.5V and might be too much for your system to handle. TVS0701 has a clamping voltage of 11V.

    Regards,
    Matt Smith