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TVS3300: TVS Diodes in series

Jan Bock
Expert 3025 points
Part Number: TVS3300

Hello Team, 

is it possible to put two or more TVS330x in series to get a higher clamp voltage?

Thanks 

Jan

  • 0
    TI__Genius 9656 points

    Hi Jan,

    In theory, this could work. However, we have not tested our devices for this scenario, so we can't guarantee a specific voltage. I'm assuming you mean Vrwm and not clamping voltage.

    Regards,

    Matt Smith 

  • 0 in reply to Matt Smith
    TI__Expert 3025 points

    Hi Matt, 

    thank you for the quick answer. My customer builds a servo drive board and want to protect the mosfets against surge. The application of their customers is typically battery driven 48V. They can have voltages up to 80V on the motors. The customer talked about clamp voltage, but I think he meant Vrwm. Do we have another solution for this type of application?

    Thanks 

    Jan

  • 0 in reply to Jan Bock
    TI__Expert 3025 points

    Hi Matt, 

    one update from the customer. You were correct- they looked for Vrwm ~ 65V and they now ordered samples and will try to put two flat clamp diodes in series. The case that they try to cover here is not a battery applied application. They look into the case when their servo drive will be supplied via a long wire. The current that can flow through this wire can be up to 45A peak at 60V. 

    Do you have any concerns with putting to diodes in series? 

    If have a better concept for protecting against surge in a 60V application let me know. 

    Regards

    Jan

  • 0 in reply to Jan Bock
    TI__Genius 9656 points

    Hi Jan,

    Probably the biggest thing that the customer will notice is that the clamping voltage (ie. the voltage the system receives during a surge event) will be much higher since there will be more resistance on the line with the 2 devices as opposed to 1.  This is the only solution we have for this working voltage right now since our highest Vrwm in our portfolio is 33 V with TVS330/1. Please keep me posted on what the customer's results are when they test this.

    Regards,

    Matt Smith