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TVS3301: design query

Durga Uttarkar
Prodigy 20 points
Part Number: TVS3301
Other Parts Discussed in Thread: TVS3300

Tool/software:

i am looking for a tvs diode, my input circuitry is 60v, and tvs diode for 1kv surge protection. So if i calculate, the clamping voltage comes around 39v for 22.9A surge current. Is ir reliable to use tvs3301 for protecting the circuit. 

  • 0
    TI__Expert 8490 points

    Hi Durga, 

    If your input circuitry is 60V, then you would want the working voltage of the diode to be at or above 60V. Then the clamping voltage will be dependent on what downstream is needing protecting. Typically the clamping voltage is above the working voltage, so TVS3301 would not work for this application. 

    Do you know what is downstream and I can help find a device for you?

    Best,

    McKenzie

  • 0 in reply to McKenzie Eaker
    Prodigy 20 points

    Hi , 

    Actually i might have put my question in a wrong way, input voltage max is 32v, and the tvs needed is 33v.. the circuit next to tvs is 60v(that i mentioned as input circuitry after tvs), so when i apply a 1kv surge, the surge current is 23A and the Vclamp calculated comes as 39V. Anyway, tvs clamps the voltage that is greater than 39V which is protecting the circuit. But is it reliable or should i need to choose the clamping greater than 50V? And do you have any tvs diode rated 33v and the clamping greater than 50V, could you suggest, i hope you understood what i am trying to ask. 

  • +1 in reply to Durga Uttarkar
    TI__Expert 8490 points

    Hi Durga, 

    Makes sense, I think I understand what you are asking. Are there any concerns for shorting the 32V input to the 60V system, similar to like a short to VBUS? Either way, I think TVS3300 should still work and protect your system. If you do need higher than 50V clamping voltage, we don't currently have anything in our portfolio but one competitor device that comes to mind is SMAJ33A. 

    Best,

    McKenzie