ADA4254 ESD immunity and umpowered behavior

I'm using the ADA4254 in an application that requires IEC 61000-4-2 ESD testing, and I have the following questions:

1.  During powered operation, is a TVS on each input sufficient to protect the device from an surge event provided that the clamping voltage of the TVS stays within the VSSH +/- 60V requirement?  If not, what protection network is recommended?

2.  When the device is unpowered, does the 60V clamp still protect against surges or does the input need to be diode-shunted to the power rails in that scenario?

Thank you.

  • 0
    •  Analog Employees 
    on Mar 25, 2021 12:04 AM

    Hi fsather,

    Good day!
    For your inquiries, as long as the voltage surge is within the abs max rating shown, the device will be able to withstand it.
    But I wouldn't also suggest going very close to the abs max shown on table 3 of the device.

    I would have to check in with the designer for your second inquiry when the device is powered off to be sure.
    I'll get back to you as soon as I can.

    Thanks fsather.

    Best Regards,
    Dann