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THS4532: Input current pulse rating

Part Number: THS4532


from the datasheet and measurements of the THS4532 I assume that the device has steering diodes at the input pins. There is a rating for the continuous input current which is 0.75mA. Since I'm using the device as a bandpass filter for external signals I have to deal with surges (8/20µs) and therefore use clamping devices at the circuit input. Nevertheless there are clamping voltages of about 20 V which are connected  to the input via a 6.8 kohm resistor. This would (assuming steering diodes at the input and a 3.3V supply) result in an input current of ~2.5 mA for a few µs.

So my question are:

1) Are my assumptions about the steering diodes at the input correct?

2) If yes: Is the device able to take the 2.5 mA for let's say 20 µs without taking damage or do I need to put some extra steering diodes at the input?

3) If yes: could you give me some pulse ratings with the maximum allowed input current for different pulse lengths?

Thanks in advance for answering my questions!

Best regards,

Guenther Mader