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SN65LVDT41: Protection against conducted susceptibility CS114 and CS115

Part Number: SN65LVDT41

I use the SN65LVDT41 in my design to report status to the customer. I also use the receiver to inputs to receive a command from the customer. I want to ask if there's any recommendation for protecting the device against MIL-STD 461F CS114 and CS115 bulk cable injection?

I notice that the equivalent circuit stated in the datasheet has some diode on the output but I assume there is no actual diode inside the IC. Should I put some 5-6V Zener from each differential pair to ground? One thing to note is there is no ground wire between my device and the customer, only the differential pairs get connected.

Best

Thien Nhien Huynh