Can I use a TVS diode as an EMI suppressor in long cables?
Of course you can use these but the real question you need to answer is:
&quot;Will this provide EMI suppression in my application?&quot;
In my opinion the answer is &quot;NO&quot; for this TVI device.  It's purpose is to provide ESD protection NOT to provide EMI suppression in a cable.
So the answer here is: NO, TVS diodes are NOT effective EMI suppressors.