You noticed right, I also see this being marketed lately a lot, even for bog standard parts like TL071 where TI has new "improved" series TL07XH that claim " High ESD (1.5 kV, HBM), integrated EMI and RF filters"...
I was actually thinking of ordering some to see what it actually means, because datasheet doesn't specify a single number to that regard, except ESD resilience.
No mention what EMI and RF filters do, what are the characteristics or how it was measured and how can be verified..
Is it RF filters in signal path? Is improved PSRR on power inputs? What ?
But it has a typo where unity-gain bandwidth became "
Utility-gain bandwidth" in some tables ...
In layman terms, if that means that bass guitar amplifier will be more resilient to those pulses you get when you put your GSM phone nearby, just by changing out old TL071 to new TL071H that would be great.
But it won't. That is all about circuit and layout of the components, grounding and shielding.
So I really don't know what they mean by it.