My question though is why…
It seems like their LF chips are basically an EM41xx tuned to slightly different center frequencies… “unique” is often a general term used to describe an EM4102 which is now replaced by the EM4200… but the T5577 in the NExT or xEM still blows this away with its re-programmable features… so nothing interesting there.
The EM4305 and FDX-B chips can also basically be fully emulated by the T5577. Not sure about the HDX chip but that’s an obscure animal ID chip so who cares really… and then in the 13.56MHz range we have the “Vigo” which appears to be an ISO15693 chip of some kind… can’t find any specifics on it, but probably not all that interesting since it has less memory space than the ICODE SLIX2 they list next to it (xSLX).
So apart from some odd 125khz chips in the upper list (Nova & Titan), I’m just not seeing a compelling reason to bother?