Hello,
Thanks for your interest in ST25 NFC Tag products.
To ensure interoperability between an iPhone and a very small tag ( so mounted on on a very small antenna form factor,I guess this is what you target), it is needed to have a tag with a big tuning capacitance.
in ST25 porfolio we have NFC tag products with 99pF tuning capacitance to target the smallest tag antenna.
Nevertheless the performance and the smallest antenna to be detected will depend on the system where the tag is included. if the tag is embedded in a box or on a wearable product it is not the same . The environment in important. NFC technology is for example sensitive to metal presence and interoperability will be impacted.
You can contact our ST sales office to get more support on this topic.
I hope this helps,
Best Regards,
BB
