Hi Mathieu,
the read range depends on many factors:
- tag technology (i.e. ISO/IEC 15693 tags are designed to have a greater read distance than ISO/IEC 14443 tags)
- antenna size (tag and reader)
- etc.
On my X-NUCLEO-NFC03A1, depending on the tag, I can achieve the following read ranges
- 3.2 cm and up to 5.2 cm for ISO14443 tags
- 4.6 cm and up to 9.2 cm for ISO15693 tags
Tag antenna having credit card size generally provides better read range than small button size antenna.
You can also consider using ST25R3916 reader (X-NUCLEO-NFC06A1) that will provide better read distances than ST25R95 (X-NUCLEO-NFC03A1).
Feel free to share more information about your application (in private or on this forum) so that we can provide more accurate support.
Rgds
BT