Description Texas Instruments’ Tag-it HF-I Plus transponder inlays consist of 13.56-MHz high-frequency (HF) transponders that are compliant with the ISO/IEC 15693 and ISO/IEC 18000-3 global, open standards. These products offer a user-accessible memory of 2K bits, organized in 64 blocks and an optimized command set, available in six different antenna shapes with frequency offset for integration into paper, PVC or other substrates.