EM4100

Consider four key factors: frequency band (LF for animal tracking, HF for item-level, UHF for supply chain), memory requirements (EPC memory for identification, user memory for data), read range (centimeters for HF vs meters for UHF), and cost per unit at your expected volume. For basic supply chain, Impinj Monza R6 is cost-effective. For high-security applications, NXP UCODE DNA offers cryptographic authentication.

EPC memory stores the Electronic Product Code, the unique identifier for each tagged item (typically 96 or 128 bits). User memory is additional storage available for application-specific data such as batch numbers, expiration dates, or sensor readings. Not all tags have user memory. For example, Impinj Monza R6 has 96-bit EPC but zero user memory, while Impinj Monza 4QT offers 512 bits of user memory.

RAIN RFID is an industry alliance that certifies UHF RFID products for interoperability based on the GS1 UHF Gen2 (ISO 18000-63) standard. A RAIN-certified tag or reader has been tested to ensure it works reliably with other RAIN-certified equipment, regardless of manufacturer. This is analogous to Wi-Fi certification for wireless networking.

Read range depends on the frequency band and tag type. LF tags (125-134 kHz) read at up to 10 cm. HF tags (13.56 MHz) read at up to 1 meter. UHF tags (860-960 MHz) can be read from 1 to 15+ meters depending on tag sensitivity, reader power, antenna design, and environmental factors. On-metal tags typically have reduced range unless specifically designed for metal surfaces.