ST25TV512 vs Tag-it HF-I Plus

ST25TV512 offers 64 bytes with advanced security (password encryption, tamper detect, digital signature) vs Tag-it HF-I Plus with 256 bytes and block locking.

Side-by-side specs

Frequency

ST25TV512: 13.56 MHz
Tag-it HF-I Plus: 13.56 MHz

Protocol

ST25TV512: ISO/IEC 15693, NFC Forum Type 5
Tag-it HF-I Plus: ISO/IEC 15693, ISO/IEC 18000-3

Memory

ST25TV512: 512 bits (64 bytes) EEPROM user memory
Tag-it HF-I Plus: 2048 bits (256 bytes) user memory organized in 64 blocks of 32 bits each, EEPROM

Interface

ST25TV512: RF (contactless)
Tag-it HF-I Plus: RF (contactless)

Temp Range

ST25TV512: -40°C to +85°C
Tag-it HF-I Plus: -40°C to +85°C

Form Factor

ST25TV512: UFDFPN5 (1.7×1.4 mm), sawn/bumped wafer (75 µm or 120 µm)
Tag-it HF-I Plus: Wafer (200mm / 8 inch), die size 1296 × 1116 μm (excluding scribe), available with grinding to 265 μm or 150 μm, NI/AU or AU bumps, sawn on foil frame

Security

ST25TV512: Two 32-bit passwords (or one 64-bit), TruST25 digital signature, Kill mode, Untraceable mode, password encryption, tamper detect (optional), EAS
Tag-it HF-I Plus: Individual block locking (user and factory lock bits), unique 64-bit UID factory-programmed and locked

Spec	ST25TV512	Tag-it HF-I Plus
Frequency	13.56 MHz	13.56 MHz
Protocol	ISO/IEC 15693, NFC Forum Type 5	ISO/IEC 15693, ISO/IEC 18000-3
Memory	512 bits (64 bytes) EEPROM user memory	2048 bits (256 bytes) user memory organized in 64 blocks of 32 bits each, EEPROM
Interface	RF (contactless)	RF (contactless)
Temp Range	-40°C to +85°C	-40°C to +85°C
Form Factor	UFDFPN5 (1.7×1.4 mm), sawn/bumped wafer (75 µm or 120 µm)	Wafer (200mm / 8 inch), die size 1296 × 1116 μm (excluding scribe), available with grinding to 265 μm or 150 μm, NI/AU or AU bumps, sawn on foil frame
Security	Two 32-bit passwords (or one 64-bit), TruST25 digital signature, Kill mode, Untraceable mode, password encryption, tamper detect (optional), EAS	Individual block locking (user and factory lock bits), unique 64-bit UID factory-programmed and locked

Verdict

Choose the ST25TV512 if you need advanced security features in a compact memory footprint. With 64 bytes of EEPROM user memory, this chip provides password protection using two 32-bit passwords or one 64-bit password with encryption, TruST25 digital signature for authentication, tamper detection capabilities, and privacy modes including Kill and Untraceable modes. It supports ISO/IEC 15693 and NFC Forum Type 5 protocols, making it suitable for authentication applications, anti-counterfeiting, secure product identification, and privacy-sensitive use cases where cryptographic verification and tamper evidence are more important than data storage capacity. The EAS (Electronic Article Surveillance) feature also makes it appropriate for retail security applications. Choose the Tag-it HF-I Plus if you require four times the memory capacity with simpler block-level protection. With 256 bytes of user memory organized in 64 blocks of 32 bits each, this chip provides significantly more data storage than the ST25TV512 while supporting ISO/IEC 15693 and ISO/IEC 18000-3 protocols. Security is handled through individual block locking with both user-configurable and factory lock bits, plus a unique factory-programmed and locked 64-bit UID. This makes it well-suited for item-level tracking, inventory management, library systems, and supply chain applications where larger datasets need to be stored per tag but advanced cryptographic security is not required. The block-level locking allows flexible data protection where some blocks can remain writable while others are permanently locked.

FAQ

What is the memory difference between ST25TV512 and Tag-it HF-I Plus?

The ST25TV512 has 64 bytes (512 bits) of user memory, while the Tag-it HF-I Plus has 256 bytes (2048 bits) of user memory organized in 64 blocks. The Tag-it HF-I Plus provides four times more storage capacity.

Which chip has better security features for anti-counterfeiting?

The ST25TV512 offers superior anti-counterfeiting security with TruST25 digital signature, password encryption, tamper detection, and privacy modes (Kill and Untraceable). The Tag-it HF-I Plus only provides individual block locking and a locked unique UID without cryptographic authentication.

Are both chips compatible with ISO 15693 readers?

Yes, both the ST25TV512 and Tag-it HF-I Plus support ISO/IEC 15693 protocol at 13.56 MHz. The Tag-it HF-I Plus additionally supports ISO/IEC 18000-3, while the ST25TV512 also supports NFC Forum Type 5.

Sourcing ST25TV512 or Tag-it HF-I Plus in volume?

Roxtron builds custom RFID and NFC products around both ST25TV512 and Tag-it HF-I Plus. Tell us your project — quantities, form factor, timeline — and we'll come back within 24 hours with pricing and lead times.