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LF 125 kHzNXP

HITAG 2

NXP HITAG 2 is an RFID tag IC, operating at 125 kHz, supporting Proprietary HITAG 2 protocol (not ISO/IEC 14443 or 15693). Emulation modes: Public Mode A (MIRO/µEM H400x compatible, Manchester), Public Mode B (ISO 11784/11785 animal ID, Biphase), Public Mode C (PIT compatible, Biphase), with 256 bits total (32 bytes) organized in 8 pages of 4 bytes each. 128 bits (16 bytes) user data in pages 4-7; 128 bits control/secret memory in pages 0-3. Serial Number: 32 bits. Secret Key: 48 bits. Password TAG: 24 bits. Password RWD: 32 bits..

125 kHz read/write transponder with 256-bit EEPROM, password and HITAG 2 crypto modes.

Source document ↗
Frequency
125 kHz
Protocol
Proprietary HITAG 2 protocol (not ISO/IEC 14443 or 15693). Emulation modes: Public Mode A (MIRO/µEM H400x compatible, Manchester), Public Mode B (ISO 11784/11785 animal ID, Biphase), Public Mode C (PIT compatible, Biphase)
Memory
256 bits total (32 bytes) organized in 8 pages of 4 bytes each. 128 bits (16 bytes) user data in pages 4-7; 128 bits control/secret memory in pages 0-3. Serial Number: 32 bits. Secret Key: 48 bits. Password TAG: 24 bits. Password RWD: 32 bits.
Interface
RF contactless only (no battery, passive). Data transmission: half-duplex. Tag to reader: 4.0 kbit/s Manchester or Biphase coding. Reader to tag: 5.2 kbit/s BPLM (binary pulse length modulation). Modulation: ASK (amplitude shift keying). Absorption modulation from tag to reader.
Temp Range
-40°C to +85°C operating, -55°C to +125°C storage
Form Factor
HT2 DC20 S20/F: Stick transponder, 12 x 6 x 3 mm, epoxy resin encapsulated (black), IP67 rated

Full Specifications

ManufacturerNXP
Frequency CategoryLF 125 kHz
Frequency125 kHz
ProtocolProprietary HITAG 2 protocol (not ISO/IEC 14443 or 15693). Emulation modes: Public Mode A (MIRO/µEM H400x compatible, Manchester), Public Mode B (ISO 11784/11785 animal ID, Biphase), Public Mode C (PIT compatible, Biphase)
Memory256 bits total (32 bytes) organized in 8 pages of 4 bytes each. 128 bits (16 bytes) user data in pages 4-7; 128 bits control/secret memory in pages 0-3. Serial Number: 32 bits. Secret Key: 48 bits. Password TAG: 24 bits. Password RWD: 32 bits.
InterfaceRF contactless only (no battery, passive). Data transmission: half-duplex. Tag to reader: 4.0 kbit/s Manchester or Biphase coding. Reader to tag: 5.2 kbit/s BPLM (binary pulse length modulation). Modulation: ASK (amplitude shift keying). Absorption modulation from tag to reader.
Temperature Range-40°C to +85°C operating, -55°C to +125°C storage
Form FactorHT2 DC20 S20/F: Stick transponder, 12 x 6 x 3 mm, epoxy resin encapsulated (black), IP67 rated
SecurityMutual authentication with proprietary 48-bit crypto stream cipher. Password mode (32-bit Password RWD, 24-bit Password TAG). Crypto mode (48-bit secret key, encrypted data transmission). Selective read/write protection per page via configuration byte. One-time programmable (OTP) lock bits for pages 1, 2, 3 (Bit 6 and Bit 7 in configuration byte). User-defined write protection. Authentication duration: ~36 ms.

Engineering Brief

HITAG 2 provides 128 bits of user data and 128 bits of control or secret memory. It supports password and crypto modes plus configurable public read-only modes. Its proprietary cryptography is distinct from MIFARE Classic Crypto1. Protocol support alone does not establish suitability for a new security system; evaluate the complete threat model.

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