HITAG 1
The NXP HITAG 1 is an LF 125 kHz RFID tag IC, with 2048 bits (2 KBit) total / 224 bytes user read/write memory / 32-bit read-only serial number, operating at 125 kHz, under HITAG 1 proprietary protocol, Manchester/AC coding Pulse Duration modulation.
2048-bit R/W with crypto, access control and immobilizers
Full Specifications
| Manufacturer | NXP |
|---|---|
| Frequency Category | LF 125 kHz |
| Frequency | 125 kHz |
| Protocol | HITAG 1 proprietary protocol, Manchester/AC coding, Pulse Duration modulation |
| Memory | 2048 bits (2 KBit) total / 224 bytes user read/write memory / 32-bit read-only serial number |
| Interface | RF (contactless inductive coupling) |
| Temperature Range | Not specified in datasheet |
| Form Factor | ASIC HT1 ICS30 02x with coil (passive transponder) |
| Security | Encryption, mutual authentication, passwords, two 32-bit cryptographic keys (Key A, Key B), four 32-bit logdata values |
Engineering Brief
The HITAG 1 is a 125 kHz passive LF transponder with 2 Kbit EEPROM memory organized in 64 pages, supporting both proximity (~200 mm) and long-range (~1000 mm) operation. It features a proprietary protocol with anticollision capability, cryptographic authentication using 32-bit keys and logdata, and configurable memory access controls (read/write, read-only, secret/public areas). Standard and Advanced protocol modes are supported, with the Advanced mode providing enhanced CRC protection on tag-to-reader transmissions.
Typical Applications
Standards & Compliance
Frequently Asked Questions
How much user memory does the HITAG 1 have?
The HITAG 1 provides 224 bytes of user read/write memory out of a total 2048-bit (256-byte) EEPROM. It also includes a 32-bit read-only serial number for unique identification.
What is the read range of the HITAG 1 transponder?
The HITAG 1 supports proximity operation up to approximately 200 mm and long-range operation up to approximately 1000 mm, depending on antenna design and reader power.
What security features does the HITAG 1 offer?
The HITAG 1 features mutual authentication with two 32-bit cryptographic keys (Key A and Key B), four 32-bit logdata values, password protection, and configurable memory access controls including read/write, read-only, and secret/public areas.
Does the HITAG 1 support anticollision?
Yes, the HITAG 1 includes proprietary anticollision capability, allowing multiple tags to be read in the same RF field using its HITAG 1 protocol.
What is the difference between Standard and Advanced protocol modes on HITAG 1?
Advanced protocol mode provides enhanced CRC (cyclic redundancy check) protection on tag-to-reader transmissions for improved data integrity, while Standard mode offers basic communication. Both modes operate at 125 kHz using Manchester/AC coding.
What frequency does the HITAG 1 operate on?
The HITAG 1 operates at 125 kHz in the low-frequency (LF) RFID band using inductive coupling for contactless communication.
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