{"license":"Free for any use with attribution link to rfid-datasheet.com","citation":"RFID-Datasheet.com Chip Database — Roxtron","source":"https://rfid-datasheet.com/chip/hitag-1","methodology":"https://rfid-datasheet.com/methodology","data_notes":"Includes automated enrichment. Null means unknown; last_checked is link availability, not technical review. Manufacturer documents govern specifications.","generated_at":"2026-11-01T19:50:18.591Z","chip":{"id":"76109825-1a84-479b-b7e6-292856f3f4d9","slug":"hitag-1","name":"HITAG 1","manufacturer":"NXP","frequency_category":"LF 125 kHz","short_description":"2048-bit R/W with crypto, access control and immobilizers","manufacturer_url":"https://cdn.united-access.com/wp-content/uploads/2021/07/ht038531.pdf","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)","temp_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","use_cases":["access-control","automotive-immobilizer","asset-tracking"],"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.","enriched":true,"url_status":"ok","link_status":"invalid","last_checked":"2026-11-01T03:31:28.371+00:00","last_status_code":530,"last_content_type":"text/plain; charset=UTF-8","created_at":"2026-06-14T16:30:56.111445+00:00","manufacturer_id":"6daaf1cc-d0e6-40c7-aba0-a08b4c3493fe","chip_type":"tag_ic","dual_interface":false,"is_family_hub":false,"meta_description":"NXP HITAG 1: 125 kHz LF RFID transponder with 2048-bit EEPROM, 32-bit cryptographic authentication, and anticollision for access control and vehicle immobilizers.","faq":[{"a":"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.","q":"How much user memory does the HITAG 1 have?"},{"a":"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.","q":"What is the read range of the HITAG 1 transponder?"},{"a":"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.","q":"What security features does the HITAG 1 offer?"},{"a":"Yes, the HITAG 1 includes proprietary anticollision capability, allowing multiple tags to be read in the same RF field using its HITAG 1 protocol.","q":"Does the HITAG 1 support anticollision?"},{"a":"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.","q":"What is the difference between Standard and Advanced protocol modes on HITAG 1?"},{"a":"The HITAG 1 operates at 125 kHz in the low-frequency (LF) RFID band using inductive coupling for contactless communication.","q":"What frequency does the HITAG 1 operate on?"}],"standards":["iso-18000-2"],"alternatives":["3d5557e0-57db-43d5-81b6-19e1b2a93cab","6fbf8d09-eab5-4645-a4ff-d46e5193497f","a9e71908-817a-43b2-a0ce-0d180be72f27"],"no_direct_competitor":false,"long_form_html":null,"og_image_url":null,"canonical_url":"https://rfid-datasheet.com/chip/hitag-1"}}