{"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-2","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":"2026-11-01T19:50:36.632Z","chip":{"id":"de787ff0-5b24-47b3-b28b-3d404e2eda36","slug":"hitag-2","name":"HITAG 2","manufacturer":"NXP","frequency_category":"LF 125 kHz","short_description":"125 kHz read/write transponder with 256-bit EEPROM, password and HITAG 2 crypto modes.","manufacturer_url":"https://www.nxp.com/docs/en/data-sheet/HT2X_SDS.pdf","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","security":"Mutual 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.","use_cases":["automotive-immobilizer","access-control","animal-identification"],"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.","enriched":true,"url_status":"ok","link_status":"valid","last_checked":"2026-11-01T03:31:28.371+00:00","last_status_code":200,"last_content_type":"application/pdf","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 2 LF transponder: 256-bit EEPROM, 128-bit user data, password and crypto modes. Official HT2x short datasheet and selection notes.","faq":[],"standards":["iso-11784-11785"],"alternatives":["3d5557e0-57db-43d5-81b6-19e1b2a93cab","a9e71908-817a-43b2-a0ce-0d180be72f27","6fbf8d09-eab5-4645-a4ff-d46e5193497f"],"no_direct_competitor":false,"long_form_html":{},"og_image_url":null,"canonical_url":"https://rfid-datasheet.com/chip/hitag-2"}}