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  "url": "https://proudtek.com/guides/icode-slix-chip-encyclopedia/",
  "sourceUrl": "https://proudtek.com/guides/icode-slix-chip-encyclopedia/",
  "title": "ICODE SLIX / SLIX2 — HF ISO 15693 Chip Technical Encyclopedia (Memory, EAS, Library Deployment)",
  "description": "This NXP HF Vicinity chip family (and its successor SLIX2) is the NXP HF 13.56 MHz chip optimized for ISO/IEC 15693 vicinity cards. Shipping since...",
  "kind": "article",
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  "imageAlt": "ICODE SLIX HF ISO 15693 card and library tag antenna layout",
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      "alt": "ICODE SLIX HF ISO 15693 card and library tag antenna layout"
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    {
      "name": "ICODE SLIX / SLIX2 — HF ISO 15693 Chip Technical Encyclopedia (Memory, EAS, Library Deployment)",
      "url": "https://proudtek.com/guides/icode-slix-chip-encyclopedia/"
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  ],
  "summary": [
    "This NXP HF Vicinity chip family (and its successor SLIX2) is the NXP HF 13.56 MHz chip optimized for ISO/IEC 15693 vicinity cards."
  ],
  "faq": [
    {
      "question": "What's the difference between ICODE SLIX and ICODE SLIX2?",
      "answer": "Memory and security. SLIX has 896 bits (112 bytes) of user memory and no password protection. SLIX2 has 2,528 bits (316 bytes) of user memory (in 79 × 4-byte blocks per NXP SL2S2602 datasheet; 2,560-bit total EEPROM including system block) plus 64-bit passwords for EAS, PRIVACY mode, and DESTROY. For most library deployments SLIX is sufficient. SLIX2 is the right choice when memory-constrained library schemas hit SLIX's 112-byte ceiling or when EAS/PRIVACY password protection is required by the library's threat model."
    },
    {
      "question": "Can an NFC phone read ICODE SLIX tags?",
      "answer": "Yes, as NFC Forum Type 5 tags. Android phones with NFC reader mode support ISO 15693 natively (since Android 4.4 Kit-Kat). iPhone supports ISO 15693 via Core NFC starting iOS 13. A SLIX tag formatted with NDEF records in NFC Type 5 layout responds to standard consumer NFC taps. Opening URLs, triggering Apple Shortcuts, launching apps. Note that the proprietary EAS and PRIVACY commands are NOT accessible to stock phone apps; only standard NFC reads/writes work."
    },
    {
      "question": "How far can an ICODE SLIX tag be read?",
      "answer": "Up to ~1.5 m with a large library-gate antenna (50 × 50 cm portal) and a typical book-inlay size tag (70 × 40 mm). Typical library gate deployment is 80-100 cm effective range on a 30 × 30 cm reader antenna. This long range is the main structural advantage over ISO 14443 (MIFARE), which is proximity-only (0-10 cm) due to its different air interface. ICODE SLIX's range comes at the cost of slower data rates and no crypto. It's a vicinity RFID, not a secure card."
    },
    {
      "question": "What is the EAS bit used for?",
      "answer": "Library anti-theft. The EAS (Electronic Article Surveillance) bit is a single hardware flag readable by the fast EAS Check command. Library staff set the bit on books currently on loan and reset it on checkout. Library gates continuously interrogate tags via EAS Check and alarm if any tag's EAS is still set when the book tries to leave the library. Because EAS Check is lightweight (no full memory read), gates process dozens of books in a patron's bag in parallel without slowing down traffic."
    },
    {
      "question": "Is ICODE SLIX suitable for access control?",
      "answer": "Not recommended for new deployments. ISO 15693 has no cryptographic authentication; SLIX2's 64-bit password is protection against casual tampering but not against determined attack. For access-control use cases, ISO 14443 with MIFARE Plus or DESFire EV3 is the standard choice; they operate at the same 13.56 MHz but with proper AES authentication. ICODE SLIX's strengths (long range, fast anti-collision, EAS) are tangential to access control."
    },
    {
      "question": "How many ICODE SLIX tags can be read in a single inventory scan?",
      "answer": "Typically 50-100 tags per 100 ms scan with a well-tuned reader, using the 16-slot anti-collision algorithm. For larger batches (500+ tags in a library tote), the reader performs multiple sequential scans and accumulates the UID list. Compared to UHF Gen2, ISO 15693's anti-collision is slower (higher read time per tag), but for the book-tag use case (50-item bag at gate) it is more than adequate."
    },
    {
      "question": "Can I use ICODE SLIX on metal surfaces or in water?",
      "answer": "Metal requires a ferrite-backed inlay, same as any HF tag. With a 0.3-1 mm ferrite spacer, SLIX works on metal with 2-5 dB sensitivity penalty. Water is generally fine. HF is robust through moisture (books returned in wet weather read correctly). For harsh conditions (industrial laundry autoclaves, chemical immersion), use the PPS-housing or silicone-encapsulated SLIX tag variants rather than paper-inlay book labels."
    }
  ],
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      "label": "Best for",
      "value": "ICODE SLIX / SLIX2 — HF ISO 15693 Chip Technical Encyclopedia (Memory, EAS, Library Deployment) supports RFID and NFC evaluation, comparison, and sourcing decisions."
    },
    {
      "label": "Compare first",
      "value": "Compare ICODE SLIX / SLIX2 — HF ISO 15693 Chip Technical Encyclopedia (Memory, EAS, Library Deployment) against reader compatibility, chip family, material, and deployment environment."
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      "label": "What to confirm",
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  "author": {
    "name": "Proud Tek Editorial Team",
    "title": "RFID & NFC Technical Content Team",
    "expertise": [
      "RFID manufacturing",
      "NFC technology",
      "Access control systems",
      "Smart card engineering"
    ]
  },
  "publisher": "Proud Tek Co., Limited",
  "datePublished": "2026-04-19",
  "dateModified": "2026-06-02T06:20:44Z",
  "lastReviewedDate": "2026-06-02T06:20:44Z",
  "credentials": [
    "ISO 9001:2015",
    "ISO 14001:2015",
    "RoHS Compliant",
    "CE Marking",
    "REACH Compliant"
  ],
  "generatedAt": "2026-03-16T01:42:30.697Z"
}