Skip to main content

HF RFID tag, 13.56 MHz, for metal and non-metal surfaces, Tag-Icode-4921

GTIN: 5906935200834 · SKU: Tag-Icode-4921

The Tag-Icode-4921 is a high-frequency 13.56 MHz RFID tag that performs well in asset tracking, production process automation, security management, NFC applications and waste management. Thanks to its compact size (49 × 21 mm) and solid material, the tag suits both metal and non-metal surfaces, with a reading range of up to 8 cm on metal and up to 5 cm off metal. Its durable construction and IP68 rating make it resistant to dust, water and extreme temperatures, so it is an ideal choice for demanding industrial conditions.

Black HF RFID tag Tag-Icode-4921 with two mounting holes

Table of contents​

Specifications​

  • Colour: black
  • Material: FR4 (PCB)
  • Operating frequency: 13.56 MHz
  • Reading distance: up to 5 cm off metal, up to 8 cm on metal
  • IC type: NXP I-CODE SLI-X
  • Memory: 1024 bit
  • Write cycles: 100,000
  • Data retention: up to 50 years
  • Dimensions: 49 × 21 × 3 mm
  • Mounting holes: 2 × 3 mm
  • Weight: 6.5 g
  • Operating temperature: −40°C – +100°C
  • Storage temperature: −40°C – +150°C
  • Protection rating: IP68
  • Certificates: CE, RoHS

Kit contents​

  • Tag-Icode-4921 HF RFID tag — 1 pc.

General instructions​

Before using the RFID tags for the first time, read this manual carefully to make sure they have been installed and configured correctly.

RFID tag usage rules​

The Tag-Icode-4921 is a specialised tag — designed to work in harsh conditions, e.g. more resistant to high temperatures, shocks or water. Fasten it through the two mounting holes; the tag works on metal and non-metal surfaces and reaches its longest reading range (up to 8 cm) on metal.

Protection against damage​

  • RFID tags are passive devices and need no power supply. Protect them against mechanical damage to keep them reliable.
  • Use specialised tags as intended and in suitable conditions to ensure they work correctly.

Protection against interference​

  • Electromagnetic interference: RFID tags can be susceptible to electromagnetic interference, so do not store or use them near strong sources of interference, such as electronic devices that generate strong electromagnetic fields.
  • Reading data: to ensure optimal reading, store the tags so that nothing blocks the radio signal — for example, do not store them in metal containers that can interfere with the signal.

Maintenance and cleaning​

Store and operate specialised tags in line with the manufacturer's recommendations for use in harsh conditions.

Storage​

  • If the RFID tags will not be used for a long time, store them in a dry, cool place, away from strong electromagnetic fields.
  • Avoid storing the tags in places with extreme temperatures or humidity, or where they may be mechanically damaged, e.g. crushed.

Following these rules helps keep RFID tags safe to use and increases their durability and reliability.

Frequently asked questions​

What is the difference between reading range on metal and off metal?
The Tag-Icode-4921 is an on-metal RFID tag — its design includes a special substrate that makes it work better when mounted on metal surfaces (up to 8 cm range) compared to non-metal surfaces (up to 5 cm range). Standard RFID tags typically fail completely on metal due to signal interference, whereas this tag is specifically engineered to counteract that effect.
Is the Icode-4921 compatible with NFC smartphones?
Yes. The tag operates at 13.56 MHz and supports the ISO 15693 standard used by NXP I-CODE SLI-X chips. Most modern smartphones with NFC support ISO 15693 reading, making it possible to scan the tag with a phone. However, the effective range with a phone may be shorter than with a dedicated RFID reader.
Can the tag be reused after writing data?
Yes. The tag supports up to 100,000 write cycles, making it fully reusable. Data is retained for up to 50 years without power, so the tag is well-suited for long-term asset labelling applications.

Downloads​

The manuals and datasheets as PDF, in case an offline copy is needed. Everything in them is also on this page.