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RFID Tag - EM4100 125khz RFID Key Fob

SKU: LLAPISNS5H
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The RFID Tag – EM4100 125kHz RFID Key Fob is a compact, passive, low-frequency RFID identification tag designed for contactless identification, access control, attendance systems, security systems, and asset identification applications. The key fob uses the EM4100 protocol or a compatible chip implementation and operates at a frequency of 125kHz. EM4100-family transponders are read-only devices that transmit a factory-programmed identification...
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The RFID Tag – EM4100 125kHz RFID Key Fob is a compact, passive, low-frequency RFID identification tag designed for contactless identification, access control, attendance systems, security systems, and asset identification applications. The key fob uses the EM4100 protocol or a compatible chip implementation and operates at a frequency of 125kHz. EM4100-family transponders are read-only devices that transmit a factory-programmed identification code when energized by a compatible RFID reader.

The RFID key fob contains an internal RFID chip and antenna coil enclosed inside a durable plastic housing. It does not require a battery or external power supply. When the key fob is brought near a compatible 125kHz RFID reader, it receives energy from the reader's electromagnetic field and transmits its stored identification data back to the reader.

Its compact keychain-style design makes it convenient to carry and suitable for everyday identification applications. The tag is commonly used with compatible 125kHz RFID readers such as RDM6300-type reader modules and other access-control readers that support the EM4100/EM4102 protocol family.

Key Features

  • Operates at 125kHz low frequency
  • EM4100 protocol compatible
  • Passive RFID technology
  • No battery or external power required
  • Factory-programmed unique identification code
  • Read-only RFID operation
  • Compact key fob design
  • Lightweight and easy to carry
  • Built-in antenna coil
  • Contactless identification
  • Fast and convenient scanning
  • Durable plastic enclosure
  • Suitable for keychain attachment
  • Compatible with many 125kHz RFID readers
  • Ideal for access control and attendance systems
  • Suitable for educational RFID projects

Shipping & Returns

Orders placed before 3 PM IST will be shipped on the same day (excluding Sundays and Public holidays) through our shipping partners. In rare cases, the pickup may get delayed during Public holidays / Bandh / Environmental disturbances.

Specifications

Specifications:

Tag Type: Passive RFID Key Fob
RFID Technology: Low-Frequency RFID
Protocol / Chip Family: EM4100 / EM4102 Compatible
Operating Frequency: 125kHz
Memory Type: Read-Only
Data Frame Length: 64 Bits Including Header, Data, Parity and Stop Bits
User Identification Data: 40 Data Bits within the EM4100 Frame Structure
Power Source: Passive / Reader Field Powered
Internal Battery: No
Communication Method: Inductive Coupling
Data Transmission: Reader-to-Tag Electromagnetic Coupling and Tag Load Modulation
Encoding Support: Device Variant Dependent
Reading Distance: Typically a Few Centimetres; Reader and Antenna Dependent
Read/Write Capability: Read Only
Reprogrammable: No, for standard EM4100 tags
Anti-Collision Support: No
Form Factor: Key Fob / Keychain Tag
Housing Material: ABS or Similar Plastic, depending on manufacturer
Typical Dimensions: Approximately 35mm × 28mm × 5mm, depending on housing design
Typical Weight: Approximately 5g to 7g, depending on variant
Color: Module Variant Dependent
Compatibility: EM4100/EM4102-Compatible 125kHz RFID Readers and Access Control Systems

Additional Resources

RFID Tag.PDF

FAQ

1. What is the EM4100 125kHz RFID Key Fob used for?

The RFID key fob is used for contactless identification in applications such as door access control, attendance systems, electronic locks, membership systems, parking access, and RFID-based security projects.

2. Does the EM4100 RFID Key Fob require a battery?

No. The key fob is a passive RFID tag. It receives the energy required for operation from the electromagnetic field generated by a compatible 125kHz RFID reader.

3. Can the EM4100 RFID Key Fob be rewritten or reprogrammed?

No. Standard EM4100 RFID tags are read-only devices with a factory-programmed identification code. The stored identification data cannot normally be changed or rewritten.

4. Is the EM4100 RFID Key Fob compatible with the RC522 RFID reader?

No. The EM4100 key fob operates at 125kHz, while the RC522 reader operates at 13.56MHz. The two systems use different frequencies and communication technologies and are not compatible.

5. What is the typical reading distance of an EM4100 RFID Key Fob?

The reading distance is typically a few centimetres, but the actual range depends on the reader antenna, reader power, tag orientation, antenna coupling, and surrounding environmental conditions.