EM4100 125kHz Printable RFID Card

The EM4100 125kHz Printable RFID Card is a compact, passive RFID transponder designed for compatible low-frequency RFID systems. It uses contactless communication and obtains operating power from the magnetic field generated by an RFID reader, so no battery is required.

The card uses a 125kHz operating frequency and provides a sensing distance of approximately 1–5 cm, depending on the reader, antenna size, and installation environment. Its standard PVC card construction makes it convenient for identification cards, access-control badges, attendance systems, and other proximity applications.

The blank printable surface can be customized using compatible ID card printing equipment. The card can also be incorporated into electronics and RFID development projects using suitable 125kHz readers.

Features

• Passive contactless RFID operation
• No internal battery required
• 125kHz low-frequency operation
• Approximately 1–5cm operating distance depending on antenna geometry
• T5577 / EM4100-compatible transponder core
• Printable blank PVC surface
• 330-bit EEPROM capacity
• Fast response time specified at less than 67ms
• More than 100,000 rewrite cycles according to supplied specifications
• Standard card-size form factor
• Suitable for compatible 125kHz RFID readers

Applications

• Door and access-control systems
• Employee identification
• Attendance systems
• Membership identification
• Parking access systems
• Event identification
• Hotel and facility access applications
• RFID educational projects
• Arduino and microcontroller RFID projects
• DIY proximity identification systems

How It Works

The EM4100 125kHz RFID card is a passive transponder. When it is brought within the operating range of a compatible RFID reader, the reader generates an electromagnetic field that supplies energy to the card's internal circuitry.

The card then communicates its stored identification data back to the reader using the 125kHz RFID interface. Because the card is passive, it does not require a battery or separate power connection.

For customized identification applications, the blank PVC surface can be printed with suitable card-printing equipment.

Compatibility

This card is designed for 125kHz RFID systems. It should be used with compatible low-frequency RFID readers and access-control equipment.

It is not a 13.56MHz NFC/MIFARE card and should not be expected to work with readers designed specifically for 13.56MHz cards, including common MIFARE/NFC readers such as the RC522.

Important Notes

• This card operates at 125kHz.
• It is not compatible with 13.56MHz NFC or MIFARE readers.
• Actual reading distance depends on the reader, antenna geometry, installation environment, and card orientation.
• Do not bend, puncture, or damage the card because the internal antenna may be damaged.
• Avoid punching holes through areas containing the internal antenna coil.
• Ensure the selected RFID reader supports the card's frequency and transponder format.
• Printing compatibility depends on the specific card printer and printing method.
• Please allow up to 5% physical dimension deviation due to manual measurement.
• Product images are illustrative and may differ from the actual product.
• Product specifications may vary slightly between production versions.

Package Includes

• 1 × EM4100 125kHz Printable RFID Card (Blank White PVC Surface)