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S50 card main indicators and typical applications in the market

The contactless smart card made by NXP MF1 IC S50, usually referred to as S50 card or Mifare 1K, complies with ISO14443A standard, 4 or 7 bytes UID, 1K data storage area, and the data is protected by key.

     Main indicators are introduced.

Product name: Mifare 1K (S50) card   

Chip type: NXP Mifare 1 IC S50

Storage capacity: 1K Bytes

Operating frequency: 13.56 MHz

Communication rate: 106Kbps

Read and write distance: 0 ~ 100mm

Read and write time: 1 ~ 5ms

Operating temperature: -20℃ ~ +55℃

Erase life: >100,000 times

Data retention: >10 years

Dimension: ISO standard card 85.6x54x0.82

Encapsulation material: PVC, PET, PETG, 0.13mm copper wire

Encapsulation process: Ultrasonic automatic wire implantation / automatic touch welding

Implementation standard: ISO14443A

Available size: 85.6×54, 83×20, 70×40, 50×50, 45×45, 45×28, 44×20, 38×38, 35×30

    S50 card working principle.

The electrical part of the card consists of only one antenna and ASIC.


Antenna: The antenna of the card is a coil with only a few sets of windings, which is well suited to be encapsulated into an IS0 card.


The cards ASIC consists of a high-speed (106KB baud rate) RF interface, a control unit and an 8K-bit EEPROM.

    Operating principle.

The reader sends a set of fixed frequency electromagnetic waves to the M1 card, and there is an LC series resonant circuit inside the card, whose frequency is the same as the frequency emitted by the interrogator. Under the excitation of the electromagnetic waves, the LC resonant circuit resonates, which results in a charge inside the capacitor, and at the other end of this capacitor, there is a single-wire electronic pump connected, which sends the charge inside the capacitor to another capacitor for storage, and when the accumulated charge reaches When the accumulated charge reaches 2V, this capacitor can be used as a power supply to provide working voltage for other circuits to transmit out the data in the card or pick up the data from the reader.

    Typical applications.

Access control, time and attendance, conference check-in, identification, logistics, industrial automation, various membership cards, such as meal sales, subway, bus token cards, clubs and other electronic consumption, electronic tickets, animal identification, target tracking, laundry management, various one-card, etc.

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