13.56mhz White blank contactless NXP Mifare classic 4k s70 RFID card

The 13.56MHz MIFARE Classic 4K S70 RFID Card is a blank contactless smart card designed for applications that require secure identification, access control, ticketing, membership management, and other HF RFID functions. Based on MIFARE Classic 4K technology and ISO/IEC 14443A communication, the card provides 4KB of memory for storing application data.

With a standard CR80 bank-card size, a white printable PVC surface, and contactless operation, this RFID card can be customized for a wide range of identification and smart-card applications. It is suitable for card printing, personalization, access badges, student cards, employee cards, membership cards, and other RFID projects.

13.56mhz Mifare classic 4k s70 card

The RFID technology used most frequently world wide comes from NXP Semiconductors and is named MIFARE Classic EV1. By now the MIFARE family consists of many different chip generations and variations, which differ in memory size and performance. Overall more than 5 milliard MIFARE Classic cards and more than 50 million card readers have been sold all around the world!

Solutions based on MIFARE Classic technology occur mostly in the area of personal ID-applications. From multifunctional employee or visitor badges (f.e.: access control, time tracking, cashless payment) to ticketing applications like season tickets and student cards at universities: MIFARE Classic RFID cards are tested and reliable!

The MIFARE Classic 4K platform is available in different implementations and chip generations. For projects that require a specific chip, memory configuration, or security architecture, customers should confirm the exact chip type and specifications before ordering.

Key Features

• 13.56MHz high-frequency RFID technology
• MIFARE Classic 4K / S70 memory configuration
• ISO/IEC 14443A contactless interface
• 4KB EEPROM memory
• Standard CR80 card dimensions
• White blank PVC surface for customized printing
• Contactless reading and writing
• Suitable for access control, identification, ticketing, membership, and other RFID applications
• Available for customized printing and packaging
• Compatible with suitable MIFARE Classic 4K readers and systems

The combination of contactless communication, memory capacity, and a standard card format makes the MIFARE Classic 4K S70 card a practical option for applications that need more storage than a typical 1KB MIFARE Classic card.

Typical applications with MIFARE Classic EV1 (Selection):

• Public transportation
• Access control / Time tracking
• Season ticket / Annual tickets / Ticketing
• Car parks
• Student cards
• Internet cafés
• Costumer cards / Bonus cards
• eGovernment
• Employee cards

Standard size: 85.5*54*0.86 mm
 RFID chip for hotel key card: NXP MIFARE Classic® 1K, NXP MIFARE Classic® 4K,NXP MIFARE Ultralight® EV1 etc

Chip Options

Remark:
MIFARE and MIFARE Classic are trademarks of NXP B.V.
MIFARE DESFire are registered trademarks of NXP B.V. and are used under license.
MIFARE and MIFARE Plus are registered trademarks of NXP B.V. and are used under license
MIFARE and MIFARE Ultralight are registered trademarks of NXP B.V. and are used under license.

What Is a MIFARE Classic 4K S70 Card?

MIFARE Classic 4K is a contactless smart-card technology operating at 13.56MHz. The “4K” designation refers to its approximately 4KB memory capacity, while S70 is commonly used to identify the MIFARE Classic 4K chip family.

Compared with smaller MIFARE Classic configurations, the 4K version provides additional memory that can be useful when an application needs to store multiple data areas or more information on a single card.

The card communicates wirelessly with a compatible reader. When the card enters the reader’s operating range, the reader can communicate with the chip without requiring physical electrical contacts.

MIFARE Classic cards use sector-based memory organization and authentication mechanisms. This makes them different from simple read-only RFID cards that only provide a fixed identifier.

MIFARE Classic 4K Memory Structure

A major advantage of the MIFARE Classic 4K configuration is its larger memory capacity compared with MIFARE Classic 1K.

The memory is organized into sectors and blocks. MIFARE Classic 4K uses 40 sectors in total. The first 32 sectors contain four blocks each, while the remaining eight sectors contain sixteen blocks each.

Each block contains 16 bytes. Sector trailer blocks contain authentication and access-control information, including Key A and Key B.

The actual amount of memory available for application data is lower than the total EEPROM capacity because some blocks are reserved for sector trailers and system information.

For developers and system integrators, understanding this memory structure is important when designing card data layouts or checking compatibility with an existing MIFARE Classic application.

MIFARE Classic 4K vs MIFARE Classic 1K

MIFARE Classic 1K and MIFARE Classic 4K use the same general MIFARE Classic family architecture, but they provide different memory capacities and sector organizations.

If the application only needs a small amount of stored information, a 1K card may be sufficient and can be a more economical option. If more memory is required, the 4K version provides greater capacity.

However, choosing a 4K card does not automatically make it compatible with a 1K-based system. The reader, application software, memory layout, and authentication configuration must all support the selected card type.

MIFARE Classic 4K vs Other 13.56MHz RFID Cards

Not every 13.56MHz RFID card works in the same way. Different chip families use different memory structures, communication features, and security architectures.

This comparison is intended as a general guide. Card technologies should not be selected by frequency or memory capacity alone. The card must match the protocol, authentication method, reader, software, and security requirements of the application.

MIFARE Classic 4K and NFC Compatibility

MIFARE Classic cards operate at 13.56MHz and use ISO/IEC 14443A communication. However, “13.56MHz” does not mean that every NFC-enabled device or RFID reader will support every MIFARE Classic function.

Some NFC devices can detect or communicate with MIFARE Classic cards, while full memory access may depend on the device’s hardware, software, operating system, and available MIFARE Classic support.

For commercial systems, dedicated compatible RFID readers are normally the safest choice. Before purchasing, verify the exact reader model and confirm that it supports MIFARE Classic 4K.

Printable White PVC RFID Card

The card is supplied with a white PVC surface that can be personalized with logos, photographs, employee information, serial numbers, barcodes, QR codes, or other visual elements.

The standard CR80 format is similar to the size of a conventional bank card, making it convenient for wallets, card holders, access badges, and ID-card systems.

Customized printing can be used to create professional cards for organizations, schools, hotels, clubs, transportation systems, and businesses.

Typical personalization options may include:

• Full-color artwork
• Company or organization logos
• Employee photographs
• Names and identification numbers
• Barcodes and QR codes
• Serial numbers
• Custom backgrounds and branding
• Customized packaging

Printing requirements should be discussed before production, particularly when the card will be used with automatic card printers or other personalization equipment.

Applications of MIFARE Classic 4K RFID Cards

MIFARE Classic 4K cards can be used in a variety of identification and data-storage applications when the card technology is supported by the relevant system.

Access Control

The card can be used as an identification credential in compatible access-control systems. A reader communicates with the card wirelessly and the system determines whether the credential is authorized.

Applications can include office buildings, schools, factories, residential facilities, clubs, and controlled areas.

Employee Identification and Time Attendance

Organizations can combine printed employee information with RFID functionality. Employees can use contactless cards for identification, attendance recording, or access to designated areas.

Student and Campus Cards

Universities and schools can use RFID smart cards for student identification, library services, access control, campus facilities, and other applications where supported by the campus system.

Membership and Loyalty Cards

Retailers, gyms, clubs, and organizations can personalize the cards with customer information and use the RFID functionality for identification or membership services.

Ticketing and Transportation

MIFARE technology has been used in various ticketing and transportation environments. The suitability of a MIFARE Classic 4K card depends on the specific ticketing system and its security and data requirements.

Parking Systems

Compatible parking systems can use contactless cards as user credentials or account identifiers. The exact implementation depends on the parking system’s reader and software.

Hotel and Hospitality Applications

RFID cards are widely used in hospitality environments for identification and access-related applications. Whether MIFARE Classic 4K is appropriate depends on the hotel lock system and its supported card technology.

Why Choose a 4K RFID Card?

The main reason to choose a MIFARE Classic 4K card instead of a lower-capacity card is its larger memory space.

A 4KB configuration can provide more sectors for application data and allow a system designer to organize information across multiple areas of the card.

For example, a card-based system may need separate data areas for identification, access permissions, transaction information, or service-related records.

However, more memory is not always necessary. If the application only requires a simple identifier or a small amount of information, a smaller RFID or NFC chip may provide a better fit.

The correct card should therefore be selected according to the actual system architecture rather than memory capacity alone.

How to Choose the Right RFID Card

Before ordering MIFARE Classic 4K cards, check the following requirements:

If the cards are intended to replace an existing card, provide the supplier with the existing card technology and reader requirements where possible. This helps prevent ordering a card with the correct frequency but an incompatible chip architecture.

MIFARE Classic 4K Card Personalization

Blank RFID cards can be personalized in two different aspects: visual personalization and electronic personalization.

Visual personalization refers to printing information onto the card surface. Electronic personalization refers to writing application data to supported memory areas of the RFID chip.

These two functions are independent. A card can have customized artwork while its electronic memory remains blank, or it can be electronically personalized while carrying simple printed artwork.

For commercial projects, card printing and chip encoding should be planned together to ensure that the printed card number corresponds correctly with the electronic card data.

Ordering Samples Before Mass Production

For RFID projects, sample testing is recommended before ordering a large quantity.

A sample should be tested with the actual RFID reader, software, card printer, and intended application. This is particularly important for replacement cards, because compatibility depends on more than the operating frequency.

Recommended checks include:

1. Confirm the chip type.
2. Test the card with the intended reader.
3. Verify card detection and communication.
4. Confirm the required memory areas can be accessed by the application.
5. Test the authentication and access configuration.
6. Check card printing quality.
7. Confirm card dimensions and thickness.
8. Test the final card in the actual operating environment.

Testing a small sample quantity can reduce the risk of incompatibility during mass production.

Standard Card Size and Construction

The standard card size is approximately 85.5 × 54 mm, with a thickness of approximately 0.86 mm according to the product specification.

This CR80-style format is suitable for standard card holders and many professional card-printing workflows.

The RFID antenna and chip are embedded inside the card body, allowing the card to be used without exposed electrical contacts.

The white surface also provides a neutral base for logos, branding, photographs, identification information, and other printed elements.

Packaging and Delivery

The standard packaging option is described as 200 RFID cards per white box, with multiple boxes packed into a carton.

Customized packaging may also be available depending on project requirements.

For large orders, customers can discuss packaging quantities, labeling, artwork, carton configuration, and other logistics requirements with the supplier before production.

Normal package :
200pcs rfid cards  into white box .
5 boxes /10boxes /15boxes into one carton.
Customized Package based on your request.

Frequently Asked Questions

What frequency does the MIFARE Classic 4K card use?

The MIFARE Classic 4K S70 card operates at 13.56MHz and uses the ISO/IEC 14443A contactless communication standard.

How much memory does a MIFARE Classic 4K card have?

The MIFARE Classic 4K configuration provides approximately 4KB of EEPROM memory. Because part of the memory is used for system and security information, the entire 4KB is not available as general-purpose user data.

What is S70?

S70 is commonly used to identify the MIFARE Classic 4K chip configuration. It distinguishes the larger-memory version from the MIFARE Classic 1K configuration, commonly associated with S50.

Is MIFARE Classic 4K the same as MIFARE DESFire 4K?

No. MIFARE Classic 4K and MIFARE DESFire products are different smart-card technologies with different architectures and security features. A reader designed for one technology should not automatically be assumed to support the other.

Can MIFARE Classic 4K replace any 13.56MHz RFID card?

No. Operating at the same frequency does not guarantee compatibility. The card protocol, chip family, memory organization, authentication, reader, and software must be compatible.

Can the card be printed?

Yes. The white PVC surface is designed for card personalization and can be customized with suitable card-printing processes. Printing requirements should be confirmed based on the intended printer and card specification.

Is the card suitable for access control?

It can be suitable for compatible MIFARE Classic 4K access-control systems. The complete access-control system must support the card’s chip technology and authentication configuration.

Can I use it with an NFC phone?

Compatibility varies by phone hardware, operating system, and application. A phone supporting NFC does not necessarily provide full MIFARE Classic functionality. For reliable commercial deployment, test the exact device and application before implementation.

Should I choose MIFARE Classic 1K or 4K?

Choose MIFARE Classic 4K when the application requires more memory or a specific 4K card configuration. If the application needs only a small amount of data, MIFARE Classic 1K may be sufficient. The reader and existing system requirements should always be checked first.

MIFARE Classic 4K RFID Card for Custom Projects

This 13.56MHz MIFARE Classic 4K S70 RFID card combines a standard contactless smart-card format with 4KB memory and a printable white PVC surface. It can be considered for identification, access control, employee cards, student cards, membership programs, ticketing, parking, and other compatible RFID applications.

For projects requiring custom printing, electronic personalization, or bulk production, it is recommended to define the complete card specification before manufacturing. Important details include chip type, memory capacity, communication standard, card dimensions, printing requirements, encoding requirements, packaging, and quantity.

If you are replacing an existing RFID card, testing compatibility with the actual reader and application is especially important. A sample evaluation can help confirm that the selected MIFARE Classic 4K card meets the technical requirements before mass production.

Product Summary

The 13.56MHz MIFARE Classic 4K S70 RFID Card is a standard-size blank contactless PVC smart card designed for RFID identification and data-storage applications. Its key characteristics include 13.56MHz operation, ISO/IEC 14443A communication, approximately 4KB EEPROM memory, 40-sector memory organization, and a printable white card surface.

With appropriate system support, it can be used for access control, employee identification, student cards, membership cards, ticketing, parking, and other contactless RFID applications.

For the best results, select the card according to the requirements of the complete RFID system rather than frequency alone. Confirming the exact chip, reader compatibility, memory structure, security requirements, and personalization process before production is recommended.

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