h1>Product Overview
The DO RFID Reader MIFARE Classic 4K (S70) 13.56MHz Blank RFID Printable Card is a high-capacity contactless smart card designed for industrial access control, public transit ticketing, loyalty programs, and secure identification deployments. Built around the NXP MIFARE Classic 4K chip, this card delivers 4096 bytes of user memory across 40 sectors, providing ample storage for complex multi-application environments. System integrators, project contractors, and distributors choose this card for its proven compatibility with ISO/IEC 14443-A infrastructure, including widely deployed readers such as the ACR122U. The blank PVC construction allows on-demand printing using dye-sublimation or thermal transfer printers, making it a practical choice for organizations that need to issue customized credentials in batches. Whether you are deploying a large-scale access control system for a commercial campus or managing a transit fare collection project, this card offers the memory capacity, encryption security, and physical durability required for long-term operational use.
Key Features
- Ample User Memory: 4096 bytes organized into 40 sectors (32 sectors of 4 blocks and 8 sectors of 16 blocks) support multi-application data storage, including biometric templates, event logs, and value-based transactions.
- CRYPTO1 Encryption: Hardware-based authentication and data encryption protect against unauthorized access, cloning, and relay attacks, meeting the security requirements of commercial access control and payment systems.
- ISO/IEC 14443-A Compliance: Guarantees interoperability with standard 13.56 MHz readers and NFC-enabled terminals used in building security, parking management, and employee identification.
- 4-Byte UID: Factory-programmed unique identifier enables straightforward card-to-person binding without additional encoding steps during deployment.
- Durable PVC Construction: Waterproof and tear-resistant material withstands daily handling in office environments, industrial facilities, and outdoor turnstile applications.
- Print-Ready Surface: Blank PVC surface accepts dye-sublimation and thermal transfer printing from printers such as Zebra, Epson, and Canon, allowing variable data, logos, and serial numbers to be applied at the point of issuance.
- Standard CR80 Form Factor: 85.6 mm x 54 mm x 0.8 mm dimensions fit standard ID card holders, badge reels, and direct card readers without modification.
Technical Specifications
| Operating Frequency | 13.56 MHz |
| Chip Type | NXP MIFARE Classic 4K (S70) |
| User Memory | 4096 Bytes (40 sectors: 32 sectors × 4 blocks, 8 sectors × 16 blocks) |
| UID Size | 4 Bytes |
| Read Range | Up to 10 cm (dependent on reader antenna geometry and environment) |
| Data Transfer Rate | Up to 106 kbps |
| Communication Protocol | ISO/IEC 14443-A |
| Dimensions | 85.6 mm × 54 mm × 0.8 mm (CR80 / ISO standard) |
| Material | PVC |
| Factory Default Keys (A/B) | FF FF FF FF FF FF |
| Weight | 0.007 kg per card |
Industrial Applications
The DO RFID Reader MIFARE Classic 4K card is deployed across multiple commercial and institutional sectors where reliable contactless identification and data storage are required.
- Access Control: Used by security system integrators for employee badge issuance in office towers, manufacturing plants, data centers, and gated communities. The 4K memory allows segmentation of access zones, time schedules, and visitor permissions within a single card.
- Public Transportation Ticketing: Transit authorities and fare collection contractors utilize the card’s 40-sector memory to store trip counters, balance data, and route permissions. The CRYPTO1 encryption protects fare value against tampering.
- Loyalty and Membership Programs: Retail chains, gyms, and hospitality operators issue these cards as customer loyalty cards, storing points balances and member tier information directly on the chip for offline validation.
- Employee Identification Badges: Corporates and government agencies print employee photos and credentials onto the blank PVC face while encoding personnel data, department access levels, and emergency contact information in the chip memory.
- Cashless Payment and Vending: Cafeterias, canteens, and vending machine operators deploy the card for micropayments. The 4K sector structure supports multiple purses or value counters for different service points.
- Parking Management: Parking facility operators use the card for season pass holders, storing vehicle registration details, access validity, and payment history within the chip’s memory sectors.
- Event and Festival Access: Event organizers issue the cards as RFID wristbands or badges for attendee identification, cashless payments, and session tracking across multiple venues.
OEM / ODM Manufacturing Support
As a dedicated RFID card manufacturer, DO RFID Reader provides OEM and ODM services for organizations that require customized form factors, printed branding, or specialized chip encoding. Wholesale buyers and system integrators benefit from the following manufacturing capabilities:
- Custom Surface Printing: We apply full-color logos, employee photographs, barcodes, QR codes, and sequential numbering using industrial-grade dye-sublimation and thermal transfer printers. Artwork in common formats (AI, PDF, EPS) can be accommodated with minimal setup lead time.
- Variable Data Encoding: Each card can be pre-encoded with unique sector keys, UID-based application identifiers, or specific data structures required by your access control or payment software. This eliminates on-site programming labor during deployment.
- Custom UID Ranges: For projects requiring traceable serialization, we can program sequential or block-assigned UID ranges to match your database schema.
- Material Options: In addition to standard PVC, we can supply cards in composite materials or with added lamination layers for enhanced durability in outdoor or industrial environments.
- Packaging Customization: Bulk orders can be packaged in plain boxes, branded sleeves, or individual blister packs according to your distribution requirements.
- Sample Approval Process: We provide pre-production samples for functional and visual approval before full manufacturing runs, reducing the risk of specification mismatches.
Factory Production Advantages
DO RFID Reader operates a production facility equipped for high-volume card manufacturing with consistent quality and reliable lead times. Our manufacturing process supports both small-batch pilot projects and large-scale wholesale orders.
- Stable Production Capacity: Our factory line can produce tens of thousands of RFID cards per day, ensuring that project deadlines and distributor restock schedules are met without interruption.
- Batch Consistency: Each production run uses controlled raw material sourcing and in-line quality checks to maintain uniform card thickness, print registration, and chip performance across all units in an order.
- Fast Lead Times: Standard blank cards ship from stock within 2–5 business days. Custom-printed and encoded orders are typically completed within 10–15 working days, depending on volume and complexity.
- Quality Inspection: Every batch undergoes electrical testing for read/write functionality, dimensional checks, and print quality verification before dispatch. Defective units are rejected and replaced at no cost.
- Export Experience: We regularly ship to system integrators and distributors across multiple regions, with experience in customs documentation and international shipping standards.
- Long-Term Supply Agreements: For ongoing projects, we offer fixed pricing and reserved production slots, giving buyers confidence in cost stability and availability over multi-phase deployments.
Bulk Supply & Project Deployment Support
Wholesale buyers, project contractors, and system integrators require more than just a product—they need a supply partner who understands deployment timelines, system compatibility, and field support. DO RFID Reader supports large-scale deployments through the following commercial provisions:
- Tiered Bulk Pricing: Volume discounts are available at 200, 600, and 1000+ unit quantities, with additional price breaks for ongoing contract orders. Contact us for a customized quotation based on your annual volume.
- Compatibility Assurance: The MIFARE Classic 4K chip is widely supported by major reader brands and middleware platforms. We can provide technical documentation and sample cards for compatibility testing with your existing infrastructure before committing to a full order.
- Project Consultation: Our technical team can advise on sector allocation, key management best practices, and integration approaches for common access control and payment platforms, reducing deployment risk.
- Replacement Buffer Stock: For mission-critical installations, we can hold agreed buffer stock at our factory for immediate dispatch, ensuring that lost or damaged cards can be replaced within days rather than weeks.
- Distributor Cooperation: We welcome long-term distribution partnerships. Wholesale accounts receive priority production slots, dedicated account management, and marketing support including product datasheets and samples.
Compatibility & Integration Notes
The DO RFID Reader MIFARE Classic 4K card communicates using the ISO/IEC 14443-A standard at 13.56 MHz. It is compatible with:
- ACR122U and similar PC-linked NFC readers
- MIFARE-compatible access control panels and door readers
- NFC-enabled smartphones and tablets (with appropriate middleware)
- Any reader infrastructure supporting MIFARE Classic 4K memory mapping
The default authentication keys (FF FF FF FF FF FF) allow straightforward programming during initial development. For production deployments, we recommend changing sector keys to prevent unauthorized read/write access. Cards can be programmed using standard MIFARE SDKs, PC/SC-compatible tools, or custom firmware on embedded readers.
Frequently Asked Questions
What is the difference between MIFARE Classic 1K and MIFARE Classic 4K?
The MIFARE Classic 4K provides 4096 bytes of user memory across 40 sectors, compared to 1024 bytes across 16 sectors on the 1K variant. The 4K version also includes 8 sectors of 16 blocks each (larger block size) for applications requiring more data per sector, such as biometric templates or multi-application configurations.
Can I print on these cards with a standard ID card printer?
Yes. The blank PVC surface is compatible with dye-sublimation and thermal transfer printers from manufacturers such as Zebra, Epson, Canon, and Fargo. We recommend testing a sample with your specific printer model and ribbon type before bulk production.
How do I encode data to the card?
You can write data using any MIFARE-compatible reader/writer (such as ACR122U) together with software libraries like libnfc, MIFARE SDK, or custom PC/SC applications. The default keys are FF FF FF FF FF FF for both A and B sectors. For production deployments, sector keys should be changed.
What is the maximum read range?
The typical read range is up to 10 cm, but actual performance depends on the reader antenna design, surrounding materials (metal, liquids), and ambient RF noise. In clean environments with a standard proximity reader, 4–6 cm is a reliable working distance.
Do you offer custom encoding before shipping?
Yes. We can pre-program sector data, key structures, and application-specific information during manufacturing. This reduces on-site labor and ensures consistency across all cards in a deployment. Contact us with your data structure requirements for a feasibility assessment and lead time estimate.
What is the minimum order quantity for custom printing or encoding?
Custom printing and encoding are available from 200 pieces upward, with shorter lead times for larger quantities. For projects requiring fewer than 200 customized cards, we recommend using blank cards with on-site printing.
How should I store these cards before deployment?
Store cards in a cool, dry environment away from direct sunlight and strong electromagnetic fields. The PVC material remains stable in standard office conditions. For long-term storage, keep cards in their original packaging to prevent dust accumulation on the print surface.
Can I request samples for testing before placing a bulk order?
Yes. Sample cards are available for compatibility testing and print evaluation. Please contact us at info@dorfidreader.com with your testing requirements and delivery address. A nominal sample fee applies, which is deductible from your first bulk order.
Do you support long-term supply agreements for ongoing projects?
We offer annual supply contracts with fixed pricing, reserved production capacity, and scheduled deliveries. This is particularly suited for system integrators who deploy access control systems continuously and need predictable card supply. Contact our sales team to discuss volume commitments and contract terms.
What is the warranty on these cards?
We warrant that each card will be free from manufacturing defects in material and workmanship at the time of shipment. Cards that fail due to normal wear, physical damage, or improper programming are not covered. Please review our standard terms and conditions or contact us for specific warranty provisions applicable to your order.