h1>Product Overview
The MIFARE Classic 4K (S70) 13.56MHz Blank RFID Printable Card from DO RFID Reader is a high-capacity contactless smart card designed for secure identification, access control, and data storage applications. Built around the NXP MIFARE Classic 4K chip, this card offers 4096 bytes of user memory across 40 sectors, making it one of the most widely adopted HF RFID cards in commercial and industrial environments. System integrators, security contractors, and facility managers choose this card when they need reliable read performance, broad compatibility with existing 13.56 MHz infrastructure, and a durable PVC format that supports direct printing for custom badging. As a factory-direct supply from do rfid reader manufacturer, this card supports bulk procurement for large-scale deployments, OEM customization for branded access solutions, and consistent batch quality for long-term projects.
Product Advantages
Buyers and technical teams require RFID cards that integrate smoothly into existing systems without unexpected failures or compatibility gaps. The MIFARE Classic 4K card delivers exactly that. Its ISO/IEC 14443-A compliance ensures interoperability with the majority of HF readers, terminals, and NFC-enabled devices already deployed in the field. The large 4K memory allocation allows developers to store application data, biometric templates, transaction records, and access credentials on a single card, reducing the need for multiple credentials. For distributors and wholesalers, the standard CR80 form factor and PVC construction mean fast turnaround on custom printing, reliable encoding consistency, and reduced return rates due to format incompatibility. These commercial advantages make the card a logical choice for projects requiring volume supply, predictable lead times, and stable technical performance across multiple deployment sites.
Key Features
- High Memory Capacity: 4096 bytes user memory across 40 sectors (32 sectors of 4 blocks and 8 sectors of 16 blocks) enables complex data storage for multi-application credentials.
- Standard Compliance: ISO/IEC 14443-A communication protocol ensures compatibility with ACR122U readers, NFC-enabled smartphones, and most commercial HF reader terminals.
- Encrypted Data Transmission: CRYPTO1 encryption protects data exchange between card and reader, reducing risk of credential cloning or unauthorized access.
- Printable Surface: PVC material accepts dye-sublimation and thermal transfer printing using Zebra, Epson, Canon, and similar card printers for custom branding and photo ID.
- Durable Construction: Waterproof PVC withstands daily handling, wallet storage, and environmental exposure in industrial, commercial, and outdoor access points.
- Factory Default Keys: Pre-configured with A/B key FF FF FF FF FF FF for immediate programming and deployment.
- Wide Read Range: Up to 10 cm depending on reader antenna geometry, supporting convenient contactless interaction.
Technical Specifications
| Operating Frequency | 13.56 MHz |
| Chip Type | NXP MIFARE Classic 4K |
| User Memory | 4096 Bytes (40 sectors: 32 sectors of 4 blocks + 8 sectors of 16 blocks) |
| UID Size | 4 Bytes |
| Read Range | Up to 10 cm (depends on reader antenna geometry) |
| Data Transfer Rate | Up to 106 kbps |
| Communication Protocol | ISO/IEC 14443-A |
| Dimensions | 85.6 mm x 54 mm x 0.8 mm (CR80 ISO standard) |
| Material | PVC |
| Factory Default Key | FF FF FF FF FF FF (A/B key) |
| Weight | 0.007 kg |
Industrial Applications
The MIFARE Classic 4K blank RFID card is deployed across multiple commercial and institutional environments where reliable identification and data storage are required. Access control contractors use it for employee badges, visitor passes, and secure area entry in office buildings, hospitals, warehouses, and industrial plants. Public transportation operators integrate the card into fare collection systems where the 4K memory enables stored value, trip history, and multi-ride credential data. Loyalty program managers and gift card issuers value the printable surface for brand customization and the contactless interface for fast transaction processing. Educational institutions and government agencies use the card for student IDs, staff identification, and building access, benefiting from the standardized format and broad reader compatibility. System integrators deploying multi-application smart card schemes rely on the large sector count to partition data for separate applications on a single credential, reducing card issuance costs and simplifying credential management for end customers.
OEM / ODM Manufacturing Support
DO RFID Reader provides OEM and ODM services for wholesale buyers, system integrators, and project contractors who require customized RFID cards. Customers can request custom logo printing, specific chip initialization, pre-encoded sector data, unique UID ranges, custom cryptographic keys, and tailored packaging for retail or distribution channels. The manufacturing process supports both small-batch sampling for qualification and full-volume production runs for large-scale rollouts. Our engineering team works with buyers to define encoding specifications, print artwork requirements, and delivery timelines that align with project milestones. OEM partners receive consistent card quality across all production batches, ensuring that field-deployed credentials perform identically regardless of when they were manufactured. Contact info@dorfidreader.com to discuss your specific OEM requirements and obtain a customized quotation.
Factory Production Advantages
As a dedicated RFID card manufacturer, DO RFID Reader operates a production facility focused on consistency, capacity, and quality control. The factory produces millions of contactless cards annually, supporting both standard product lines and custom OEM orders. Each card undergoes individual chip testing and visual inspection before packaging to minimize field failures and encoding errors. Our production lines handle multiple order types simultaneously, allowing us to maintain short lead times for both small wholesale lots and large project orders. Raw material sourcing follows strict specifications to ensure dimensional accuracy, print adhesion, and chip bonding reliability. For distributors and procurement teams, this production capability translates into predictable delivery schedules, reduced risk of supply interruptions, and the ability to scale order volumes as project demands grow. Batch consistency is maintained through documented production procedures and in-process quality checks, so repeat orders match previous shipments in both physical dimensions and electrical performance.
Bulk Supply & Project Deployment Support
Wholesale buyers and system integrators require suppliers who can deliver uniform product across multiple delivery phases. DO RFID Reader supports tiered pricing based on order volume, with significant cost advantages for bulk quantities. The factory can stage shipments to match phased deployment schedules, reducing inventory holding costs for the buyer while ensuring card availability when needed. For large-scale access control upgrades, transportation fare system rollouts, or national identification programs, the manufacturer can commit to long-term supply agreements with fixed pricing and guaranteed production slots. Technical support is available to help integrators resolve reader compatibility issues, encoding questions, or deployment challenges. This combination of volume pricing, supply reliability, and technical assistance makes the manufacturer a practical partner for projects that cannot tolerate supply variability or inconsistent card quality. Request a quote for bulk quantities to evaluate pricing and lead time for your specific deployment volume.
Frequently Asked Questions
What readers are compatible with this card?
This MIFARE Classic 4K card is compliant with ISO/IEC 14443-A and works with most 13.56 MHz HF readers, including ACR122U, proximity reader terminals, and NFC-enabled mobile devices. System integrators should verify reader firmware supports MIFARE Classic product family.
Can I print on this card directly?
Yes. The PVC surface supports dye-sublimation and thermal transfer printing using industrial card printers from Zebra, Epson, Canon, and similar manufacturers. The blank surface accepts full-color edge-to-edge printing for photo IDs, branding, and barcode labels.
How much data can I store?
4096 bytes of user memory organized into 40 sectors. Developers can allocate sectors per application, enabling multi-purpose credentials that combine access control, cashless payment, biometric templates, and identification data on a single card.
What is the factory default key?
Cards ship with A/B key set to FF FF FF FF FF FF. This allows immediate programming and testing using standard reader development tools. Custom key values can be pre-configured during OEM production.
Do you support bulk orders for large projects?
Yes. DO RFID Reader supports wholesale quantities, phased deliveries, long-term supply agreements, and OEM customization for large-scale deployments. Contact info@dorfidreader.com with your volume requirements for pricing and lead time.
Is the card rewritable after personalization?
Yes. The MIFARE Classic 4K chip supports repeated write operations on unlocked sectors. Once a sector is programmed with custom keys, write access is controlled by authentication. Blank sectors remain freely writable until locked.
What is the typical lead time for wholesale orders?
Lead time depends on order volume and customization requirements. Standard blank cards typically ship within days of order confirmation. Custom printed or pre-encoded orders require additional production time. Contact our sales team for current lead time estimates.