Product Overview
The DO-4K is a blank, printable RFID card built around the industry-standard NXP MIFARE Classic 4K (S70) chip, operating at 13.56 MHz. Designed for system integrators, access control contractors, and commercial deployment teams, this card offers a 4096-byte memory structure divided into 32 sectors of 4 blocks and 8 sectors of 16 blocks. This expanded memory capacity makes it suitable for applications requiring more data storage than standard 1K cards, such as complex identification profiles, multi-application transport schemes, or loyalty point tracking. Manufactured by a dedicated do rfid reader manufacturer, the DO-4K serves as a blank medium, ready for custom programming, encoding, and printing by distributors, wholesalers, and OEM customers who require a reliable, bulk-supplied smart card for large-scale projects.
Key Advantages for Industrial and Commercial Deployment
For project managers and system integrators, the primary advantage of the DO-4K card lies in its balance of memory capacity, stable production, and broad compatibility. The 4K memory allows for storing multiple application data sets on a single card, reducing the need for users to carry multiple credentials. Wholesale buyers benefit from the card’s batch consistency, ensuring each unit from a production run performs identically in readers, which is critical for access control systems in office buildings, campuses, and industrial facilities. The use of NXP silicon provides a proven, stable supply chain, and as a factory committed to long-term cooperation, we maintain stock for fast lead times and bulk order fulfillment.
Key Features
- Ample 4K Memory: 4096 bytes of user memory organized into 40 sectors (32 x 4-block, 8 x 16-block). Ideal for storing multiple credentials, personal data, or application files on a single card.
- Standard 13.56 MHz HF Frequency: Operates at the globally accepted contactless frequency, compatible with the vast installed base of ISO/IEC 14443-A readers used in access control, transit, and payment systems.
- Blank & Printable: Supplied blank with factory default keys (FF FF FF FF FF FF). Compatible with dye-sublimation and thermal transfer card printers (e.g., Zebra, Epson, Canon) for custom branding, ID photos, or serial numbers.
- CRYPTO1 Encryption: Uses NXP’s CRYPTO1 algorithm to secure data transmission between the card and reader, providing a standard level of security for commercial access and identification applications.
- Durable PVC Construction: Standard CR80 size (85.6 mm x 54 mm x 0.8 mm) made from waterproof and durable PVC. Suitable for daily handling in employee badges, student IDs, and membership cards.
- 4-Byte UID: Standard 4-byte unique identifier for simple card recognition and anti-collision in multi-card environments.
Technical Specifications
| Operating Frequency | 13.56 MHz |
| Chip Type | NXP MIFARE Classic 4K (S70) |
| User Memory | 4096 Bytes (40 sectors: 32 sectors of 4 blocks + 8 sectors of 16 blocks) |
| UID Size | 4 Bytes |
| Read / Write Range | Up to 10 cm (reader antenna dependent) |
| Data Transfer Rate | Up to 106 kbps |
| Communication Protocol | ISO/IEC 14443-A |
| Card Dimensions | 85.6 mm x 54 mm x 0.8 mm (CR80) |
| Material | PVC |
| Factory Default Key (A/B) | FF FF FF FF FF FF |
| Weight | 0.007 kg |
Industrial Applications
- Access Control Systems: Used by system integrators for employee and visitor badges in corporate offices, government buildings, and industrial warehouses. The 4K memory allows for time-based access zones or elevator floor permissions to be stored directly on the card.
- Public Transportation Ticketing: Suitable for closed-loop transit systems where a single card holds a stored-value purse and journey history. The large sector count supports multi-route or multi-operator schemes.
- Identification Badges: Deployed in schools, hospitals, and event management for ID cards that combine a printed photo with embedded data for identity verification and cashless payments.
- Loyalty & Gift Card Programs: Retail chains and hospitality groups use the DO-4K for membership cards that track points, stored value, and member tier status across multiple locations.
- Parking & Tolling: Commercial parking operators deploy these cards for long-term contract parking, storing prepaid credits or vehicle registration data on the card.
OEM / ODM Manufacturing Support
As an OEM and ODM manufacturer, we provide flexible customization options for the DO-4K card. System integrators and project contractors can request custom chip programming, including pre-configured sector keys, data block preloading, or specific UID ranges. For branding, we support offset printing, silk screen, and digital printing on the PVC surface. Wholesale distributors can order custom packaging with their own SKU labels or bulk packaging configurations. Our engineering team provides technical documentation and sample support to ensure compatibility with your existing reader infrastructure before project deployment.
Factory Production Advantages
Our production facility focuses on stable manufacturing throughput, batch consistency, and quality inspection. For distributors managing large-scale deployment projects, this means every card in a 10,000-piece order performs identically to the sample. We utilize automated antenna tuning and chip bonding processes to minimize read range variation. Our supply chain management ensures consistent sourcing of NXP silicon, protecting project timelines from chip shortages. Export experience means we handle international shipping documentation and customs compliance for wholesale orders across different regions.
Bulk Supply & Project Deployment Support
For commercial buyers, we offer volume pricing tiers beginning at 200 pieces, with significant price breaks at 600 and 1,000 pieces and beyond. Bulk supply is supported by our production capacity to handle repeat orders for long-term contracts, such as annual badge refreshes for large enterprises or phased rollouts for transit system upgrades. We provide pre-production samples for compatibility testing, which is critical for system integrators certifying the card with a specific reader model or access control software. Project deployment support includes technical advice on sector layout optimization, key management, and encoding workflows for high-volume personalization.
FAQ
Can this card be printed with a standard ID card printer?
Yes. The DO-4K card is made from PVC and is compatible with dye-sublimation and thermal transfer card printers used by most system integrators and security departments.
What is the default key for programming?
The factory default key for both A and B sectors is FF FF FF FF FF FF. This allows immediate programming with standard reader tools like the ACR122U.
Is this card compatible with NFC smartphones?
Yes. The DO-4K card uses the ISO/IEC 14443-A protocol, which is the same protocol used by most NFC-enabled smartphones and tablets for reading NDEF data or app-specific content.
Can you supply cards with pre-programmed data for a specific project?
Yes. We support OEM programming services. Contact us with your sector key structure and data layout requirements for a custom supply quote.
What is the minimum order quantity for wholesale pricing?
Volume pricing is available from 200 pieces. Larger discounts apply for 600 and 1,000-card orders. For quantities exceeding 5,000 pieces, please request a custom quote for bulk supply pricing and lead time.
How do I request a sample for compatibility testing?
You can purchase a single sample directly from the product page. For project integrators needing multiple samples for testing, please contact us with your deployment volume for sample support.
For OEM customization, bulk orders, and project technical support, contact: info@dorfidreader.com