MIFARE Classic 4K (MF1S70)
The NXP MIFARE Classic 4K (MF1S70) is an HF 13.56 MHz RFID tag IC, with 4096 bytes (4 kB) EEPROM organized in 32 sectors of 4 blocks and 8 sectors of 16 blocks (one block = 16 bytes), operating at 13.56 MHz under ISO/IEC 14443 Type A.
4KB variant of the original MIFARE Classic with 40 sectors; widely deployed in transit and stadium ticketing.
Full Specifications
| Manufacturer | NXP |
|---|---|
| Frequency Category | HF 13.56 MHz |
| Frequency | 13.56 MHz |
| Protocol | ISO/IEC 14443 Type A |
| Memory | 4096 bytes (4 kB) EEPROM organized in 32 sectors of 4 blocks and 8 sectors of 16 blocks (one block = 16 bytes) |
| Interface | RF (contactless) |
| Temperature Range | -25°C to +70°C (ambient) |
| Form Factor | Bumped die on sawn wafer (8-inch 120 µm/75 µm, 12-inch 120 µm), MOA4 (SOT500-2), MOA8 (SOT500-4) contactless modules |
| Security | CRYPTO1 stream cipher, mutual three-pass authentication (ISO/IEC DIS 9798-2), two keys (A/B) per sector, 7-byte UID or 4-byte NUID, Random ID support |
Engineering Brief
The MIFARE Classic EV1 4K (MF1S70yyX/V1) is NXP's enhanced 4 kB contactless smart card IC operating at 13.56 MHz per ISO/IEC 14443-A. It features 40 sectors (32×4 blocks + 8×16 blocks), CRYPTO1 mutual authentication with two keys per sector, and supports both 7-byte UID and 4-byte NUID variants with optional Random ID. The chip offers 10-year data retention, 200,000 write cycles, and fast <100 ms transaction times. Available as bumped wafer (8-inch/12-inch) or MOA4/MOA8 modules, it is widely deployed in transit ticketing, access control, and loyalty systems requiring multi-application support and key hierarchy.
Typical Applications
Standards & Compliance
Frequently Asked Questions
How much memory does the MIFARE Classic 4K have?
The MIFARE Classic 4K has 4096 bytes (4 kB) of EEPROM organized into 40 sectors: 32 sectors with 4 blocks each and 8 sectors with 16 blocks each, where each block is 16 bytes.
What is the difference between MIFARE Classic 1K and 4K?
The MIFARE Classic 4K (MF1S70) has 4096 bytes of memory across 40 sectors, while the 1K variant has 1024 bytes across 16 sectors. Both use the same CRYPTO1 authentication and ISO14443A protocol, but the 4K supports larger multi-application deployments.
What security does MIFARE Classic 4K use?
MIFARE Classic 4K uses CRYPTO1 stream cipher with mutual three-pass authentication per ISO/IEC DIS 9798-2. Each sector has two independent keys (A and B), and it supports 7-byte UID, 4-byte NUID, or Random ID for anti-cloning.
How many write cycles does the MIFARE Classic 4K support?
The MIFARE Classic 4K EEPROM supports 200,000 write cycles with 10-year data retention, making it suitable for high-frequency transit and access control applications.
Is MIFARE Classic 4K compatible with NFC phones?
MIFARE Classic 4K uses ISO14443A communication but is not an NFC Forum standardized tag type. While many Android phones support MIFARE Classic through proprietary APIs, compatibility is device-dependent and not guaranteed across all NFC-enabled phones.
What is the read range of MIFARE Classic 4K?
MIFARE Classic 4K operates at 13.56 MHz with typical read ranges of 2.5–10 cm depending on antenna design and reader power. Transaction times are typically under 100 milliseconds for authentication and data exchange.
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Cross-manufacturer alternatives
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