HF 13.56 MHzNXP

MIFARE Classic 1K (MF1S50)

Name: NXP MIFARE Classic 1K (MF1S50)
Brand: NXP

The NXP MIFARE Classic 1K (MF1S50) is an HF 13.56 MHz RFID tag IC, with 1 KB EEPROM (1024 bytes), organized in 16 sectors of 4 blocks (16 bytes per block), operating at 13.56 MHz under ISO/IEC 14443 Type A.

The original 1KB MIFARE Classic contactless smart card IC; the long-running access-control and transit reference design.

Official Datasheet ↗

Frequency

13.56 MHz

Protocol

ISO/IEC 14443 Type A

Memory

1 KB EEPROM (1024 bytes), organized in 16 sectors of 4 blocks (16 bytes per block)

Interface

RF (contactless), antenna coil connections LA/LB

Temp Range

-25°C to +70°C ambient, -55°C to +125°C storage

Form Factor

Bumped die on sawn wafer (8-inch 120μm or 75μm, 12-inch 120μm), MOA4 module (SOT500-2), MOA8 module (SOT500-4)

Full Specifications

Manufacturer	NXP
Frequency Category	HF 13.56 MHz
Frequency	13.56 MHz
Protocol	ISO/IEC 14443 Type A
Memory	1 KB EEPROM (1024 bytes), organized in 16 sectors of 4 blocks (16 bytes per block)
Interface	RF (contactless), antenna coil connections LA/LB
Temperature Range	-25°C to +70°C ambient, -55°C to +125°C storage
Form Factor	Bumped die on sawn wafer (8-inch 120μm or 75μm, 12-inch 120μm), MOA4 module (SOT500-2), MOA8 module (SOT500-4)
Security	CRYPTO1 stream cipher, mutual three-pass authentication (ISO/IEC DIS 9798-2), two keys (A/B) per sector with programmable access conditions, 7-byte UID or 4-byte NUID, Random ID support (7-byte version), NXP Originality Check support

Engineering Brief

The MIFARE Classic EV1 1K (MF1S50yyX/V1) is NXP's mainstream 13.56 MHz contactless smart card IC compliant with ISO/IEC 14443 Type A. It features 1 KB of EEPROM organized into 16 sectors with user-definable access conditions per block, supporting both 7-byte UID and 4-byte NUID options with optional Random ID. The chip employs CRYPTO1 stream cipher for mutual authentication and encrypted communication, with two secret keys per sector enabling multi-application key hierarchies. Typical transaction times are under 100 ms, with 10-year data retention, 200,000 write cycles endurance, and delivery options including bare die on wafer or pre-assembled contactless modules (MOA4/MOA8).

Free tools for this chip

Tool
Memory Map Visualizer
See UID, lock bytes, and user memory laid out.

Typical Applications

Standards & Compliance

ISO/IEC 14443 Type A

Frequently Asked Questions

How much memory does the MIFARE Classic 1K have?

The MIFARE Classic 1K has 1 KB (1024 bytes) of EEPROM organized into 16 sectors, with each sector containing 4 blocks of 16 bytes. This provides user-configurable memory for access control credentials, transit tickets, or multi-application data storage.

What is the difference between MIFARE Classic UID and NUID?

MIFARE Classic 1K is available with either a 7-byte UID (unique identifier) or a 4-byte NUID (non-unique identifier). The 7-byte UID version supports Random ID functionality for enhanced privacy, generating a new random identifier for each transaction session.

Is MIFARE Classic 1K secure for access control systems?

MIFARE Classic 1K uses the CRYPTO1 stream cipher for authentication and encryption, which has known vulnerabilities and is considered legacy security. For new deployments requiring high security, NXP recommends newer products like MIFARE DESFire or MIFARE Plus with AES encryption.

How many write cycles does MIFARE Classic 1K support?

The MIFARE Classic 1K EEPROM supports 200,000 write cycles with 10-year data retention. Typical transaction time (including authentication and data transfer) is under 100 milliseconds.

What is MIFARE Classic sector access control?

Each of the 16 sectors has two secret keys (Key A and Key B) with programmable access conditions that control read, write, increment, and decrement operations per block. This allows multi-application cards with isolated key hierarchies and different security levels per sector.

Does MIFARE Classic 1K work with NFC smartphones?

MIFARE Classic 1K is ISO 14443 Type A compliant and can be detected by NFC smartphones, but read/write operations require either native MIFARE Classic support (common on Android) or special host card emulation implementations, as it is not an NFC Forum standardized tag type.

Explore

Manufacturer

All NXP chips →

Standards

ISO/IEC 14443 Type A

Applications

Compare with…

Cross-manufacturer alternatives

Shanghai Fudan Microelectronics
FM11RF08

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