NXP Semiconductors MF1S7031XDUD,005

Overview

MF1S7031XDUD,005 from NXP Semiconductors is a contactless smart card IC compliant with ISO/IEC 14443 Type A, featuring 4 kB EEPROM organized in 40 sectors (32×4-block + 8×16-block), 13.56 MHz RF interface, 4-byte non-unique ID (NUID), and CRYPTO1-based three-pass authentication. It enables <100 ms ticketing transactions in public transport systems.

For engineers reviewing the MF1S7031XDUD,005 datasheet, MF1S7031XDUD,005 pinout, MF1S7031XDUD,005 application, or MF1S7031XDUD,005 equivalent, key selection considerations include NUID vs UID handling, sector-based access control with dual keys per sector, 10-year data retention, 100,000 write cycles, and antenna-coupled power/data transfer without external components.

Technical Context

The MF1S7031XDUD,005 integrates an RF interface compliant with ISO/IEC 14443A, including modulator/demodulator, rectifier, clock regenerator, POR, and voltage regulator - all powered solely by the reader's 13.56 MHz carrier field. Its digital control unit executes anticollision, authentication, and memory operations using on-chip logic and CRYPTO1 stream cipher.

Memory is partitioned into 40 sectors (32 sectors × 4 blocks + 8 sectors × 16 blocks), each ending in a trailer block storing two 48-bit keys and programmable access bits. Authentication precedes every memory operation, enforcing sector-level security via key A or B and configurable read/write/increment/decrement permissions per block type.

Key Specifications

Pinout & Package

MF1S7031XDUD,005 is supplied as a bumped die on 8-inch wafer (120 μm thickness, film frame carrier, Au bumps) - no discrete package or pins. It interfaces exclusively via two antenna terminals (LA and LB) directly bonded to an external coil; no PCB pads, leads, or solderable terminals are present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar contactless smart card IC applications.

Compared with MF1S7001XDUD, the MF1S7031XDUD,005 trades UID uniqueness for lower cost and simplified anticollision, while compared with MF1S7030XDA4, it offers wafer-level flexibility at the expense of module-level ease-of-use - enabling trade-offs between security assurance, production scalability, and mechanical integration.

Availability

MF1S7031XDUD,005 is available at Aetrix Electronics and suitable for public transport ticketing, access management, and electronic toll collection requiring stable component supply across high-volume smart card manufacturing programs.

Supply support for MF1S7031XDUD,005 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and identification markets, with headquarters in Eindhoven, Netherlands.

The MF1S7031XDUD,005 belongs to the MIFARE Classic 4K product line - designed specifically for mainstream contactless smart card applications demanding fast, low-cost, and standards-compliant RFID functionality in transit, access, and loyalty systems.

FAQ

What is the primary function of the MF1S7031XDUD,005?

The MF1S7031XDUD,005 is a contactless smart card IC compliant with ISO/IEC 14443 Type A, providing 4 kB of secure EEPROM memory, CRYPTO1-based authentication, and RF-powered operation at 13.56 MHz. Its core function is to serve as a tamper-resistant credential and data storage element in transit, access, and payment systems - with the MF1S7031XDUD,005 specifically configured with 4-byte NUID for cost-sensitive deployments.

How does the 4-byte NUID in MF1S7031XDUD,005 differ from the 7-byte UID in other variants?

The MF1S7031XDUD,005 uses a 4-byte Non-Unique ID (NUID), meaning the identifier is not guaranteed to be globally unique - unlike the 7-byte UID in MF1S7001XDUD. This affects anticollision: NUID operates only at cascade level 1 per ISO/IEC 14443-3, limiting simultaneous card handling in dense fields. The MF1S7031XDUD,005 datasheet explicitly states NUID is intended for applications where uniqueness is not required, such as disposable transit cards or closed-loop systems with controlled reader zones.

Can MF1S7031XDUD,005 be used in value block applications like electronic purses?

Yes, the MF1S7031XDUD,005 fully supports value block operations - increment, decrement, restore, and transfer - with built-in backup management and triple-stored value format for error resilience. These functions are enabled per sector via access bit configuration in the sector trailer, and require successful CRYPTO1 authentication before execution. The MF1S7031XDUD,005 implements the same value block specification as the full MIFARE Classic 4K family, making it suitable for electronic purse applications where balance integrity is critical.

What antenna interface requirements apply to MF1S7031XDUD,005?

The MF1S7031XDUD,005 connects exclusively via two terminals - LA and LB - to an external planar antenna coil. No external matching components are needed, as the IC integrates a resonant tank interface. Antenna design must target 13.56 MHz resonance with Q-factor and inductance optimized per NXP's AN11004 guidelines; typical values range from 1–2 μH inductance and 20–30 Ω series resistance. The MF1S7031XDUD,005's input capacitance is 14.9–19.0 pF, which forms part of the LC tank with the coil.

Is MF1S7031XDUD,005 compatible with standard ISO/IEC 14443A readers?

Yes, the MF1S7031XDUD,005 is fully compliant with ISO/IEC 14443 Type A at the physical, RF, and protocol layers - including ATQA response (0002h), SAK (18h), and command set (REQA, WUPA, HALT, AUTH, READ, WRITE, etc.). It interoperates with all certified ISO/IEC 14443A readers, such as those based on NXP PN512, STMicroelectronics ST25R3916, or Infineon SLI13. The MF1S7031XDUD,005 requires no firmware modification on the reader side beyond standard MIFARE Classic support.