NXP Semiconductors MF1S7031XDUD/V1V

Overview

MF1S7031XDUD/V1 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 operating frequency, 106 kbit/s data rate, and 4-byte non-unique ID (NUID) for cost-sensitive ticketing and access systems.

For engineers reviewing the MF1S7031XDUD/V1 datasheet, MF1S7031XDUD/V1 pinout, MF1S7031XDUD/V1 application, or MF1S7031XDUD/V1 equivalent, key selection considerations include NUID vs. UID identity model, sector-based CRYPTO1 authentication, antenna-coupled power delivery, and <100 ms typical transaction time including backup management.

Technical Context

The MF1S7031XDUD/V1 implements a dedicated RF interface per ISO/IEC 14443A with integrated rectifier, voltage regulator, clock regenerator, and Power-On Reset - enabling fully passive operation powered solely by reader field coupling. Its digital control unit executes anticollision, three-pass mutual authentication, and memory operations without external components.

Memory is partitioned into 40 sectors with configurable access conditions per sector trailer; each sector includes data blocks (read/write or value-type) and a trailer holding two 48-bit keys (A/B) and access bits. Value blocks support atomic increment/decrement/transfer with built-in redundancy and backup management for electronic purse use cases.

Key Specifications

Pinout & Package

MF1S7031XDUD/V1 is supplied as a bumped die on 8-inch wafer (120 μm thickness, film frame carrier), requiring integration into a contactless module (e.g., MOA4/MOA8) or custom antenna substrate. It has no conventional package pins; electrical connection is made exclusively via two antenna terminals (LA and LB).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MF1S7031XDUD/V1, MF1S7001XDUD/V1 adds UID uniqueness assurance at the silicon level - critical for federated identity systems - while MF1S5031XDA4/V1 trades wafer-level integration for immediate module-level readiness, shortening time-to-market for reader OEMs.

Availability

MF1S7031XDUD/V1 is available at Aetrix Electronics and suitable for public transportation ticketing, access management, and electronic toll collection requiring stable component supply, wafer-level sourcing flexibility, and long-term lifecycle continuity.

Supply support for MF1S7031XDUD/V1 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 MIFARE Classic EV1 product line - including MF1S7031XDUD/V1 - was engineered for mainstream contactless smart card applications demanding proven security, low-cost manufacturing, and ISO/IEC 14443A interoperability in high-volume deployments.

FAQ

What is the primary function of MF1S7031XDUD/V1 in a contactless system?

The MF1S7031XDUD/V1 serves as a passive ISO/IEC 14443A-compliant PICC (Proximity Integrated Circuit Card) IC, providing secure, battery-free data storage and cryptographic authentication for smart cards and tags. It derives power from the reader's RF field and executes anticollision, sector-based CRYPTO1 authentication, and memory operations - all within the MF1S7031XDUD/V1 silicon without external components.

How does the 4-byte NUID in MF1S7031XDUD/V1 differ from the 7-byte UID in other variants?

The MF1S7031XDUD/V1 uses a 4-byte non-unique ID (NUID), meaning identifiers may repeat across devices - intended for closed systems where uniqueness is enforced at the application or server level. In contrast, the 7-byte UID variant (e.g., MF1S7001XDUD/V1) guarantees globally unique identifiers per chip, required for open or federated identity infrastructures where hardware-level uniqueness is mandatory.

Can MF1S7031XDUD/V1 support electronic purse functionality like balance updates?

Yes, MF1S7031XDUD/V1 supports electronic purse operations through its value block feature: it enables atomic increment, decrement, restore, and transfer commands on specially formatted 16-byte blocks. These blocks store values three times (twice non-inverted, once inverted) with built-in backup management - ensuring data integrity during power loss or interrupted transactions in MF1S7031XDUD/V1-based fare or payment cards.

What antenna design considerations apply to MF1S7031XDUD/V1?

MF1S7031XDUD/V1 connects directly to an external antenna coil via LA and LB terminals, forming a series-resonant LC circuit tuned to 13.56 MHz. Antenna geometry, number of turns, and matching capacitor selection determine operating distance (up to 100 mm) and power transfer efficiency. Reference designs in NXP Application Note AN11009 specify optimal layout practices - critical because MF1S7031XDUD/V1 contains no internal matching network.

Is MF1S7031XDUD/V1 compatible with standard ISO/IEC 14443A readers?

Yes, MF1S7031XDUD/V1 is fully compliant with ISO/IEC 14443 Type A at the physical, RF, and protocol layers - including ATQA and SAK responses, REQA/WUPA command handling, and frame timing. It interoperates with any certified ISO/IEC 14443A reader without firmware modification, though application-layer security (CRYPTO1) requires reader-side key management aligned with MF1S7031XDUD/V1 sector configurations.