STMicroelectronics M24SR04-YDW6T/2

Overview

M24SR04-YDW6T/2 from STMicroelectronics is a dynamic NFC/RFID tag IC with dual I²C and contactless interfaces, implementing NFC Forum Type 4 Tag and ISO/IEC 14443 Type A protocols. It integrates 4-Kbit (512-byte) EEPROM with NDEF support, 7-byte UID, 128-bit password protection, and operates from 2.7 V to 5.5 V across –40 °C to +85 °C. It enables secure data exchange in smart posters, industrial asset tags, and IoT device configuration.

For engineers reviewing the M24SR04-YDW6T/2 datasheet, M24SR04-YDW6T/2 pinout, M24SR04-YDW6T/2 application, or M24SR04-YDW6T/2 equivalent, this page delivers verified functional modes (I²C slave, RF tag, dual-interface session coordination), memory access constraints (246-byte max read/write per command), GPO configuration options (INT, RF busy, WIP status), and package-specific terminal mapping for TSSOP8.

Technical Context

The M24SR04-YDW6T/2 implements concurrent I²C slave operation and ISO/IEC 14443-A-compliant RF communication, managed via independent session tokens (I²C token and RF token) to prevent interface conflict. Its dual-interface architecture allows simultaneous host microcontroller access and NFC reader interaction only when explicitly coordinated through session control commands.

It supports full NFC Forum Type 4 Tag functionality including NDEF message handling, CC file management, and system-level security features such as I²C password protection, NDEF file locking, and permanent state enable/disable. The internal 25 pF tuning capacitance eliminates need for external RF matching components in standard antenna designs.

Key Specifications

Pinout & Package

Package: TSSOP8 (DW), ECOPACK2® compliant, 3.0 mm × 4.4 mm body, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dynamic NFC tag applications.

Compared with M24SR64-YDW6T/2, this part trades memory depth for lower unit cost and smaller die size; compared with NT3H2111, it adds critical industrial features-GPO-driven host coordination, permanent state disable, and extended temperature write endurance-making it suitable for regulated environments.

Availability

M24SR04-YDW6T/2 is available at Aetrix Electronics and suitable for smart poster deployment, industrial asset tagging, IoT device provisioning, and secure peripheral configuration requiring stable component supply over extended production lifecycles.

Supply support for M24SR04-YDW6T/2 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

STMicroelectronics is a global semiconductor leader specializing in microcontrollers, power management, sensors, and connectivity solutions, with strong focus on industrial, automotive, and IoT markets.

The M24SR series belongs to ST's ST25 NFC/RFID product line, designed specifically for secure, dual-interface data exchange in resource-constrained embedded systems where battery-free operation and smartphone interoperability are essential.

FAQ

What is the maximum NDEF message size supported by M24SR04-YDW6T/2?

The M24SR04-YDW6T/2 supports up to 512 bytes of NDEF data in its EEPROM, constrained by the total memory size and mandatory system file overhead (CC file, system file). Real-world usable NDEF payload is typically 472–496 bytes depending on file structure and password fields. The device enforces NDEF compliance via built-in TLV parsing and does not permit oversized records that violate NFC Forum specifications.

Can the I²C and RF interfaces operate simultaneously?

No - the M24SR04-YDW6T/2 uses a session arbitration mechanism that prevents concurrent I²C and RF access. When an I²C session is active, RF commands are rejected until the session closes; similarly, an open RF session blocks I²C writes until terminated. This hardware-enforced mutual exclusion ensures memory coherency and eliminates race conditions without requiring external coordination logic.

How is the 7-byte UID used in secure authentication workflows?

The factory-programmed 7-byte UID serves as a cryptographic binding anchor: it is included in challenge-response sequences during password verification and appears in signed NDEF records to prove tag authenticity. Unlike software-generated IDs, this UID cannot be altered or cloned, providing a root-of-trust foundation for secure provisioning and anti-counterfeiting schemes in medical and industrial deployments.

Does M24SR04-YDW6T/2 require external tuning capacitors for the RF interface?

No - the device integrates 25 pF internal tuning capacitance across AC0/AC1 pins, eliminating the need for external capacitors in standard 13.56 MHz antenna designs. This simplifies PCB layout and reduces BOM count. However, fine-tuning may still be required for non-standard antenna geometries or impedance mismatches, in which case small external capacitors (<10 pF) can be added in parallel.