STMicroelectronics M24SR64-YMC6T/2

Overview

M24SR64-YMC6T/2 from STMicroelectronics is a dynamic NFC/RFID tag IC with dual-interface operation (I²C + 13.56 MHz RF), 64-Kbit EEPROM, NFC Forum Type 4 Tag compliance, and ISO/IEC 14443 Type A support. It serves as a secure, rewritable memory node in contactless identification systems-enabling smartphone-based configuration of industrial sensors, medical device calibration data storage, and asset tagging with NDEF message support.

For engineers reviewing the M24SR64-YMC6T/2 datasheet, M24SR64-YMC6T/2 pinout, M24SR64-YMC6T/2 application, or M24SR64-YMC6T/2 equivalent, key selection criteria include I²C slave timing at 1 MHz, RF operating temperature limit (–40 °C to +85 °C), UID uniqueness (7-byte), EEPROM endurance (1M cycles @25 °C), and GPO configurability for session status signaling.

Technical Context

The device operates in three functional modes: I²C-only (host-controlled memory access), Tag-only (NFC reader-initiated NDEF read/write), and Dual Interface (coordinated access where I²C host can lock RF sessions or trigger interrupts via GPO). Its RF interface implements full NFC Forum Type 4 Tag protocol stack-including Capability Container, NDEF Select, ReadBinary, and UpdateBinary commands-with built-in CRC validation and anticollision handling.

I²C communication follows standard two-wire slave protocol with configurable device address, 1 MHz max clock rate, and timeout protection. The RF subsystem integrates internal 25 pF tuning capacitance, eliminating external matching components, and supports RF disable control to suppress unintended field coupling during I²C operations.

Key Specifications

Pinout & Package

Package: 8-lead TSSOP8 (ECOPACK2®), SO8, or UFDFPN8-surface-mount compatible with automated PCB assembly and space-constrained designs such as wearable medical patches or smart sensor nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M24SR64-YMC6T/2, the UFDFPN8 variant offers 40% smaller footprint but requires finer-pitch reflow; the /3 suffix provides higher reel quantity for high-volume SMT lines-neither alters memory architecture, RF performance, or I²C timing.

Availability

M24SR64-YMC6T/2 is available at Aetrix Electronics and suitable for industrial asset tagging, medical device calibration storage, smart home sensor configuration, and automotive cabin module personalization requiring stable component supply across multi-year production cycles.

Supply support for M24SR64-YMC6T/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 headquartered in Geneva, specializing in microcontrollers, power management, sensors, and connectivity solutions for industrial, automotive, and consumer markets.

The M24SR64-Y belongs to the ST25 NFC/RFID product line, designed specifically for secure, dual-interface data exchange between microcontrollers and NFC-enabled smartphones-targeting applications demanding tamper-resistant memory, field-upgradable configuration, and seamless human-machine interaction.

FAQ

What is the maximum I²C clock frequency supported by M24SR64-YMC6T/2?

The device supports I²C communication up to 1 MHz under standard-mode-plus timing conditions. This allows high-speed memory access without compromising signal integrity on typical 3.3 V PCB traces. The internal I²C slave logic includes clock stretching and timeout recovery to prevent bus lockup during EEPROM write cycles.

Does M24SR64-YMC6T/2 require external tuning capacitors for its RF interface?

No. The IC integrates 25 pF internal tuning capacitance directly across AC0/AC1 pins, eliminating the need for external capacitors in most antenna designs. This simplifies layout, reduces BOM count, and improves RF consistency across manufacturing lots-provided the antenna coil inductance falls within the specified 0.8–1.5 µH range.

How is memory access protected against unauthorized writes?

Access protection uses two independent 128-bit password mechanisms: one for NDEF file operations (verified via ISO/IEC 7816-4 Verify command) and another for I²C interface locking (stored in System File). Passwords persist through power cycles and support permanent lockout after three failed attempts-enforcing secure provisioning in field-deployed devices.

Can M24SR64-YMC6T/2 operate in environments above 85 °C?

I²C functionality remains fully rated from –40 °C to +105 °C, but RF operation is limited to –40 °C to +85 °C. Above 85 °C, the RF front-end may fail to establish reliable coupling with NFC readers due to increased parasitic losses and reduced Q-factor in the antenna circuit-though I²C memory access continues uninterrupted.