STMicroelectronics M24LR64E-RMN6T/2

Overview

M24LR64E-RMN6T/2 from STMicroelectronics is a dual-interface Dynamic NFC/RFID tag IC integrating 64-Kbit EEPROM, ISO 15693 RF interface, I²C bus (400 kHz), energy harvesting analog output (Vout), and RF busy indicator (RF WIP/BUSY). It operates from 1.8 V to 5.5 V, supports 13.56 MHz carrier, and delivers 5 ms max I²C write time - used in smart packaging, industrial asset tagging, and battery-free sensor nodes where contactless data access and local power scavenging are required.

For engineers reviewing the M24LR64E-RMN6T/2 datasheet, M24LR64E-RMN6T/2 pinout, M24LR64E-RMN6T/2 application, or M24LR64E-RMN6T/2 equivalent, this page provides verified circuit role (dual-interface EEPROM tag with energy harvesting), exact package mapping (TSSOP8), validated pin functions (SCL, SDA, AC0/AC1, RF WIP/BUSY, Vout, VCC, VSS), and confirmed alternatives with documented RF/I²C security and timing differences.

Technical Context

The M24LR64E-R implements concurrent I²C and ISO 15693 interfaces: I²C enables host MCU read/write at up to 400 kHz with byte/page writes and automatic address incrementing, while RF mode supports 6.6 kbit/s (low) and 26 kbit/s (high) load-modulated responses using 423 kHz/484 kHz subcarriers. Its internal tuning capacitance (27.5 pF) eliminates external matching components for antenna coupling.

Energy harvesting is implemented via dedicated Vout pin delivering configurable sink current (four ranges), enabling operation without local power supply when energized by an RF field. Memory is partitioned into 8192 bytes for I²C access and 2048 × 32-bit blocks for RF access, with independent password protection: single password for I²C, multi-sector passwords for RF mode.

Key Specifications

Pinout & Package

Package: TSSOP8 (ECOPACK2®), 3.0 mm × 4.4 mm, 0.65 mm pitch - surface-mount compatible with automated assembly and suitable for space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-interface NFC tag applications.

Compared with NT3H2211W0FHKH and M24SR64-YMW6T/2, the M24LR64E-RMN6T/2 uniquely combines I²C host control, RF field-powered operation, and sector-level RF password security - making it the only choice for battery-free, MCU-managed smart tags requiring deterministic local + remote access.

Availability

M24LR64E-RMN6T/2 is available at Aetrix Electronics and suitable for smart packaging authentication, industrial asset tagging, and battery-free sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for M24LR64E-RMN6T/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, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and connectivity solutions for industrial, automotive, and consumer markets.

The M24LR64E-R belongs to the ST25 NFC/RFID tag family, engineered specifically for dual-interface, energy-harvesting applications where seamless integration between embedded systems and contactless infrastructure is critical.

FAQ

What is the function of the RF WIP/BUSY pin?

The RF WIP/BUSY pin is a user-configurable digital output that signals either "RF Write In Progress" or "RF Busy" state. When asserted, it indicates active RF command execution (e.g., block write, password presentation) or ongoing RF communication. This enables precise host MCU synchronization without fixed timeout delays, reducing system latency and improving deterministic response in time-critical applications like access control or high-throughput inventory.

Does the M24LR64E-RMN6T/2 require external tuning capacitors for the RF antenna?

No. The M24LR64E-RMN6T/2 integrates a 27.5 pF internal tuning capacitance between AC0 and AC1 pins, eliminating the need for external capacitors in most standard 13.56 MHz antenna designs. This simplifies PCB layout, reduces BOM count, and improves manufacturability - though antenna impedance matching still requires careful coil design and layout per ST's AN4471 application note.

How does the energy harvesting feature operate in practice?

The Vout pin delivers harvested DC power derived from the RF field, configurable across four sink current ranges (10/20/40/80 µA). It powers external circuitry such as sensors or signal conditioners - not the M24LR64E-R itself, which draws power directly from the RF field. Real-world output voltage depends on field strength and antenna coupling; typical operation yields 1.8–3.3 V under standard ISO 15693 reader conditions, sufficient to drive low-power analog sensors or logic gates.

Can the I²C and RF interfaces access memory simultaneously?

No. While the M24LR64E-R supports concurrent interface presence, memory access is serialized: an active RF transaction locks the EEPROM array, preventing I²C reads/writes until completion, and vice versa. This hardware-enforced arbitration prevents data corruption but requires software coordination - e.g., disabling RF polling during critical I²C firmware updates or using the RF WIP/BUSY pin to detect contention before initiating I²C operations.