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Home > Products > RF and Wireless > RFID, RF Access, Monitoring ICs

STMicroelectronics M24LR04E-RUW20/2

Name: M24LR04E-RUW20/2
Brand: STMicroelectronics
SKU: M24LR04E-RUW20/2
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M24LR04E-RUW20/2

Manufacturer:: STMicroelectronics

Category:: RFID, RF Access, Monitoring ICs

Package:: Die

Datasheet:: M24LR04E-RUW20/2.pdf

Description:: MEMORY

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M24LR04E-RUW20/2 from STMicroelectronics is a dual-interface Dynamic NFC/RFID tag IC integrating 4-Kbit EEPROM, ISO 15693 RF interface, and I²C bus. It operates from 1.8 V to 5.5 V, supports energy harvesting via analog Vout pin, and delivers up to 26 kbit/s RF data rate with Manchester-coded load modulation. Used in smart labels for industrial asset tracking where battery-free operation and dual wired/wireless access are required.

For engineers reviewing the M24LR04E-RUW20/2 datasheet, M24LR04E-RUW20/2 pinout, M24LR04E-RUW20/2 application, or M24LR04E-RUW20/2 equivalent, key selection criteria include ISO 15693 compliance, 4-Kbit EEPROM organization (512 bytes I²C / 128 × 32-bit RF blocks), RF busy signaling, energy harvesting sink current configuration, and dual-mode password protection (single I²C / multiple RF).

Technical Context

The M24LR04E-RUW20/2 implements a true dual-interface architecture: its I²C port enables direct microcontroller read/write at up to 400 kHz, while its contactless interface complies fully with ISO 15693 and ISO 18000-3 Mode 1 standards. The device uses internal tuning capacitance (27.5 pF) for antenna matching and supports both 10% and 100% ASK modulation on the reader-to-tag path.

It features autonomous RF write-in-progress indication via the RF WIP/BUSY pin, configurable energy harvesting output (Vout) with four sink current ranges, and independent security domains - single-password lock for I²C writes and multi-sector password protection for RF operations - all managed through dedicated configuration registers.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory capacity	4-Kbit EEPROM: 512 bytes accessible via I²C; 128 blocks × 32 bits (4 bytes) via RF.
I²C interface	Two-wire serial interface supporting 400 kHz protocol; includes timeout detection and ACK polling.
RF interface	ISO 15693/18000-3 Mode 1 compliant; 13.56 MHz ±7 kHz carrier; 6.6/26/53 kbit/s data rates.
Energy harvesting	Analog Vout pin provides harvested power with 4 user-selectable sink current ranges.
Write endurance	1 million cycles at 25 °C; 150k cycles at 85 °C; >40-year data retention.
Operating temperature	–40 °C to +85 °C; qualified for industrial-grade embedded tagging applications.
Unique identifier	64-bit factory-programmed UID; immutable and globally unique per device.

Pinout & Package

Package: UFDFPN8 (ECOPACK2®), 2 mm × 2 mm, 0.4 mm pitch, wettable flank.

Pin/Terminal	Circuit Role	Design Meaning
SCL	I²C clock input	Accepts standard I²C clock signals up to 400 kHz; includes internal timeout logic.
SDA	I²C bidirectional data line	Open-drain I²C data line with internal pull-up; supports byte/page read/write and ACK polling.
RF WIP/BUSY	Configurable digital output	Signals RF write progress or RF busy state; programmable via configuration register.
Vout	Energy harvesting analog output	Delivers harvested RF power; sink current range selected by EH_enable bit and external resistor.
AC0, AC1	RF antenna connection	Differential RF port for 13.56 MHz coil; includes internal 27.5 pF tuning capacitance.
VSS	Ground reference	Primary ground return for both I²C and RF circuits; requires low-impedance PCB connection.
VCC	Supply voltage input	Single supply 1.8–5.5 V; powers I²C interface and internal logic; not used during pure RF operation.

Key Features

Feature	Design Value
Dual-interface memory access	Simultaneous I²C and RF read/write without conflict; enables real-time local update + remote interrogation.
Configurable RF busy signaling	RF WIP/BUSY pin can be set to indicate either write-in-progress or general RF activity - simplifies host MCU polling logic.
Multi-level RF security	Per-block password protection in RF mode; supports sector locking and password presentation commands per ISO 15693 extensions.
Energy harvesting optimization	Vout pin supports four discrete sink current levels (10/20/40/80 µA), enabling precise power budgeting for passive sensor nodes.
Industrial temperature resilience	Guaranteed operation from –40 °C to +85 °C with full EEPROM endurance and timing specs maintained across range.

Applications

Smart Industrial Labels

Asset Tracking Tags

Use Scenario: Reusable metal-mount label on CNC machine tooling, updated locally via I²C during maintenance and queried remotely via handheld RFID reader.

IC Role / Device Role / Timing Role: Dual-interface EEPROM storing calibration data, firmware version, and usage logs; RF interface enables non-contact verification without opening enclosures.

Use Value: Eliminates manual logbook entry and prevents unauthorized firmware updates via I²C password lock and RF sector protection.

Use Scenario: High-value logistics container tag scanned at warehouse gates and updated at loading docks using portable I²C programmer.

IC Role / Device Role / Timing Role: ISO 15693-compliant tag IC providing 53 kbit/s Fast Inventory Initiated response for rapid pallet-level scanning; I²C allows secure batch reconfiguration.

Use Value: Reduces gate dwell time by 40% vs. legacy 106 kbit/s tags due to optimized subcarrier timing and fast command support.

Energy-Harvesting Sensor Nodes

Secure Document Authentication

Use Scenario: Battery-free temperature/humidity sensor node powered solely by RF field; stores readings locally and transmits on demand.

IC Role / Device Role / Timing Role: Energy harvesting interface (Vout) powers external sensor ASIC; 4-Kbit EEPROM retains 72 hrs of 1-min interval logs; RF reads data on request.

Use Value: Enables maintenance-free deployment in inaccessible locations (e.g., HVAC ducts) with no battery replacement cycle.

Use Scenario: Tamper-evident ID card embedding M24LR04E-RUW20/2 for government-issued credentials with biometric binding.

IC Role / Device Role / Timing Role: Secure storage of cryptographic keys and biometric templates; RF interface performs challenge-response authentication; I²C enables secure provisioning during issuance.

Use Value: Prevents cloning via 64-bit UID + multi-sector RF password enforcement and I²C write-lock bit activation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ST25DV04K-IER	Same ST25 family; adds I²C interrupt (IRQ) pin and dynamic NFC register mapping; 4-Kbit EEPROM; identical RF spec.	Requires IRQ-driven host firmware; better suited for event-triggered logging vs. polled status checks.	Select when system demands hardware interrupt notification for RF activity or memory change events.
NXP NT3H2111W0FHKH	4-Kbit FRAM (not EEPROM); faster write (<1 µs), unlimited endurance; ISO 15693 RF; no energy harvesting output.	No Vout pin; cannot power external circuitry; FRAM eliminates write delay but lacks harvested-power capability.	Select when ultra-fast write cycles and infinite endurance outweigh need for energy harvesting or analog power delivery.

Compared with ST25DV04K-IER, M24LR04E-RUW20/2 offers simpler polling-based integration and integrated energy harvesting, while NT3H2111W0FHKH trades EEPROM persistence and power delivery for FRAM speed and endurance - making M24LR04E-RUW20/2 optimal for self-powered sensor tags requiring long-term data retention.

Availability

M24LR04E-RUW20/2 is available at Aetrix Electronics and suitable for industrial asset tracking, smart label deployment, battery-free sensor nodes, and secure document authentication requiring stable component supply across multi-year production cycles.

Supply support for M24LR04E-RUW20/2 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, sensors, power ICs, and connectivity solutions for industrial, automotive, and consumer markets.

The M24LR04E-RUW20/2 belongs to the ST25 NFC/RFID tag product line, engineered specifically for dual-interface, energy-harvesting-enabled identification and data logging in industrial IoT and secure physical-digital bridging applications.

FAQ

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

The RF WIP/BUSY pin is a user-configurable digital output that indicates either "RF Write In Progress" or general "RF Busy" status, depending on the setting of the RF_WIP_BUSY bit in the configuration register. It enables host MCUs to avoid polling delays by synchronizing I²C access with ongoing RF operations, reducing system latency in dual-interface applications.

How does energy harvesting work on the M24LR04E-RUW20/2?

Energy harvesting is implemented via the Vout pin, which outputs rectified and regulated power derived from the 13.56 MHz RF field. Four sink current ranges (10/20/40/80 µA) are selectable using the EH_enable bit and an external resistor network. This harvested power can directly drive low-power external sensors or logic without requiring a battery or wired supply.

Can the I²C and RF interfaces operate simultaneously?

Yes - the M24LR04E-RUW20/2 supports concurrent I²C and RF operation. Its architecture isolates the two interfaces at the memory controller level: I²C accesses the EEPROM array directly, while RF commands route through a separate RF state machine. No arbitration or conflict occurs, enabling real-time local updates during remote interrogation.

What security mechanisms protect memory access?

Security is implemented at two levels: I²C mode uses a single global password (I2C_Write_Lock bit) to prevent unauthorized writes, while RF mode supports per-sector password protection with dedicated Present-sector Password and Lock-sector commands per ISO 15693 extensions. Both modes enforce password presentation before write access, and the 64-bit UID prevents cloning at the physical layer.

M24LR04E-RUW20/2 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: Die

Packaging:: Bulk

Product Status:: Active

Type:: RFID Transponder

Frequency:: 13.56MHz

Standards:: ISO 15693, ISO 18000-3, NFC

Interface:: I2C

Voltage - Supply:: 1.8V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: Die

M24LR04E-RUW20/2 FAQ

1.How can I place an order for M24LR04E-RUW20/2 through Aetrix?

Please submit a Request for Quotation (RFQ) for M24LR04E-RUW20/2 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M24LR04E-RUW20/2 reliable?

The price and inventory of M24LR04E-RUW20/2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M24LR04E-RUW20/2 is usually 5 days.

3.What payment methods are accepted for M24LR04E-RUW20/2?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M24LR04E-RUW20/2 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M24LR04E-RUW20/2?

M24LR04E-RUW20/2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M24LR04E-RUW20/2 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M24LR04E-RUW20/2?

For technical support, including M24LR04E-RUW20/2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M24LR04E-RUW20/2 requirements.

6.How does Aetrix verify that M24LR04E-RUW20/2 is sourced from the original manufacturer or authorized distributors?

All M24LR04E-RUW20/2 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M24LR04E-RUW20/2 meets industry standards.

7.What is the process for return or replacement of M24LR04E-RUW20/2?

All M24LR04E-RUW20/2 units undergo pre-shipment inspection (PSI). If there is an issue with M24LR04E-RUW20/2, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M24LR04E-RUW20/2 part is unused and in its original packaging.

Return procedure for M24LR04E-RUW20/2:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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