STMicroelectronics ANT5-M24LR-A

Overview

ANT5-M24LR-A from STMicroelectronics is a ready-to-use 45 mm × 75 mm printed circuit board featuring four parallel-connected M24LR64-R Dual Interface EEPROM ICs, enabling 256 Kbit multibank memory evaluation via 13.56 MHz inductive RF coupling and I²C interface. It supports NFC Forum Type V tag operation with 64 Kbit per bank, 1.8–5.5 V supply, and -40°C to +85°C industrial temperature range.

For engineers reviewing the ANT5-M24LR-A datasheet, ANT5-M24LR-A pinout, ANT5-M24LR-A application, or ANT5-M24LR-A equivalent, this reference board delivers validated RF antenna geometry, I²C bus termination, and multibank memory mapping for rapid NFC-enabled system prototyping and interoperability testing with ISO/IEC 15693-compliant readers.

Technical Context

The board implements a fixed 4-bank memory architecture where each M24LR64-R operates independently over RF (ISO/IEC 15693) and concurrently over I²C, allowing simultaneous wireless read/write and wired host access. Antenna impedance is tuned to 50 Ω at 13.56 MHz with measured Q-factor >35 and read range up to 50 mm using standard NFC readers.

I²C interface conforms to SMBus v2.0 with 100 kHz/400 kHz modes, pull-up resistors pre-installed (4.7 kΩ), and address selection jumpers for multi-board daisy-chaining. No external power is required during RF operation - energy harvesting powers the EEPROMs directly from the RF field.

Key Specifications

Availability

ANT5-M24LR-A is available at Aetrix Electronics and suitable for NFC tag development, industrial asset identification, smart label validation, and dual-interface memory system integration requiring stable component supply and documented RF performance.

Supply support for ANT5-M24LR-A 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, designing and manufacturing microcontrollers, analog ICs, MEMS, and smart power devices for industrial, automotive, and consumer applications.

The ANT5-M24LR-A belongs to ST's NFC & RF product line, developed specifically to accelerate evaluation and adoption of dual-interface EEPROMs in contactless identification, maintenance logging, and secure data exchange systems.

FAQ

Is the ANT5-M24LR-A compatible with ISO/IEC 14443 readers?

No. The board implements ISO/IEC 15693 (vicinity) protocol only, not ISO/IEC 14443 (proximity). Its antenna geometry, modulation depth, and command set are optimized for 13.56 MHz readers supporting Type V tags, such as ST25R3911B-based systems. Attempting use with MIFARE or NFC-A readers will result in no response.

Can the four M24LR64-R ICs be accessed individually over I²C?

Yes - each IC has its own hardware-configurable I²C address via onboard solder jumpers. With unique addresses assigned, a host MCU can perform independent read/write operations to any single bank without affecting others, enabling true multibank memory management.

Does the board include firmware or require programming before use?

No firmware is preloaded or required. The M24LR64-R devices are blank EEPROMs at shipment. Users must initialize memory content and configure RF parameters (e.g., password protection, block locking) via I²C or RF commands using ST-provided demonstration software or custom host applications.

What is the maximum achievable RF read distance with this board?

Under controlled lab conditions using a 2 W ERP reader antenna and optimal alignment, the board achieves up to 50 mm read range. Real-world performance depends on reader sensitivity, antenna orientation, nearby metal/dielectric materials, and ambient RF noise - typical deployment range is 20–35 mm.