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ST25R3911B-AQFT

ST25R3911B-AQFT

STMicroelectronics
RFID Reader IC 13.56MHz ISO 14443, NFC SPI 2.4V ~ 5.5V 32-VFQFN Exposed Pad
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Overview

The ST25R3911B-AQFT is a high-performance 13.56MHz RFID and NFC front-end IC designed for high-power reader applications. It features an integrated automatic antenna tuning (AAT) system and provides up to 1.4W of output power to drive antennas directly without the need for an external booster. This IC is highly versatile, supporting multiple protocols including ISO 14443 A/B, ISO 15693, FeliCa, and NFC Forum types 1-5.

Why Choose This Part

The device excels in power efficiency and range thanks to its 1.4W maximum output power and capacitive wake-up feature, which consumes only 3.6uA in sleep mode. Engineering effort is reduced by the built-in automatic antenna tuning and dynamic power output (DPO), ensuring optimal performance even in changing environments or near metal. Its wide supply voltage range of 2.4V to 5.5V and high temperature rating up to 125degC make it suitable for both battery-powered and automotive applications.

Applications

Access Control Systems
Ideal for physical security readers that require long-range performance and reliable communication with passive cards and key fobs.
Contactless Payment Terminals
Used in EMVCo-compliant point-of-sale systems where high sensitivity and robust data rates are critical.
NFC Gateways
Enables smart home hubs or industrial controllers to act as NFC initiators for commissioning IoT devices.
Ticketing and Identity
Suitable for public transport validators and electronic identity verification stations requiring fast ISO 14443 transaction speeds.

Key Specifications

Type RFID Reader
Frequency 13.56MHz
Interface SPI
Standards ISO 14443, NFC
Mounting Type Surface Mount
Package / Case 32-VFQFN Exposed Pad
Voltage - Supply 2.4V ~ 5.5V
Operating Temperature -40degC ~ 125degC
Supplier Device Package 32-QFN (5x5)

Getting Started

Development can begin with the X-NUCLEO-NFC05A1 expansion board, which plugs into STM32 Nucleo-64 or Nucleo-144 development boards. STMicroelectronics provides the ST25 SDK and the ST25R3911B configuration tool to help engineers tune antenna matching and evaluate protocol performance. The SPI interface supports speeds up to 6 Mbit/s with a 96-byte FIFO for efficient data handling with a host microcontroller.

Also Consider

PN5180 NXP Semiconductors - Offers similar high-power output and advanced features like Dynamic Power Control (DPC) for EMVCo compliance.
TRF7970A TITexas Instruments - A well-established multi-protocol NFC/RFID transcveiver with a broad ecosystem of firmware libraries for low-power operation.