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HF 13.56 MHzSTMicroelectronics

ST25R3911B

The STMicroelectronics ST25R3911B is an reader IC, with N/A (reader IC without user memory), operating at 13.56 MHz, under ISO/IEC 14443-A, ISO/IEC 14443-B, ISO/IEC 15693, FeliCa, NFC-A, NFC-B, NFC-F NFC-V.

High-performance HF reader IC supporting ISO/IEC 14443 A/B, 15693, FeliCa with up to 1.4 W RF output.

Official Datasheet ↗
Frequency
13.56 MHz
Protocol
ISO/IEC 14443-A, ISO/IEC 14443-B, ISO/IEC 15693, FeliCa, NFC-A, NFC-B, NFC-F, NFC-V
Memory
N/A (reader IC without user memory)
Interface
SPI, I2C optional
Temp Range
-40°C to +85°C
Form Factor
TQFP32, HVQFN32

Full Specifications

ManufacturerSTMicroelectronics
Frequency CategoryHF 13.56 MHz
Frequency13.56 MHz
ProtocolISO/IEC 14443-A, ISO/IEC 14443-B, ISO/IEC 15693, FeliCa, NFC-A, NFC-B, NFC-F, NFC-V
MemoryN/A (reader IC without user memory)
InterfaceSPI, I2C optional
Temperature Range-40°C to +85°C
Form FactorTQFP32, HVQFN32
SecurityAAT (Antenna tuning anti-tamper), PRNG (Pseudo Random Number Generator), collision avoidance

Engineering Brief

The ST25R3911B is a high-performance HF reader/writer IC from STMicroelectronics designed for 13.56 MHz RFID and NFC applications. It supports multiple protocols including ISO/IEC 14443-A/B, ISO/IEC 15693, and FeliCa, with configurable RF output power up to 1.4 W for extended read range. The device features advanced analog front-end circuitry, automatic antenna tuning, and low power consumption modes. It interfaces with host microcontrollers via SPI (and optional I2C) and includes integrated EMI suppression and active wave shaping for regulatory compliance.

Typical Applications

Standards & Compliance

Frequently Asked Questions

What is the maximum RF output power of the ST25R3911B?

The ST25R3911B delivers up to 1.4 W of configurable RF output power, enabling extended read ranges for demanding HF RFID and NFC applications.

Which NFC and RFID protocols does the ST25R3911B support?

The ST25R3911B supports ISO/IEC 14443-A, ISO/IEC 14443-B, ISO/IEC 15693, FeliCa, and all corresponding NFC modes (NFC-A, NFC-B, NFC-F, NFC-V), making it a multi-protocol reader solution.

How does the ST25R3911B interface with a microcontroller?

The ST25R3911B interfaces with host microcontrollers via SPI as the primary interface, with optional I2C support for flexible system integration.

Does the ST25R3911B have built-in antenna tuning?

Yes, the ST25R3911B features automatic antenna tuning (AAT) with anti-tamper protection, optimizing antenna matching and improving system performance while detecting tampering attempts.

What security features are included in the ST25R3911B?

The ST25R3911B includes a Pseudo Random Number Generator (PRNG) for cryptographic operations, collision avoidance mechanisms, and antenna tuning anti-tamper (AAT) detection for enhanced security.

Is the ST25R3911B suitable for long-range RFID reading applications?

Yes, with its high 1.4 W RF output power and advanced analog front-end, the ST25R3911B is designed for extended read range applications in access control, industrial automation, and library systems.

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Manufacturer
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Standards
Applications

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