ST25R3911B-AQFT ST25 NFC / RFID Tags & Readers by STMicroelectronics

High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT

Status: Active
Series: ST25R3911B
RoHS: Compliant
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The ST25R3911B is a highly integrated NFC Initiator / HF reader IC, including the analog front end (AFE) and a highly integrated data framing system for ISO 18092 (NFCIP-1) initiator, ISO 18092 (NFCIP-1) active target, ISO 14443A and B reader (including high bit rates), ISO 15693 reader and FeliCaâ„¢ reader. Implementation of other standard and custom protocols like MIFAREâ„¢ Classic is possible using the AFE and implementing framing in the external microcontroller (Stream and Transparent modes). The ST25R3911B is positioned perfectly for the infrastructure side of the NFC system, where users need optimal RF performance and flexibility combined with low power. Thanks to automatic antenna tuning (AAT) technology, the device is optimized for applications with directly driven antennas. The ST25R3911B is alone in the domain of HF reader ICs as it contains two differential low impedance (1 Ohm) antenna drivers. The ST25R3911B includes several features that make it very suited for low power applications. It contains a low power capacitive sensor that can be used to detect the presence of a card without switching on the reader field. The presence of a card can also be detected by performing a measurement of amplitude or phase of signal on antenna LC tank, and comparing it to the stored reference. It also contains a low power RC oscillator and wake-up timer that can be used to wake up the system after a defined time period, and to check for the presence of a tag using one or more low power detection techniques (capacitive, phase or amplitude). The ST25R3911B is designed to operate from a wide (2.4 V to 5.5 V) power supply range; peripheral interface IO pins support power supply range from 1.65 V to 5.5 V.

Where to Buy

Prices starting from US$3.02

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RS
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Future Electronics
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196,000
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Avnet America
from US$3.19
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Avnet Silica
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Newark Electronics
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Farnell
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EBV Elektronik
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Features

ISO 18092 (NFCIP-1) Active P2P
ISO14443A, ISO14443B, ISO15693 and FeliCaâ„¢
Supports VHBR (3.4 Mbit/s PICC to PCD framing, 6.8 Mbit/s AFE and PCD to PICC framing)
Capacitive sensing - Wake-up
Automatic antenna tuning system providing tuning of antenna LC tank
Automatic modulation index adjustment
AM and PM demodulator channels with automatic selection
DPO (Dynamic power output)
Up to 1.4 W in case of differential output
User selectable and automatic gain control
Transparent and stream modes to implement MIFAREâ„¢ classic compliant or other custom protocols
Possibility of driving two antennas in single ended mode
Oscillator input capable of operating with 13.56 MHz or 27.12 MHz crystal with fast start-up
6 Mbit/s SPI with 96 bytes FIFO
Wide supply voltage range from 2.4 V to 5.5 V
Wide temperature range: -40 °C to 125 °C
QFN32, 5x5 mm package with wetable flank or wafer delivery

Resources







Alternative Descriptions

ST25R3911B Series 5.5 V 13.56 MHz SMT High performance HF reader- QFN-32 | Future Electronics
NFC Reader 13.56MHz 12.5mA 32-Pin QFN T/R | Avnet America
ST25R3911B-AQFT, RF Transceivers | RS
Memory |Stmicroelectronics ST25R3911B-AQFT | Newark Electronics
RFID READER, 13.56MHZ, QFN-32 | Farnell


Frequently Asked Questions

Where can I find additional details, specifications and documents for a ST25R3911B-AQFT?

Additional datasheets, footprints and schematics for ST25R3911B-AQFT are listed on our Part Details page. You can also find images and similar parts to ST25R3911B-AQFT on this page.

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What category does ST25R3911B-AQFT fall under?

The ST25R3911B-AQFT is listed under NFC > ST25 NFC / RFID Tags & Readers > ST25 NFC / RFID Readers > ST25 NFC Readers.

Can I view similar or alternative parts?

You can view similar parts to ST25R3911B-AQFT when available in the ST25 NFC Readers range under the specifications section at the bottom of the details page.

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Is the ST25R3911B-AQFT RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

Which authorised distributors for ST25R3911B-AQFT have stock available?

Authorised distributors including Future Electronics, Avnet America, RS, Avnet Silica and Newark Electronics have stock available or on a lead time for ST25R3911B-AQFT.

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