ST25R3911B

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NFC / HF RFID Reader IC

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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 FeliCa™ reader. Implementation of other standard and custom protocols like MIFARE™ 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.

    Key Features

    • ISO 18092 (NFCIP-1) Active P2P
    • ISO14443A, ISO14443B, ISO15693 and FeliCa™
    • 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 MIFARE™ 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, 5 mm x 5 mm package

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ST25R3911B-AQFT VFQFPN 5X5 32L PAD 3.5X3 PUNCHED Tape And Reel
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2.8 1000 EAR99 TAIWAN Check Availability

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AVNET AMERICA 8000 0 Order Now
FUTURE WORLDWIDE 16000 4000 Order Now
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MOUSER WORLDWIDE 6955 1 Order Now
RUTRONIK EUROPE 6312 1 Order Now

Distributor reported inventory date: 2019-12-10

Distributor Name

AVNET

Stock

8000

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0

Region

AMERICA Order Now

FUTURE

Stock

16000

Min.Order

4000

Region

WORLDWIDE Order Now

ARROW

Stock

10497

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6955

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1

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WORLDWIDE Order Now

RUTRONIK

Stock

6312

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1

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EUROPE Order Now

Distributor reported inventory date: 2019-12-10

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ST25R3911B-AQWT VFQFPN 5X5X1 32L WETTABLE FLANKS Tape And Reel
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2.8 1000 EAR99 - No availability of distributors reported, please contact our sales office
ST25R3911B-ASWB US WF V.I. Not Applicable
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2.6 1000 EAR99 - No availability of distributors reported, please contact our sales office

ST25R3911B-AQFT

Package

VFQFPN 5X5 32L PAD 3.5X3 PUNCHED

Packing Type

Tape And Reel

Unit Price (US$)

2.8*

Distributor availability ofST25R3911B-AQFT

Distributor Name
Region Stock Min. Order Third party link
AVNET AMERICA 8000 0 Order Now
FUTURE WORLDWIDE 16000 4000 Order Now
ARROW EUROPE 10497 0 Order Now
MOUSER WORLDWIDE 6955 1 Order Now
RUTRONIK EUROPE 6312 1 Order Now

Distributor reported inventory date: 2019-12-10

Distributor Name

AVNET

Stock

8000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

16000

Min.Order

4000

Region

WORLDWIDE Order Now

ARROW

Stock

10497

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6955

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

6312

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-10

Marketing Status

Active

Unit Price (US$)

2.8

Quantity

1000

ECCN (US)

EAR99

Country of Origin

TAIWAN

ST25R3911B-AQWT

Package

VFQFPN 5X5X1 32L WETTABLE FLANKS

Packing Type

Tape And Reel

Unit Price (US$)

2.8*

Marketing Status

Preview

Unit Price (US$)

2.8

Quantity

1000

ECCN (US)

EAR99

Country of Origin

-

ST25R3911B-ASWB

Package

US WF V.I.

Packing Type

Not Applicable

Unit Price (US$)

2.6*

Marketing Status

Active

Unit Price (US$)

2.6

Quantity

1000

ECCN (US)

EAR99

Country of Origin

-

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Ecosystems

    • Part Number

      NFC card reader expansion board based on ST25R3911B for STM32 and STM8 Nucleos

Embedded Software

    • Part Number

      Windows® PC software for ISO15693, ISO14443-A/B, NFC and industrial readers

      PC software installer for ST25R3911B-DISCO

      Sources of STM32L4 based firmware for ST25R3911B-DISCO

      Antenna Matching Tool for ST25R NFC/HF reader family

      Linux demo of ST25R3911B for Raspberry Pi using X-NUCLEO-NFC05A1

      RFAL for ST25R3911B

      Sources of STM8 firmware for X-NUCLEO-NFC05A1 NFC/RFID HF reader expansion board

Evaluation Tools

    • Part Number

      Discovery kit for ST25R3911B high performance HF reader / NFC initiator with 1.4 W output power, VHBR and AAT

      EMVCo reference design for the ST25R3911B high performance HF reader

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS11793
      High performance HF reader / NFC initiator with 1.4 W supporting VHBR and AAT
      5.0
      1.61 MB
      PDF
      DS11793

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

    • Description Version Size Action
      AN4974
      Antenna matching for ST25R3911B/ST25R391x devices
      2.0
      3 MB
      PDF
      AN4914
      Automatic Antenna Tuning (AAT) of ST25R3911B/ST25R391x devices
      2.0
      1.9 MB
      PDF
      AN5364
      How to protect ST25 tags from wireless power charging
      2.1
      844.22 KB
      PDF
      AN5043
      Layout recommendations for the design of boards with ST25R3911B/ST25R391x devices
      4.0
      873.78 KB
      PDF
      AN5309
      ST25R3911B to ST25R3916 migration guide
      1.0
      217.33 KB
      PDF
      AN4985
      Wake-up mode of the ST25R3911B/ST25R391x
      1.0
      805.57 KB
      PDF
      AN4974

      Antenna matching for ST25R3911B/ST25R391x devices

      AN4914

      Automatic Antenna Tuning (AAT) of ST25R3911B/ST25R391x devices

      AN5364

      How to protect ST25 tags from wireless power charging

      AN5043

      Layout recommendations for the design of boards with ST25R3911B/ST25R391x devices

      AN5309

      ST25R3911B to ST25R3916 migration guide

      AN4985

      Wake-up mode of the ST25R3911B/ST25R391x

    • Description Version Size Action
      AN5276
      Antenna design for ST25R3916
      2.0
      2.75 MB
      PDF
      AN4974
      Antenna matching for ST25R3911B/ST25R391x devices
      2.0
      3 MB
      PDF
      AN4914
      Automatic Antenna Tuning (AAT) of ST25R3911B/ST25R391x devices
      2.0
      1.9 MB
      PDF
      AN5322
      ST25R3916 automatic antenna tuning (AAT)
      1.0
      1.08 MB
      PDF
      AN5276

      Antenna design for ST25R3916

      AN4974

      Antenna matching for ST25R3911B/ST25R391x devices

      AN4914

      Automatic Antenna Tuning (AAT) of ST25R3911B/ST25R391x devices

      AN5322

      ST25R3916 automatic antenna tuning (AAT)

Presentations & Training Material

    • Description Version Size Action
      ST253911B-15 Product Presentation 1.0
      3.4 MB
      PDF

      ST253911B-15 Product Presentation

Publications and Collaterals

    • Description Version Size Action
      High performance NFC/RFID readers 1.0
      981.89 KB
      PDF

      High performance NFC/RFID readers

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF
      NFC solutions from ST 1.0
      3.53 MB
      PDF

      Electric vehicle (EV) ecosystem

      NFC solutions from ST

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST25R3911B-AQFT
Active
VFQFPN 5X5 32L PAD 3.5X3 PUNCHED Industrial Ecopack2
ST25R3911B-AQWT
Preview
VFQFPN 5X5X1 32L WETTABLE FLANKS Industrial Ecopack2
ST25R3911B-ASWB
Active
US WF V.I. Industrial N/A

ST25R3911B-AQFT

Package:

VFQFPN 5X5 32L PAD 3.5X3 PUNCHED

Material Declaration**:

PDF XML

Marketing Status

Active

Package

VFQFPN 5X5 32L PAD 3.5X3 PUNCHED

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST25R3911B-AQWT

Package:

VFQFPN 5X5X1 32L WETTABLE FLANKS

Material Declaration**:

PDF XML

Marketing Status

Preview

Package

VFQFPN 5X5X1 32L WETTABLE FLANKS

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ST25R3911B-ASWB

Package:

US WF V.I.

Material Declaration**:

Marketing Status

Active

Package

US WF V.I.

Grade

Industrial

RoHS Compliance Grade

N/A

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

Step 1: Purchase Discovery kit, Nucleo board or Evaluation board

X-NUCLEO-NFC05A1

NFC card reader expansion board based on ST25R3911B for STM32 and STM8 Nucleos

ST25R3911B-DISCO

Discovery kit for ST25R3911B high performance HF reader / NFC initiator with 1.4 W output power, VHBR and AAT

ST25R3911B-EMVCO

EMVCo reference design for the ST25R3911B high performance HF reader

Step 2: Download associated software

X-CUBE-NFC5

High performance HF reader/NFC initiator IC software expansion for STM32Cube

STSW-ST25PC001

Windows® PC software for ISO15693, ISO14443-A/B, NFC and industrial readers

STSW-ST25R001

PC software installer for ST25R3911B-DISCO

STSW-ST25R002

Sources of STM32L4 based firmware for ST25R3911B-DISCO

STSW-ST25R004

Antenna Matching Tool for ST25R NFC/HF reader family

STSW-ST25R009

Linux demo of ST25R3911B for Raspberry Pi using X-NUCLEO-NFC05A1

Step 3: Get trained

ST253911B-15 Product Presentation

ST253911B-15 Product Presentation

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