NFC / HF RFID Reader IC for Automotive

The ST25R3914/5 are highly integrated NFC Initiators / HF Reader ICs for automotive applications, AEC-Q100 grade 1 qualified, 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) 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 ST25R3914/5 are 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 technology, the devices are optimized for applications with directly driven antennas. The ST25R3914/5 are alone in the domain of HF reader ICs as they contain two differential low impedance (1 Ohm) antenna drivers.

The ST25R3914/5 include several features that make them very suited for low power applications. They contain 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. They also contain 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 ST25R3914/5 are 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

  • AEC-Q100 qualified
  • ISO 18092 (NFCIP-1) Active P2P
  • ISO14443A, ISO14443B and FeliCa™
  • Support HBR up to 848 kbit/s PICC to PCD and PCD to PICC framing
  • Capacitive sensing - Wake-up
  • Automatic antenna tuning system providing tuning of antenna LC tank (ST25R3914 only)
  • Automatic modulation index adjustment
  • AM and PM (I/Q) demodulator channels with automatic selection
  • Up to 1 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


Technical Documentation

Product Specifications
Description Version Size
DB3075 DB3075: Automotive high performance reader / NFC initiator with 1 W output power 1.0 58 KB
Application Notes
Description Version Size
AN4974 AN4974: Antenna matching for ST25R3911B/ST25R391x devices 2.0 3 MB
AN4914 AN4914: Automatic Antenna Tuning (AAT) of ST25R3911B/ST25R391x devices 2.0 1 MB
AN5043 AN5043: Layout recommendations for the design of boards with ST25R3911B/ST25R391x devices 4.0 873 KB
AN4985 AN4985: Wake-up mode of the ST25R3911B/ST25R391x 1.0 805 KB

Presentations & Training Material

Description Version Size
ST25R series overview 1.0 3 MB

Publications and Collaterals

Description Version Size
Automotive NFC/HF readers 1.0 933 KB
High performance NFC/RFID readers 1.0 981 KB
Description Version Size
NFC solutions from ST 1.0 3 MB

Tools and Software

Embedded Software
ST25 - NFC / RFID Software
Support & Community

Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
ST25R3914-AQFT VFQFPN 5X5 32L PAD 3.5X3 PUNCHED Tape And Reel Active 3.8 1000 NEC EAR99 - MORE INFO No availability reported, please contact our Sales office
ST25R3914-AQWT VFQFPN 5X5X1 32L WETTABLE FLANKS Tape And Reel Preview - - NEC EAR99 - MORE INFO No availability reported, please contact our Sales office

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ST25R3914-AQFT ActiveVFQFPN 5X5 32L PAD 3.5X3 PUNCHEDIndustrialN/A 0 0
ST25R3914-AQWT PreviewVFQFPN 5X5X1 32L WETTABLE FLANKSIndustrialEcopack2 0 0

(**) The Material Declaration forms available on 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.