My Inquiry
My Account
STMicroelectronics ST25R3914-AQFT
- Part No.:
- ST25R3914-AQFT
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- -
- Datasheet:
-
ST25R3914-AQFT.pdf
- Description:
- IC RFID READER 13.56MHZ 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,838
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ST25R3914-AQFT from STMicroelectronics is an AEC-Q100 Grade 1 qualified automotive HF NFC initiator/reader IC supporting ISO 14443A/B, ISO 15693, FeliCa™, and ISO 18092 (NFCIP-1) active P2P at up to 848 kbit/s. It delivers up to 1 W RF output power in differential mode, integrates automatic antenna tuning (AAT), and operates across –40 °C to +125 °C for under-hood or infotainment gateway applications.
For engineers reviewing the ST25R3914-AQFT datasheet, ST25R3914-AQFT pinout, ST25R3914-AQFT application, or ST25R3914-AQFT equivalent, key selection criteria include AAT capability, dual-antenna support in single-ended mode, capacitive wake-up sensing, 6 Mbit/s SPI with 96-byte FIFO, and 2.4–5.5 V supply operation with 1.65–5.5 V I/O tolerance.
Technical Context
The ST25R3914-AQFT implements a dual-channel AM/PM (I/Q) demodulator with automatic channel selection and supports both Transparent and Stream framing modes-enabling external MCU-based protocol handling (e.g., MIFARE Classic). Its analog front end includes two 1 Ω low-impedance differential antenna drivers, enabling direct drive of high-efficiency LC tanks without external matching networks.
It embeds a low-power capacitive sensor for card-detection wake-up, plus amplitude/phase-based detection on the antenna tank, and integrates a low-power RC oscillator with programmable wake-up timer. The device accepts 13.56 MHz or 27.12 MHz crystals with fast start-up, and supports automatic modulation index adjustment for robust communication across varying tag distances and orientations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Output Power | Up to 1 W differential output enables extended read range (>10 cm) with standard 13.56 MHz antennas in automotive environments. |
| Communication Protocols | Fully supports ISO 14443A/B, ISO 15693, FeliCa™, and ISO 18092 (NFCIP-1) active P2P - no external protocol accelerator required. |
| Data Rate (PICC↔PCD) | Up to 848 kbit/s HBR framing in both directions ensures fast data exchange for secure access or firmware update use cases. |
| Supply Voltage Range | 2.4 V to 5.5 V operation with 1.65–5.5 V I/O tolerance allows direct integration into 3.3 V or 5 V automotive domain controllers. |
| Temperature Range | –40 °C to +125 °C ambient rating meets AEC-Q100 Grade 1 requirements for engine bay or dashboard-mounted modules. |
| SPI Interface | 6 Mbit/s SPI with 96-byte FIFO reduces host MCU overhead and enables deterministic real-time response in safety-critical systems. |
Pinout & Package
ST25R3914-AQFT is housed in a VFQFPN32 package (5 mm × 5 mm) with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply input | Accepts 2.4–5.5 V; powers analog and digital blocks; requires local 100 nF + 1 µF decoupling. |
| ANT1P / ANT1N | Differential antenna output #1 | Low-impedance (1 Ω) differential driver pair; supports up to 1 W output into 50 Ω balanced load. |
| ANT2P / ANT2N | Differential antenna output #2 | Second independent 1 Ω differential driver; enables dual-antenna systems without external switches. |
| CSN | SPI chip select input | Active-low signal enabling SPI communication; supports multi-device bus sharing with hardware arbitration. |
| IRQ | Interrupt request output | Open-drain signal indicating event completion (e.g., tag detected, frame received, error condition). |
| WAKEUP | Capacitive sensor input | Configurable as capacitive sense pad input; triggers low-power wake-up when card proximity exceeds threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Antenna Tuning (AAT) | Real-time LC tank impedance compensation via internal DAC and feedback loop - maintains resonance stability despite temperature drift or mechanical stress. |
| Dual Differential Antenna Drivers | Two independent 1 Ω drivers eliminate need for external baluns or matching networks, reducing BOM count and PCB area in multi-zone reader designs. |
| Capacitive Wake-Up Sensing | Sub-10 µA standby current detection path enables >100 ms wake-up latency control and eliminates continuous RF field generation during idle periods. |
| AM/PM (I/Q) Demodulation | Hardware-selectable dual demodulation paths improve immunity to near-field interference and enable reliable decoding under metallic or noisy automotive conditions. |
Applications
| Automotive Keyless Entry | Secure Infotainment Pairing |
|---|---|
Use Scenario: Passive entry/start system where vehicle detects authorized fob within 1.5 m using low-power wake-up and rapid ISO 14443A handshaking. IC Role / Device Role / Timing Role: Initiator IC generating controlled 13.56 MHz field, performing anti-collision, and exchanging encrypted challenge-response frames. Use Value: AAT compensates for antenna detuning caused by door panel materials; 1 W output ensures consistent range across temperature extremes. | Use Scenario: Smartphone-to-vehicle pairing for Android Auto or Apple CarPlay via NFC tap-to-connect. IC Role / Device Role / Timing Role: NFCIP-1 active P2P initiator establishing bidirectional 848 kbit/s link with mobile device for session key exchange. Use Value: Dual I/Q demodulation ensures robust link establishment in presence of EMI from infotainment power supplies and displays. |
| Vehicle-to-Vehicle Data Exchange | Automotive Diagnostic Port Reader |
Use Scenario: Short-range wireless transfer of calibration data or firmware patches between service tools and ECUs during maintenance. IC Role / Device Role / Timing Role: ISO 15693 reader initiating high-speed block reads/writes to service tool tags at up to 26.48 kbit/s. Use Value: 6 Mbit/s SPI interface synchronizes tag data transfer with host MCU DMA, minimizing CPU load during large file transfers. | Use Scenario: OBD-II port-integrated NFC reader enabling technician authentication and secure diagnostic session initiation. IC Role / Device Role / Timing Role: ISO 14443B initiator verifying technician badge credentials before granting access to UDS or DoIP services. Use Value: Wide 2.4–5.5 V supply range allows direct connection to OBD-II pin 16 (battery) and pin 4 (chassis ground) without LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar HF NFC initiator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST25R3915-AQFT | Same die, QFN32 package without wettable flanks; lacks AAT circuitry and automatic modulation index adjustment. | Targeted at cost-sensitive non-automotive industrial readers where antenna stability is managed externally. | Select ST25R3915 only if AAT is unnecessary and AOI compatibility is not required. |
| NXP PN7462AU | Integrated ARM Cortex-M0+ MCU; supports embedded firmware but lower max RF output (500 mW); no AAT or dual antenna drivers. | Best suited for compact standalone NFC terminals requiring on-chip protocol stack execution, not high-power automotive infrastructure. | Choose PN7462AU only when embedded processing and smaller footprint outweigh RF performance and automotive qualification needs. |
Compared with ST25R3914-AQFT, ST25R3915-AQFT sacrifices AAT and wettable flanks for lower cost, while PN7462AU trades raw RF capability and automotive qualification for integrated processing - making ST25R3914-AQFT uniquely suited for high-reliability, high-output automotive reader nodes.
Availability
ST25R3914-AQFT is available at Aetrix Electronics and suitable for automotive keyless entry systems, secure infotainment pairing interfaces, and vehicle diagnostic port readers requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for ST25R3914-AQFT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and connectivity solutions for automotive, industrial, and consumer markets.
The ST25R series targets high-performance, automotive-grade NFC infrastructure - engineered specifically for robust HF reader functionality in harsh environments with minimal external components and maximum RF efficiency.
FAQ
Does ST25R3914-AQFT support MIFARE Classic encryption?
No, ST25R3914-AQFT does not perform MIFARE Classic cryptographic operations internally. It provides Transparent and Stream modes to pass raw RF frames to an external host MCU, which must implement the Crypto1 algorithm and authentication sequence per NXP specification.
What crystal frequencies are supported for the oscillator input?
The ST25R3914-AQFT oscillator input supports either 13.56 MHz or 27.12 MHz fundamental-mode crystals. Both enable fast start-up and stable operation; 27.12 MHz allows internal frequency division to generate precise 13.56 MHz carrier with reduced EMI.
Can ST25R3914-AQFT drive a single-ended antenna?
Yes - it supports single-ended antenna configuration using one differential pair (e.g., ANT1P/ANT1N) with external balun or center-tapped transformer. The datasheet specifies layout guidelines and matching network values for 50 Ω single-ended loads.
Is automatic antenna tuning (AAT) enabled by default after power-up?
No - AAT requires explicit initialization via SPI register writes (e.g., enabling AAT_EN bit in REG_AAT_CTRL) and calibration sequence execution. Default state disables AAT; user firmware must configure and trigger tuning before RF transmission.
ST25R3914-AQFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ST25R
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- RFID Reader
- Frequency:
- 13.56MHz
- Standards:
- ISO 14443, ISO 15693
- Interface:
- -
- Voltage - Supply:
- 2.4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ST25R3914-AQFT FAQ
1.How can I place an order for ST25R3914-AQFT through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25R3914-AQFT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ST25R3914-AQFT reliable?
The price and inventory of ST25R3914-AQFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25R3914-AQFT is usually 5 days.
3.What payment methods are accepted for ST25R3914-AQFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25R3914-AQFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25R3914-AQFT?
ST25R3914-AQFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25R3914-AQFT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ST25R3914-AQFT?
For technical support, including ST25R3914-AQFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25R3914-AQFT requirements.
6.How does Aetrix verify that ST25R3914-AQFT is sourced from the original manufacturer or authorized distributors?
All ST25R3914-AQFT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ST25R3914-AQFT meets industry standards.
7.What is the process for return or replacement of ST25R3914-AQFT?
All ST25R3914-AQFT units undergo pre-shipment inspection (PSI). If there is an issue with ST25R3914-AQFT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ST25R3914-AQFT part is unused and in its original packaging.
Return procedure for ST25R3914-AQFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST25R3914-AQFT Tags
-
SL2S2602FTBX
NXP Semiconductors
-
ST25DV04K-IER6S3
STMicroelectronics
-
ST25DV04K-IER6C3
STMicroelectronics
-
LXMSJZNCMD-217
Murata Electronics
-
NT3H2111W0FTTJ
NXP Semiconductors
-
NT3H2111W0FHKH
NXP Semiconductors
-
M24LR04E-RMC6T/2
STMicroelectronics
-
ST25DV04KC-JF6D3
STMicroelectronics
-
ST25DV64KC-IE6S3
STMicroelectronics
-
ST25DV64K-IER6T3
STMicroelectronics
-
NT3H2211W0FTTJ
NXP Semiconductors
-
NT3H2211W0FHKH
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
