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STMicroelectronics ST25R3914-AQWT
- Part No.:
- ST25R3914-AQWT
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ST25R3914-AQWT.pdf
- Description:
- NFC / HF RFID READER IC FOR AUTO
- Quantity:
- Payment:
- Shipping:
Inventory:6,256
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Product details
Overview
ST25R3914-AQWT from STMicroelectronics is an AEC-Q100 Grade 1 qualified automotive NFC initiator/HF reader IC with integrated 1 W differential antenna driver, ISO 14443A/B/15693/FeliCa™ and NFCIP-1 Active P2P support, automatic antenna tuning (AAT), and capacitive wake-up sensing - deployed in vehicle access systems, e-key fob readers, and secure infotainment authentication.
For engineers reviewing the ST25R3914-AQWT datasheet, ST25R3914-AQWT pinout, ST25R3914-AQWT application, or ST25R3914-AQWT equivalent, key selection considerations include AAT capability, dual-antenna single-ended drive support, 6 Mbit/s SPI with 96-byte FIFO, -40 °C to +125 °C operation, and differential 1 Ω antenna driver architecture.
Technical Context
The ST25R3914-AQWT implements a dual-channel AM/PM (I/Q) demodulator with automatic mode selection and supports HBR framing up to 848 kbit/s in both PICC→PCD and PCD→PICC directions. Its analog front end includes automatic modulation index adjustment and user-selectable/automatic gain control for robust signal recovery across varying tag distances and coupling conditions.
It integrates a low-power capacitive sensor for card presence detection without RF field activation, plus amplitude/phase-based LC tank monitoring and a wake-up timer with RC oscillator - enabling ultra-low-power standby modes. The device accepts 13.56 MHz or 27.12 MHz crystals with fast start-up and operates from 2.4 V to 5.5 V supply with I/O tolerance down to 1.65 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | Up to 1 W differential output enables extended read range (>10 cm) with standard 13.56 MHz antennas in automotive environments. |
| Data Rate Support | HBR up to 848 kbit/s bidirectional framing compliant with ISO 18092 NFCIP-1 Active P2P mode. |
| Protocol Coverage | Fully integrated support for ISO 14443A/B, ISO 15693, FeliCa™, and NFCIP-1 - no external protocol stack required for standard operations. |
| Antenna Interface | Dual 1 Ω differential antenna drivers; supports two antennas in single-ended mode or one in differential mode with AAT. |
| Supply Range | 2.4 V to 5.5 V core supply; I/O pins tolerate 1.65 V to 5.5 V - compatible with mixed-voltage automotive MCU interfaces. |
| Temperature Range | -40 °C to +125 °C ambient operating range - certified AEC-Q100 Grade 1 for under-hood and cabin-mounted applications. |
| SPI Interface | 6 Mbit/s SPI with 96-byte FIFO reduces host MCU overhead and enables real-time tag response handling. |
Pinout & Package
ST25R3914-AQWT is housed in a VFQFPN32 package (5 mm × 5 mm, 0.5 mm pitch) with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core power supply input | Accepts 2.4–5.5 V; powers analog front end, digital logic, and antenna drivers. |
| VIO | I/O voltage reference | Configures logic level threshold (1.65–5.5 V) for SPI and control pins independent of VDD. |
| ANT1P / ANT1N | Differential antenna output channel 1 | Low-impedance (1 Ω) push-pull outputs for high-efficiency 13.56 MHz carrier generation. |
| ANT2P / ANT2N | Differential antenna output channel 2 | Enables dual-antenna operation or redundancy; supports single-ended drive via internal switching. |
| CSN / SCK / MOSI / MISO | SPI interface signals | 6 Mbit/s full-duplex interface with 96-byte FIFO; supports burst reads/writes and interrupt-driven operation. |
| WAKEUP | Capacitive sensor input | High-impedance analog input for proximity detection without RF field activation - reduces system standby current to µA range. |
| XTAL_IN / XTAL_OUT | Crystal oscillator terminals | Supports 13.56 MHz or 27.12 MHz fundamental-mode crystals with fast start-up (<100 µs). |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Antenna Tuning (AAT) | Real-time LC tank impedance compensation using internal DAC and feedback loop - maintains resonance stability across temperature, aging, and mechanical stress. |
| Capacitive Wake-up Sensing | Sub-10 µA standby current detection path that triggers full RF activation only upon valid card approach - extends battery life in keyless entry modules. |
| Dual Differential Antenna Drivers | Two independent 1 Ω drivers enable spatial diversity, fail-safe redundancy, or simultaneous multi-zone coverage in door handle or center console readers. |
| AM/PM (I/Q) Demodulation | Hardware-accelerated dual-path demodulation with automatic selection - eliminates need for external IQ mixer and improves immunity to phase noise and envelope distortion. |
| Transparent & Stream Modes | Direct AFE access allows custom framing implementation (e.g., MIFARE Classic) on host MCU while retaining analog performance and timing precision. |
Applications
| Vehicle Keyless Entry System | Automotive Infotainment Pairing |
|---|---|
Use Scenario: Passive detection of NFC-enabled smart keys near door handles or pillars without continuous RF transmission. IC Role / Device Role / Timing Role: Initiator IC performing capacitive wake-up → rapid antenna tuning → ISO 14443A authentication handshake within <150 ms. Use Value: Enables sub-100 µA average system standby current and <200 ms total unlock latency - meeting OEM ultra-low-power and responsiveness requirements. | Use Scenario: Tap-to-pair smartphones with in-vehicle head units for Android Auto or Apple CarPlay provisioning. IC Role / Device Role / Timing Role: NFCIP-1 Active P2P initiator establishing secure LLCP link and handover to Bluetooth/Wi-Fi using 848 kbit/s HBR framing. Use Value: Eliminates manual pairing steps and ensures deterministic connection setup time <300 ms - critical for driver distraction mitigation. |
| Secure ECU Diagnostic Port | Wireless Firmware Update Interface |
Use Scenario: Technician authentication and secure session establishment at OBD-II port using NFC-enabled diagnostic tool. IC Role / Device Role / Timing Role: ISO 14443B-compliant reader verifying cryptographically signed challenge-response tokens during physical port access. Use Value: Prevents unauthorized ECU reprogramming by binding authentication to hardware-bound keys - satisfies UNECE R155 cybersecurity compliance. | Use Scenario: Over-the-air firmware update initiation via NFC tap on vehicle display or charging pad. IC Role / Device Role / Timing Role: ISO 15693 reader validating update package signature and establishing encrypted stream mode transfer to microcontroller flash controller. Use Value: Enables authenticated, tamper-evident update trigger without requiring cellular or Wi-Fi connectivity - reducing attack surface and cloud dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NFC initiator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST25R3915-AQWT | 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 drift compensation is managed externally. | Select ST25R3915 only if AAT is unnecessary and AOI-compatible packaging is not required. |
| NXP PN7160 | Integrated ARM Cortex-M0 host processor; lower RF output (150 mW); no AAT or dual antenna drivers. | Designed for embedded host systems needing minimal external MCU involvement - not suitable for high-power or dual-antenna automotive use cases. | Choose PN7160 only when system-level integration (firmware, stack, power management) outweighs RF performance and automotive qualification needs. |
Compared with ST25R3915-AQWT and PN7160, the ST25R3914-AQWT uniquely delivers AEC-Q100 Grade 1 qualification, 1 W differential output, and hardware-based AAT - making it the sole option for automotive-grade, high-reliability, long-range NFC reader designs requiring zero-drift antenna tuning.
Availability
ST25R3914-AQWT is available at Aetrix Electronics and suitable for vehicle keyless entry systems, secure ECU diagnostics, and wireless firmware update interfaces requiring stable component supply across automotive production lifecycles.
Supply support for ST25R3914-AQWT 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 analog/mixed-signal products for automotive, industrial, and consumer markets.
The ST25R series targets automotive NFC infrastructure applications, emphasizing AEC-Q100 qualification, ultra-low-power wake-up, and high-output RF performance for secure, reliable short-range wireless communication in harsh environments.
FAQ
Does ST25R3914-AQWT support MIFARE Classic authentication natively?
No. It provides Transparent and Stream modes to expose raw AFE signals to an external microcontroller, enabling host-side implementation of MIFARE Classic framing and crypto operations. The IC itself does not embed MIFARE-specific protocol logic or cryptographic accelerators.
What is the function of the WAKEUP pin?
The WAKEUP pin is a dedicated high-impedance analog input for capacitive proximity sensing. It detects changes in parasitic capacitance caused by nearby objects (e.g., NFC cards), allowing the device to remain in ultra-low-power mode until a valid event triggers full RF activation - reducing average system current to below 10 µA.
Can ST25R3914-AQWT drive a single-ended antenna?
Yes. The IC supports single-ended antenna configuration using either ANT1P/ANT1N or ANT2P/ANT2N pair with internal switching. It also allows driving two separate single-ended antennas simultaneously - a capability confirmed in ST's AN4915 application note and validated in automotive door handle reference designs.
Is external crystal load capacitance specified for 13.56 MHz operation?
Yes. For 13.56 MHz fundamental-mode crystal operation, ST specifies 12 pF load capacitance. The oscillator circuit includes internal capacitors adjustable via register settings, and layout guidelines require symmetric trace routing and ground shielding per ST's UM2177 hardware design manual.
ST25R3914-AQWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ST25R
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- RFID Reader
- Frequency:
- 13.56MHz
- Standards:
- FeliCa, ISO 14443, ISO 15693, ISO 18092, MIFARE, NFC
- Interface:
- SPI
- Voltage - Supply:
- 2.4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-QFN (5x5)
ST25R3914-AQWT FAQ
1.How can I place an order for ST25R3914-AQWT through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25R3914-AQWT 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-AQWT reliable?
The price and inventory of ST25R3914-AQWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25R3914-AQWT is usually 5 days.
3.What payment methods are accepted for ST25R3914-AQWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25R3914-AQWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25R3914-AQWT?
ST25R3914-AQWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25R3914-AQWT 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-AQWT?
For technical support, including ST25R3914-AQWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25R3914-AQWT requirements.
6.How does Aetrix verify that ST25R3914-AQWT is sourced from the original manufacturer or authorized distributors?
All ST25R3914-AQWT 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-AQWT meets industry standards.
7.What is the process for return or replacement of ST25R3914-AQWT?
All ST25R3914-AQWT units undergo pre-shipment inspection (PSI). If there is an issue with ST25R3914-AQWT, 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-AQWT part is unused and in its original packaging.
Return procedure for ST25R3914-AQWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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