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STMicroelectronics ST25R3915-AQWT
- Part No.:
- ST25R3915-AQWT
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ST25R3915-AQWT.pdf
- Description:
- NFC / HF RFID READER IC FOR AUTO
- Quantity:
- Payment:
- Shipping:
Inventory:4,445
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Product details
Overview
ST25R3915-AQWT 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, features dual low-impedance (1 Ω) antenna drivers, and operates across –40 °C to +125 °C with 2.4–5.5 V supply. Used in automotive keyless entry, secure vehicle access, and contactless authentication systems.
For engineers reviewing the ST25R3915-AQWT datasheet, ST25R3915-AQWT pinout, ST25R3915-AQWT application, or ST25R3915-AQWT equivalent, key selection criteria include AEC-Q100 qualification, 1 W RF output capability, dual-antenna support in single-ended mode, capacitive wake-up sensing, and SPI interface with 96-byte FIFO for real-time framing control in automotive NFC infrastructure.
Technical Context
The ST25R3915 integrates a fully autonomous analog front end (AFE) with AM and PM (I/Q) demodulator channels and automatic modulation index adjustment. Its dual 1 Ω differential antenna drivers enable high-efficiency RF transmission while supporting HBR framing up to 848 kbit/s in both PICC→PCD and PCD→PICC directions per ISO 18092.
It implements low-power card detection via capacitive sensing, amplitude/phase-based LC tank monitoring, and a dedicated RC oscillator with wake-up timer. The device supports transparent and stream modes for external microcontroller–based protocol handling (e.g., MIFARE Classic), and accepts 13.56 MHz or 27.12 MHz crystals with fast start-up.
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 antennas in automotive environments. |
| Operating Temperature | –40 °C to +125 °C meets AEC-Q100 Grade 1 requirements for under-hood and cabin-mounted NFC readers. |
| Supply Voltage Range | 2.4 V to 5.5 V supports direct connection to automotive battery rails and LDO outputs without level-shifting. |
| SPI Interface | 6 Mbit/s with 96-byte FIFO reduces host MCU overhead during high-speed tag communication and framing. |
| Antenna Drivers | Dual 1 Ω low-impedance differential drivers allow independent or parallel antenna operation with minimal matching loss. |
| Wake-up Sensing | Capacitive sensor + LC tank amplitude/phase measurement enables sub-100 µA standby current for always-on presence detection. |
Pinout & Package
ST25R3915-AQWT is housed in a 32-pin QFN 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 | Main power supply input | Accepts 2.4–5.5 V; powers analog and digital blocks; requires local 100 nF + 1 µF decoupling. |
| VDDIO | I/O power supply | Independent 1.65–5.5 V rail for SPI and GPIO logic compatibility with diverse host MCUs. |
| ANT1P / ANT1N | Differential antenna port 1 | Low-impedance (1 Ω) differential output pair; supports up to 1 W RF power into 50 Ω load. |
| ANT2P / ANT2N | Differential antenna port 2 | Second independent 1 Ω differential driver; enables dual-antenna switching or diversity reception. |
| CSN | SPI chip select | Active-low signal enabling SPI communication; supports multi-device bus sharing with hardware arbitration. |
| SCLK / MOSI / MISO | SPI clock/data lines | 6 Mbit/s full-duplex interface with 96-byte FIFO; minimizes host interrupt frequency during burst transfers. |
| WAKE | Capacitive wake-up input | Configurable as analog input for proximity detection; triggers internal wake-up sequence without RF activation. |
| XTAL_IN / XTAL_OUT | Crystal oscillator terminals | Supports 13.56 MHz or 27.12 MHz fundamental-mode crystals; fast start-up (<100 µs) enables rapid field activation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across –40 °C to +125 °C ambient, including thermal cycling and vibration stress testing. |
| Automatic antenna tuning (AAT) | Compensates for antenna detuning due to temperature drift or nearby metal; maintains optimal power transfer without external calibration. |
| Dual independent antenna drivers | Enables simultaneous or alternating antenna operation-critical for directional sensing and interference mitigation in vehicle door handles. |
| Capacitive + LC-tank wake-up | Reduces average system current to <100 µA in standby; eliminates need for mechanical switches or external sensors in passive entry systems. |
| HBR support up to 848 kbit/s | Meets NFC Forum Active Mode requirements for fast peer-to-peer handover and secure element provisioning in <100 ms. |
Applications
| Automotive Keyless Entry | Secure Vehicle Access Control |
|---|---|
Use Scenario: Driver approaches vehicle with NFC-enabled fob or smartphone; reader detects presence and initiates authentication handshake. IC Role / Device Role / Timing Role: Acts as the HF initiator in the vehicle-side NFC infrastructure, managing RF field generation, tag polling, and secure frame exchange. Use Value: Dual antenna drivers enable spatial discrimination between left/right doors; AAT ensures consistent read performance despite temperature-induced antenna drift. | Use Scenario: Authorized user taps NFC token on dashboard reader to unlock trunk or start engine without physical key insertion. IC Role / Device Role / Timing Role: Serves as ISO 14443A/B and FeliCa™ compliant reader for secure credential validation and session key establishment with embedded SE or eUICC. Use Value: 1 W RF output extends operational range to ≥8 cm through thick dash materials; capacitive wake-up reduces system idle power by >95%. |
| NFC-Based Digital Car Key | Automotive Service & Diagnostics |
Use Scenario: Smartphone with certified digital car key app communicates with vehicle's NFC reader to authenticate and authorize driving privileges. IC Role / Device Role / Timing Role: Implements ISO 18092 (NFCIP-1) active P2P mode with HBR (848 kbit/s) for fast, bidirectional data exchange during key provisioning and challenge-response. Use Value: Stream mode allows host MCU to handle custom cryptographic framing while ST25R3915 manages precise RF timing and demodulation. | Use Scenario: Technician places NFC-enabled diagnostic tool near service port to initiate secure firmware update or ECU configuration. IC Role / Device Role / Timing Role: Functions as high-reliability ISO 15693 reader for long-range (up to 1 m with tuned antenna) identification of service tags and secure channel setup. Use Value: Wide supply range (2.4–5.5 V) accommodates portable tool battery voltage sag; –40 °C to +125 °C rating ensures operation in engine bay diagnostics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NFC initiator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST25R3914-AQWT | Includes integrated automatic antenna tuning (AAT); same pinout and electrical specs except AAT block presence. | Preferred where antenna detuning compensation is required without external tuning circuitry or MCU intervention. | Select ST25R3914 if AAT is needed; ST25R3915 is optimized for fixed-tuned or externally tuned antenna designs with lower BOM cost. |
| NXP PN7462AU | Lacks AEC-Q100 qualification; max RF output ≤500 mW; no dual antenna drivers; supports only ISO 14443A/B and NFCIP-1. | Suitable for non-automotive consumer or industrial NFC readers where Grade 1 reliability and 1 W output are not required. | Choose PN7462AU only for cost-sensitive, non-automotive applications with simpler protocol needs and lower RF power demands. |
Compared with ST25R3914-AQWT, ST25R3915-AQWT removes AAT to reduce die size and cost while retaining identical automotive qualification and RF performance; versus PN7462AU, it delivers higher output power, dual-antenna capability, broader protocol support, and full AEC-Q100 compliance-making it uniquely suited for safety-critical vehicle access systems.
Availability
ST25R3915-AQWT is available at Aetrix Electronics and suitable for automotive keyless entry, secure vehicle access, and NFC-based digital car key systems requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for ST25R3915-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 connectivity solutions for automotive, industrial, and consumer markets.
The ST25R series targets automotive-grade NFC infrastructure, emphasizing robust RF performance, ultra-low-power wake-up, and seamless integration with secure elements and host MCUs in vehicle access and identity management systems.
FAQ
Is ST25R3915-AQWT pin-compatible with ST25R3914-AQWT?
Yes, ST25R3915-AQWT and ST25R3914-AQWT share identical QFN32 (5 mm × 5 mm) packaging, pin assignment, and electrical interface. The only functional difference is the absence of the automatic antenna tuning (AAT) block in the ST25R3915, making it a drop-in replacement where AAT is not required.
What antenna topologies does ST25R3915-AQWT support?
ST25R3915-AQWT supports differential (balanced) antenna configurations on both ANT1 and ANT2 ports, as well as single-ended operation using either port with appropriate external matching. It does not integrate AAT, so external LC tuning or fixed-matching networks must be used to optimize antenna resonance at 13.56 MHz.
Does ST25R3915-AQWT support MIFARE Classic encryption?
No, ST25R3915-AQWT provides the analog front end and framing engine but does not implement MIFARE Classic crypto algorithms internally. It supports Transparent and Stream modes, allowing an external MCU to handle cryptographic operations while the ST25R3915 manages precise RF timing, modulation, and demodulation.
Can ST25R3915-AQWT operate from a 3.3 V supply only?
Yes, ST25R3915-AQWT operates across 2.4 V to 5.5 V, so 3.3 V is fully supported for VDD and VDDIO. At 3.3 V, maximum RF output is ~750 mW (differential), and all digital interfaces-including 6 Mbit/s SPI-remain fully functional with proper decoupling and layout.
ST25R3915-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)
ST25R3915-AQWT FAQ
1.How can I place an order for ST25R3915-AQWT through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25R3915-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 ST25R3915-AQWT reliable?
The price and inventory of ST25R3915-AQWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25R3915-AQWT is usually 5 days.
3.What payment methods are accepted for ST25R3915-AQWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25R3915-AQWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25R3915-AQWT?
ST25R3915-AQWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25R3915-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 ST25R3915-AQWT?
For technical support, including ST25R3915-AQWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25R3915-AQWT requirements.
6.How does Aetrix verify that ST25R3915-AQWT is sourced from the original manufacturer or authorized distributors?
All ST25R3915-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 ST25R3915-AQWT meets industry standards.
7.What is the process for return or replacement of ST25R3915-AQWT?
All ST25R3915-AQWT units undergo pre-shipment inspection (PSI). If there is an issue with ST25R3915-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 ST25R3915-AQWT part is unused and in its original packaging.
Return procedure for ST25R3915-AQWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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