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STMicroelectronics ST25R3917-AQWT
- Part No.:
- ST25R3917-AQWT
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ST25R3917-AQWT.pdf
- Description:
- NFC
- Quantity:
- Payment:
- Shipping:
Inventory:4,277
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Product details
Overview
ST25R3917-AQWT from STMicroelectronics is a high-performance NFC universal reader IC supporting EMVCo 3.0-compliant contactless payment, ISO14443A/B/F/V protocols, and active/passive peer-to-peer communication up to 424 kbit/s. It integrates dynamic power output (DPO), active wave shaping (AWS), noise suppression receiver (NSR), automatic antenna tuning (AAT), and dual-antenna drive capability in a VFQFPN32 package.
For engineers reviewing the ST25R3917-AQWT datasheet, ST25R3917-AQWT pinout, ST25R3917-AQWT application, or ST25R3917-AQWT equivalent, this device serves as a full-featured NFC front-end for secure transaction terminals, industrial access readers, and multi-protocol smart card interfaces requiring field strength control, EMD handling, and low-power target detection.
Technical Context
The ST25R3917-AQWT implements a fully integrated analog front-end with AM/PM and I/Q demodulation, baseband channel summation or automatic selection, and configurable TX encoding/decoding logic for NFC-A/B/F/V and EMVCo 3.0 analog/digital compliance. Its receiver includes squelch, automatic gain control, and RSSI measurement with on-chip phase/amplitude detection.
It supports dual independent single-ended antennas via dedicated TX driver paths, features a 512-byte FIFO, and provides SPI (up to 10 Mbit/s) and I²C (up to 3.4 Mbit/s) host interfaces. The internal quartz oscillator operates at 27.12 MHz with fast start-up, and regulators deliver PSRR enhancement across 2.6–5.5 V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| NFC Protocols | ISO14443A/B (848 kbit/s), NFC-F/FeliCa (424 kbit/s), NFC-V/ISO15693 (53 kbit/s), EMVCo 3.0 analog & digital compliant |
| Operating Modes | Reader/writer, card emulation (NFC-A/F), active/passive P2P initiator/target - enables full NFC ecosystem interoperability |
| RF Field Control | Dynamic Power Output (DPO) and Active Wave Shaping (AWS) ensure precise field strength regulation and waveform fidelity per EMVCo limits |
| Receiver Performance | Noise Suppression Receiver (NSR) + automatic gain control + squelch maximize SNR in electrically noisy environments (e.g., POS terminals) |
| Host Interface | SPI up to 10 Mbit/s and I²C up to 3.4 Mbit/s (High-speed mode) - supports real-time command/response and streaming data transfer |
| Supply Range | 2.6–5.5 V over –40 °C to +105 °C - suitable for industrial-grade embedded readers with wide thermal margins |
| Antenna Support | Two independent single-ended antenna outputs with on-chip voltage/phase/RSSI measurement - enables dual-interface or failover antenna designs |
Pinout & Package
VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with wettable flanks for automated optical inspection. Pin count: 32. Thermal pad exposed on underside for enhanced power dissipation in continuous RF operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main supply input | 2.6–5.5 V analog/digital core supply; decoupling required per datasheet layout guidelines |
| VDDIO | I/O supply input | 1.65–5.5 V programmable interface voltage - enables direct connection to 1.8 V/3.3 V microcontrollers |
| CLK_IN | Crystal oscillator input | Accepts 27.12 MHz fundamental-mode crystal; internal oscillator enables fast wake-up from low-power modes |
| ANT1P / ANT2P | RF antenna outputs | Dual single-ended TX outputs - support independent antenna tuning and redundancy configurations |
| IRQ | Interrupt request output | Open-drain, active-low signal indicating RX FIFO full, collision, field-on/off, or error conditions |
| MOSI / MISO / SCK / NSS | SPI interface signals | Full-duplex 4-wire SPI up to 10 Mbit/s; NSS enables multi-device bus sharing |
| SDA / SCL | I²C interface signals | Supports Fast-mode Plus (1 Mbit/s) and High-speed mode (3.4 Mbit/s); compatible with standard I²C controllers |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Antenna Tuning (AAT) | On-chip variable capacitor control enables real-time resonance compensation without external varactors or manual calibration |
| EMVCo 3.0 EMD Handling | Integrated analog/digital EMD detection and suppression logic meets strict contactless payment interference requirements |
| Capacitive Card Detection | Low-power capacitive sensing detects card presence before RF activation - reduces system wake-up latency and power consumption |
| Adjustable ASK Modulation Depth | 5–40% programmable depth supports legacy MIFARE Classic® and custom protocol implementations |
| Phase & Amplitude Measurement | On-chip measurement of antenna voltage amplitude/phase enables closed-loop tuning and field diagnostics without external test equipment |
Applications
| EMVCo Payment Terminal | Industrial Access Control Reader |
|---|---|
|
Use Scenario: Contactless credit/debit card transactions in point-of-sale (POS) systems certified to EMVCo Level 1 analog and digital requirements. IC Role / Device Role / Timing Role: NFC front-end controller managing field generation, modulation, demodulation, and EMD handling per EMVCo 3.0 specification. Use Value: Integrated DPO and AWS ensure consistent field strength and waveform integrity across varying antenna loads and environmental noise - critical for certification pass rate. |
Use Scenario: Secure door entry systems reading ISO14443A/B cards and NFC smartphones in factory or warehouse environments. IC Role / Device Role / Timing Role: Dual-mode reader supporting both legacy smart cards and modern NFC-enabled devices with automatic protocol detection. Use Value: NSR and low-power passive target detection enable reliable operation near industrial motors and switching power supplies while minimizing standby current. |
| Multi-Protocol Smart Card Kiosk | Medical Device NFC Pairing |
|
Use Scenario: Public self-service kiosks accepting FeliCa, ISO14443A, and ISO15693 cards for transit, ID, and loyalty applications. IC Role / Device Role / Timing Role: Universal NFC transceiver executing protocol-specific initialization, anti-collision, and data exchange sequences autonomously. Use Value: Single-chip support for all major NFC standards eliminates need for multiple discrete readers - reducing BOM cost and PCB footprint. |
Use Scenario: Secure pairing of NFC-enabled medical sensors (e.g., glucose monitors) with handheld diagnostic tablets. IC Role / Device Role / Timing Role: Passive P2P target enabling encrypted handshake and configuration data exchange during proximity-based setup. Use Value: Low-power NFC target mode with capacitive wake-up ensures rapid, energy-efficient pairing without user button press or battery drain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NFC reader applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PN5180A | Single-antenna output, no integrated AAT or capacitive sensor; requires external matching network tuning | Limited to simpler reader designs without field stability or low-power wake-up requirements | Preferred where cost sensitivity outweighs field robustness and multi-protocol flexibility |
| TRF7970A | Legacy TI device supporting ISO14443A/B/F only; no EMVCo 3.0 compliance or NSR; 40-pin QFN package | Not suitable for new EMVCo-certified designs; lacks modern low-noise receiver architecture | Only viable for legacy maintenance or non-certified industrial NFC applications |
Compared with PN5180A and TRF7970A, the ST25R3917-AQWT delivers superior EMVCo 3.0 readiness, dual-antenna support, and integrated diagnostics - making it the optimal choice for next-generation secure contactless terminals requiring field resilience and protocol breadth.
Availability
ST25R3917-AQWT is available at Aetrix Electronics and suitable for EMVCo-certified payment terminals, industrial access readers, and multi-protocol smart card kiosks requiring stable component supply, long-term lifecycle assurance, and full technical documentation support.
Supply support for ST25R3917-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, delivering intelligent power, sensing, and connectivity solutions for automotive, industrial, and consumer markets.
The ST25R series targets high-reliability NFC front-end applications, emphasizing EMVCo compliance, field stability, and integration density for secure transaction infrastructure and industrial identification systems.
FAQ
What is the maximum data rate supported by ST25R3917-AQWT in NFC-A mode?
The ST25R3917-AQWT supports ISO14443A at up to 848 kbit/s in reader mode, matching the highest speed defined in the standard. This enables rapid tag enumeration and large-data transfers such as firmware updates or credential provisioning in under one second.
Does ST25R3917-AQWT require an external crystal oscillator?
Yes - it requires a 27.12 MHz fundamental-mode crystal connected to CLK_IN/CLK_OUT pins. The internal oscillator circuit supports fast start-up (<100 µs), eliminating need for external clock sources while maintaining timing accuracy for EMVCo compliance.
How does Automatic Antenna Tuning (AAT) function without external components?
AAT uses an integrated digitally controlled capacitor bank and on-chip phase/amplitude detector to dynamically adjust antenna resonance. It measures antenna impedance in real time and applies correction via register-controlled capacitance steps - no external varactors or manual tuning needed.
Can ST25R3917-AQWT operate as both reader and card emulator simultaneously?
No - it operates in one mode at a time (reader/writer, card emulation, or P2P). Mode switching is software-controlled via register writes and takes <500 µs. Simultaneous dual-role operation is not supported due to RF path and timing constraints inherent in the architecture.
ST25R3917-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/Transponder
- Frequency:
- 13.56MHz
- Standards:
- FeliCa, ISO 14443, ISO 15693, MIFARE, NFC
- Interface:
- SPI
- Voltage - Supply:
- 2.4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VFQFPN (5x5)
ST25R3917-AQWT FAQ
1.How can I place an order for ST25R3917-AQWT through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25R3917-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 ST25R3917-AQWT reliable?
The price and inventory of ST25R3917-AQWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25R3917-AQWT is usually 5 days.
3.What payment methods are accepted for ST25R3917-AQWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25R3917-AQWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25R3917-AQWT?
ST25R3917-AQWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25R3917-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 ST25R3917-AQWT?
For technical support, including ST25R3917-AQWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25R3917-AQWT requirements.
6.How does Aetrix verify that ST25R3917-AQWT is sourced from the original manufacturer or authorized distributors?
All ST25R3917-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 ST25R3917-AQWT meets industry standards.
7.What is the process for return or replacement of ST25R3917-AQWT?
All ST25R3917-AQWT units undergo pre-shipment inspection (PSI). If there is an issue with ST25R3917-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 ST25R3917-AQWT part is unused and in its original packaging.
Return procedure for ST25R3917-AQWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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