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STMicroelectronics ST25R3917B-AQET
- Part No.:
- ST25R3917B-AQET
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
ST25R3917B-AQET.pdf
- Description:
- IC RFID READER 13.56MHZ 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
ST25R3917B-AQET from STMicroelectronics is a high-performance NFC universal reader IC supporting EMVCo 3.0-compliant contactless payment, ISO14443A/B/F/V protocols up to 848 kbit/s, card emulation, and active/passive peer-to-peer modes. It integrates dynamic power output (DPO), active wave shaping (AWS), noise suppression receiver (NSR), automatic antenna tuning (AAT), and dual-antenna drive capability for robust field control in noisy industrial and point-of-sale environments.
For engineers reviewing the ST25R3917B-AQET datasheet, ST25R3917B-AQET pinout, ST25R3917B-AQET application, or ST25R3917B-AQET equivalent, this device serves as a full-featured NFC front-end for secure transaction terminals, access control readers, and multi-protocol smart card interfaces requiring EMVCo certification, low-power target detection, and adaptive RF field management.
Technical Context
The ST25R3917B-AQET implements a dual-channel I/Q demodulator with baseband summation or automatic channel selection, enabling reliable signal recovery across NFC-A, -B, -F, and -V standards. Its transmitter supports adjustable ASK modulation depth (5–40%) and dynamic field strength control via DPO and AAT, while the receiver features automatic gain control, squelch, and NSR to maintain SNR in electrically noisy settings.
It embeds an integrated EMVCo 3.0-compliant EMD handling block, capacitive and inductive card detection circuitry, and a 27.12 MHz quartz oscillator with fast start-up. The device supports both SPI (up to 10 Mbit/s) and I²C (up to 3.4 Mbit/s) host interfaces, with a 512-byte FIFO and direct command set for low-latency field control and real-time amplitude/phase/RSSI measurement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| NFC Protocols | ISO14443A/B up to 848 kbit/s, FeliCa™/NFC-F up to 424 kbit/s, ISO15693/NFC-V up to 53 kbit/s - enables interoperability with global contactless cards and tags. |
| EMVCo Compliance | EMVCo 3.0 analog and digital compliant - certified for secure payment terminal deployment without external analog front-end validation. |
| Modulation Depth | Adjustable ASK modulation depth from 5% to 40% - allows fine-tuning of field coupling efficiency and EMI margin per regional regulatory requirements. |
| Supply Voltage Range | 2.6–5.5 V at –40 °C to +105 °C - supports wide-input industrial and automotive-grade power rails without external LDOs. |
| Host Interface Speed | SPI up to 10 Mbit/s, I²C up to 3.4 Mbit/s (High-speed mode) - ensures minimal latency for real-time field control and interrupt-driven card presence detection. |
| Antenna Support | Drives two independent single-ended antennas - enables dual-interface readers (e.g., front/back panel or near/far field) without external RF switches. |
| Integrated Tuning | Automatic antenna tuning (AAT) via variable capacitor - maintains optimal impedance match during temperature drift or mechanical stress on PCB-mounted antennas. |
Pinout & Package
VFQFPN32 package (5 × 5 mm, 0.5 mm pitch) with wettable flanks; thermally enhanced for continuous RF operation in compact POS and kiosk enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main supply input | Accepts 2.6–5.5 V; powers internal regulators and RF stages - decoupling required per layout guidelines to suppress switching noise. |
| VDDIO | I/O supply input | Independent 1.65–5.5 V rail for SPI/I²C logic - enables level-shifting with 1.8 V or 3.3 V microcontrollers without external translators. |
| RFOUT_A / RFOUT_B | Dual antenna driver outputs | Single-ended RF outputs for independent antenna connections - supports simultaneous listen-mode on one antenna while transmitting on another. |
| IRQ | Interrupt request output | Open-drain active-low signal indicating card detection, FIFO status, or protocol event - reduces polling overhead in low-power embedded hosts. |
| SCLK / SDA / SCL / CS | Host interface signals | Configurable for SPI (4-wire) or I²C (2-wire + IRQ) - pin-strapping and register settings determine interface mode at power-on reset. |
| ANT1 / ANT2 | Antenna connection points | Direct RF output nodes; require external matching network and ESD protection - layout critical for EMVCo radiated emission compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Power Output (DPO) | Real-time field strength regulation within ±5% tolerance - eliminates need for external field monitoring circuits in EMVCo-certified designs. |
| Noise Suppression Receiver (NSR) | Enables reliable reception under >20 dBm conducted noise - validated per EN 55032 Class B for industrial reader deployments. |
| Active Wave Shaping (AWS) | Reduces RF waveform overshoot/undershoot by >60% vs. conventional drivers - improves signal integrity and reduces harmonic emissions. |
| Capacitive Card Detection | Low-power (<10 µA) wake-up sensing - detects card approach without RF field activation, extending battery life in portable readers. |
| On-chip Phase/Amplitude Measurement | Direct readout of antenna voltage phase and amplitude with 0.1°/1 mV resolution - enables closed-loop antenna tuning and field uniformity mapping. |
Applications
| EMVCo Payment Terminal | Secure Access Control Reader |
|---|---|
Use Scenario: Contactless credit/debit card transactions in unattended kiosks and ATMs. IC Role / Device Role / Timing Role: Full EMVCo 3.0 analog/digital front-end managing field generation, modulation, demodulation, and EMD handling per specification. Use Value: Eliminates external analog validation components and reduces time-to-certification by integrating all EMVCo-required RF functions. |
Use Scenario: Multi-technology credential reading (MIFARE DESFire, NTAG, ISO15693) in enterprise door controllers. IC Role / Device Role / Timing Role: Universal protocol initiator supporting legacy and modern tag types with automatic bit-rate detection and collision resolution. Use Value: Single-chip support for 4+ NFC standards avoids firmware forks and hardware variants across product SKUs. |
| Industrial Asset Tagging System | Portable NFC Diagnostic Tool |
Use Scenario: Ruggedized handheld scanner identifying metal-mounted UHF/NFC hybrid tags in factory maintenance workflows. IC Role / Device Role / Timing Role: High-sensitivity passive target listener with capacitive wake-up and low-power listen mode (25 µA typical). Use Value: Extends battery life beyond 12 months on coin cell while maintaining sub-100 ms card detection latency. |
Use Scenario: Field-service tool validating NFC antenna performance and field homogeneity on deployed equipment. IC Role / Device Role / Timing Role: Real-time RF diagnostic engine measuring antenna voltage amplitude/phase, RSSI, and regulator outputs via SPI. Use Value: Replaces benchtop VNAs for on-site antenna tuning - reduces calibration time from hours to seconds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NFC reader applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PN5180A | Lacks EMVCo 3.0 analog compliance; no integrated EMD handling or NSR - requires external analog validation for payment use. | Targeted at non-EMV consumer IoT readers; not qualified for PCI PTS v6.0 or EMVCo Level 1. | Select when cost sensitivity outweighs certification requirements and field robustness is secondary. |
| TRF7970A | Supports ISO14443A/B/F but not NFC-V or EMVCo 3.0; no AAT or DPO - relies on external tuning and field control. | Legacy industrial RFID reader design; limited to basic proximity card reading without secure transaction features. | Choose only for brownfield upgrades where existing TRF7970A firmware and antenna layout must be reused. |
Compared with PN5180A and TRF7970A, the ST25R3917B-AQET delivers certified EMVCo 3.0 readiness, autonomous antenna tuning, and noise-immune reception - reducing system BOM count by 3–5 components and accelerating time-to-market for payment-grade devices.
Availability
ST25R3917B-AQET is available at Aetrix Electronics and suitable for EMVCo-certified payment terminals, secure physical access systems, and industrial asset tracking solutions requiring stable component supply, long-term lifecycle assurance, and full production traceability.
Supply support for ST25R3917B-AQET 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, specializing in microcontrollers, analog ICs, and smart power solutions for industrial, automotive, and consumer markets.
The ST25R series is designed specifically for high-reliability NFC reader applications demanding EMVCo certification, multi-standard interoperability, and adaptive RF field control - targeting secure transaction infrastructure and mission-critical identification systems.
FAQ
What is the maximum data rate supported by ST25R3917B-AQET for ISO14443A communication?
The ST25R3917B-AQET supports ISO14443A communication at up to 848 kbit/s, matching the highest speed defined in the standard for Type A cards. This rate is achieved using its dual-channel I/Q demodulator with automatic channel selection and optimized baseband filtering, enabling fast transaction throughput in payment terminals and high-throughput access systems.
Does ST25R3917B-AQET include built-in EMVCo 3.0 EMD handling?
Yes, the ST25R3917B-AQET integrates full EMVCo 3.0-compliant EMD (Electromagnetic Disturbance) handling, including analog-level pulse detection, timing validation, and digital response generation. This eliminates the need for external analog comparators or custom firmware logic to meet EMVCo Level 1 certification requirements.
Can ST25R3917B-AQET drive two antennas simultaneously in different modes?
Yes - the device supports independent operation of RFOUT_A and RFOUT_B, allowing one antenna to operate in listen mode while the other transmits, or enabling dual-field configurations (e.g., near-field + far-field). This is controlled via dedicated registers and does not require external RF switches or multiplexers.
What is the operating temperature range for ST25R3917B-AQET in full specification?
The ST25R3917B-AQET operates over –40 °C to +105 °C at supply voltages from 2.6 V to 5.5 V, meeting extended industrial temperature requirements. This range is validated across all RF performance parameters, including field strength stability, modulation accuracy, and receiver sensitivity, per DS12484 Rev 8 specifications.
ST25R3917B-AQET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ST25R
- Package/Case:
- 32-UFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- RFID Reader/Transponder
- Frequency:
- 13.56MHz
- Standards:
- FeliCa, ISO 14443, ISO 15693, MIFARE, NFC
- Interface:
- I2C, SPI
- Voltage - Supply:
- 2.4V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-UFQFPN (5x5)
ST25R3917B-AQET FAQ
1.How can I place an order for ST25R3917B-AQET through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25R3917B-AQET 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 ST25R3917B-AQET reliable?
The price and inventory of ST25R3917B-AQET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25R3917B-AQET is usually 5 days.
3.What payment methods are accepted for ST25R3917B-AQET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25R3917B-AQET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25R3917B-AQET?
ST25R3917B-AQET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25R3917B-AQET 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 ST25R3917B-AQET?
For technical support, including ST25R3917B-AQET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25R3917B-AQET requirements.
6.How does Aetrix verify that ST25R3917B-AQET is sourced from the original manufacturer or authorized distributors?
All ST25R3917B-AQET 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 ST25R3917B-AQET meets industry standards.
7.What is the process for return or replacement of ST25R3917B-AQET?
All ST25R3917B-AQET units undergo pre-shipment inspection (PSI). If there is an issue with ST25R3917B-AQET, 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 ST25R3917B-AQET part is unused and in its original packaging.
Return procedure for ST25R3917B-AQET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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