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STMicroelectronics ST25R3920-AQWT
- Part No.:
- ST25R3920-AQWT
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ST25R3920-AQWT.pdf
- Description:
- NFC / HF RFID READER IC
- Quantity:
- Payment:
- Shipping:
Inventory:14,728
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Product details
Overview
ST25R3920-AQWT from STMicroelectronics is an AEC-Q100 qualified automotive NFC reader IC supporting EMVCo 3.0 analog/digital compliance, ISO14443A/B up to 848 kbit/s, NFC-F/FeliCa™ up to 424 kbit/s, and NFC-V/ISO15693 up to 53 kb/s. It operates in reader/writer, card emulation, and active/passive peer-to-peer modes, with integrated antenna tuning and noise suppression for digital key and center console applications.
For engineers reviewing the ST25R3920-AQWT datasheet, ST25R3920-AQWT pinout, ST25R3920-AQWT application, or ST25R3920-AQWT equivalent, this device delivers automotive-grade NFC performance with dynamic power output, automatic antenna tuning, and dual-antenna support - critical for CCC-compliant digital key systems and infotainment interface design.
Technical Context
The ST25R3920 integrates a fully programmable RF front-end with AM/PM and I/Q demodulation, baseband channel summation or automatic selection, and on-chip phase/amplitude detection. Its transmitter supports adjustable ASK modulation depth (5–40%) and dynamic power output (DPO) to maintain field strength within regulatory limits.
The receiver features noise suppression (NSR), automatic gain control, squelch, and low-power capacitive/inductive card detection. It includes dedicated hardware for EMVCo 3.0 EMD handling, passive target memory (P2RAM), and real-time antenna voltage/phase/RSSI measurement - enabling robust operation in electrically noisy automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Protocols | EMVCo 3.0 analog/digital compliant; NFC-A/B/F/V, ISO14443A/B, FeliCa™, ISO15693 |
| Data Rates | Up to 848 kbit/s (NFC-A/B), 424 kbit/s (NFC-F/P2P), 53 kb/s (NFC-V) |
| Operating Temp | -40 °C to +105 °C (2.6–5.5 V supply); -20 °C to +105 °C (2.4–5.5 V) |
| Supply Voltage | 2.4–5.5 V main supply; 1.65–5.5 V peripheral interface supply |
| Communication | SPI up to 5 Mbit/s; I²C Fast-mode Plus (1 Mbit/s) and High-speed mode (3.4 Mbit/s) |
| FIFO Size | 512-byte hardware FIFO for burst data transfer and latency reduction |
| Antenna Support | Two independent single-ended antennas with automatic tuning via variable capacitor |
Pinout & Package
VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with wettable flank leads for automotive optical inspection. Exposed thermal pad enhances thermal dissipation in high-duty-cycle NFC reader operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Main power supply input | 2.4–5.5 V supply for core, RF, and regulators; decoupling required per datasheet layout guidelines |
| VDDIO | I/O power supply | 1.65–5.5 V supply for SPI/I²C pins; enables level-shifting with host MCU |
| CLK | Crystal oscillator input | Accepts 27.12 MHz fundamental-mode crystal; fast start-up timing critical for wake-on-field |
| ANT1 / ANT2 | RF antenna outputs | Differential-capable single-ended outputs; support independent tuning for dual-antenna configurations |
| IRQ | Interrupt request output | Open-drain signal indicating RX FIFO full, collision, field detection, or timer expiry |
| MOSI / MISO / SCK / NSS | SPI interface signals | Full-duplex 4-wire SPI up to 5 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) for flexible host integration |
| CSO / CSI | Test/debug observation pins | Configurable as analog test outputs (e.g., RSSI, phase, amplitude) for production calibration |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Power Output (DPO) | Real-time field strength regulation to meet EMVCo/NFC forum limits without external feedback loop |
| Active Wave Shaping (AWS) | Hardware-based overshoot/undershoot compensation reducing EMI and improving waveform fidelity |
| Noise Suppression Receiver (NSR) | Enhanced SNR in >100 mVpp conducted noise environments typical of automotive power domains |
| Automatic Antenna Tuning (AAT) | On-chip variable capacitor control enabling <50 ms retuning after temperature or mechanical drift |
| Integrated EMVCo 3.0 EMD Handling | Dedicated hardware block for electromagnetic disturbance detection and mitigation during secure transactions |
| Capacitive & Inductive Card Detection | Ultra-low-power (<15 µA) wake-up sensing enabling always-on digital key readiness |
Applications
| Automotive Digital Key | Center Console NFC Interface |
|---|---|
|
Use Scenario: Passive entry/ignition system where smartphone or fob communicates with vehicle via NFC when near door handle or start button. IC Role / Device Role / Timing Role: Reader/writer initiator performing secure polling, authentication handshake, and encrypted command exchange at 106–424 kbit/s. Use Value: AEC-Q100 qualification and DPO/AWS ensure reliable field generation and interference immunity in high-noise 12 V battery environments. |
Use Scenario: Infotainment center enabling tap-to-pair, wallet provisioning, or service activation via NFC tag or phone. IC Role / Device Role / Timing Role: Dual-mode initiator/target supporting both reader and card emulation for seamless user interaction. Use Value: Integrated P2RAM and passive target memory enable low-latency emulation without host MCU intervention. |
| Secure Access Control Terminal | Automotive Service Diagnostic Tool |
|
Use Scenario: Aftermarket access module for fleet management or valet mode activation using NFC credentials. IC Role / Device Role / Timing Role: EMVCo 3.0-compliant reader verifying payment-grade credentials during physical access handoff. Use Value: On-chip EMD handling and NSR ensure transaction integrity despite proximity to ignition coils or DC-DC converters. |
Use Scenario: Technician tool reading vehicle-specific NFC tags embedded in ECUs or service panels for configuration or diagnostics. IC Role / Device Role / Timing Role: High-sensitivity listen-mode receiver detecting weak fields from passive tags in shielded compartments. Use Value: Adjustable ASK depth (5–40%) and automatic gain control optimize detection across varied tag orientations and metal enclosures. |
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 AEC-Q100 qualification; no integrated EMD handling or NSR; lower max data rate (424 kbit/s only for NFC-A/F) | Targeted at consumer electronics; not validated for automotive ambient temperature or EMC stress profiles | Select when cost-sensitive non-automotive designs require basic NFC-A/F support without EMVCo 3.0 compliance |
| TRF7970A | Discontinued by TI; no AAT or DPO; requires external LNA and matching network; supports ISO15693 only up to 26.48 kb/s | Legacy industrial readers; lacks automotive qualification and modern protocol stack (e.g., NFC-V 53 kb/s) | Only for legacy replacement with existing PCB layout; no long-term supply assurance or automotive support |
Compared with PN5180A and TRF7970A, the ST25R3920-AQWT uniquely combines AEC-Q100 qualification, EMVCo 3.0 compliance, dual-antenna support, and hardware-accelerated EMD/NSR - making it the sole choice for new automotive digital key designs requiring functional safety and regulatory conformance.
Availability
ST25R3920-AQWT is available at Aetrix Electronics and suitable for automotive digital key systems, center console interfaces, secure access terminals, and diagnostic tools requiring stable component supply across extended temperature ranges and rigorous EMC environments.
Supply support for ST25R3920-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, analog ICs, and automotive-grade solutions used in over 200 billion devices annually.
The ST25R series targets automotive and industrial NFC applications demanding high reliability, EMVCo compliance, and integrated RF front-end intelligence - specifically engineered for digital key, secure access, and infotainment interface systems.
FAQ
Is ST25R3920-AQWT qualified for automotive use?
Yes. The ST25R3920-AQWT is AEC-Q100 Grade 2 qualified (-40 °C to +105 °C), with built-in EMD handling, noise suppression, and dynamic power control specifically validated for automotive digital key and center console applications per ISO 11452 and CISPR 25 requirements.
What antenna topologies does ST25R3920-AQWT support?
It supports two independent single-ended antennas via ANT1 and ANT2 outputs, each configurable with on-chip automatic antenna tuning (AAT) using an external variable capacitor. Differential antenna operation is not supported; layout must follow ST's reference design for 27.12 MHz matching networks.
Does ST25R3920-AQWT support EMVCo 3.0 certification out of the box?
Yes. It includes integrated EMVCo 3.0-compliant analog and digital circuitry - including EMD detection/mitigation, precise field strength control (DPO), and waveform shaping (AWS) - enabling full certification when paired with ST's certified firmware stack and reference antenna layout.
Can ST25R3920-AQWT operate in low-power listen mode?
Yes. It features ultra-low-power capacitive and inductive card detection consuming <15 µA, plus dedicated listen-mode hardware that maintains field sensitivity while minimizing current draw - enabling always-on readiness for digital key wake-up without compromising battery life.
ST25R3920-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:
- I2C, SPI
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-VFQFPN (5x5)
ST25R3920-AQWT FAQ
1.How can I place an order for ST25R3920-AQWT through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25R3920-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 ST25R3920-AQWT reliable?
The price and inventory of ST25R3920-AQWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25R3920-AQWT is usually 5 days.
3.What payment methods are accepted for ST25R3920-AQWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25R3920-AQWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25R3920-AQWT?
ST25R3920-AQWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25R3920-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 ST25R3920-AQWT?
For technical support, including ST25R3920-AQWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25R3920-AQWT requirements.
6.How does Aetrix verify that ST25R3920-AQWT is sourced from the original manufacturer or authorized distributors?
All ST25R3920-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 ST25R3920-AQWT meets industry standards.
7.What is the process for return or replacement of ST25R3920-AQWT?
All ST25R3920-AQWT units undergo pre-shipment inspection (PSI). If there is an issue with ST25R3920-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 ST25R3920-AQWT part is unused and in its original packaging.
Return procedure for ST25R3920-AQWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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