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STMicroelectronics ST25RU3992-BQFT
- Part No.:
- ST25RU3992-BQFT
- Manufacturer:
- STMicroelectronics
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
ST25RU3992-BQFT.pdf
- Description:
- IC RFID READER 860-960MHZ 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
ST25RU3992-BQFT from ams AG (formerly austriamicrosystems) is a UHF RFID single-chip reader IC supporting EPC Class 1 Gen2 (ISO 18000-6C) and ISO 18000-6A/B protocols. It integrates analog front-end, protocol engine, on-chip DRM filters, -86 dBm receive sensitivity, 20 dBm RF output, and supports ASK/PR-ASK modulation for handheld and fixed UHF RFID readers.
For engineers reviewing the ST25RU3992-BQFT datasheet, ST25RU3992-BQFT pinout, ST25RU3992-BQFT application, or ST25RU3992-BQFT equivalent, key selection criteria include on-die dense reader mode filtering, programmable RX gain and bandwidth, integrated 24-byte FIFO, dual-interface support (8-bit parallel or 4-pin SPI), and built-in VCO/PLL covering 840–960 MHz.
Technical Context
The ST25RU3992-BQFT implements a fully integrated UHF RFID reader architecture with on-chip VCO and PLL spanning 840–960 MHz, enabling global frequency hopping compliance. Its analog front-end includes dual-path AM/PM demodulation with automatic I/Q selection, eliminating communication blind spots across tag types.
Protocol handling is hardware-accelerated for EPC Gen2, including frame sync, preamble, CRC generation/checking, and framing logic. The device supports both normal mode (with integrated coders/decoders) and direct mode (bypassing digital blocks for MCU real-time analog control), selectable via register configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 840–960 MHz; covers all regional UHF RFID bands with on-chip VCO/PLL and frequency hopping support |
| Receiver Sensitivity | -86 dBm; enables reliable detection of low-power or distant UHF tags in noisy environments |
| Transmit Output Power | 20 dBm into 50 Ω; sufficient for mid-to-long-range reading without external PA in compact designs |
| Modulation Schemes | ASK and PR-ASK; supports legacy and high-data-rate EPC Gen2 tag interrogation |
| Dense Reader Mode Filters | On-chip 250 kHz and 320 kHz DRM filters; eliminates inter-reader interference without external components |
| Host Interface | 8-bit parallel or 4-pin SPI; reduces MCU pin count and simplifies layout versus legacy 16-bit interfaces |
| Supply Voltage Range | 4.1 V to 5.5 V for core operation; IO voltage independently configurable from 1.8 V to 5.5 V for mixed-voltage MCU interfacing |
Pinout & Package
The ST25RU3992-BQFT is housed in a 64-pin QFN package (9 mm × 9 mm, 0.5 mm pitch), optimized for RF performance and thermal dissipation in compact reader modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFOUTP_1 / RFOUTN_1 | Differential RF output | Primary antenna driver pair supporting 20 dBm ASK/PR-ASK transmission with matched impedance |
| MIX_INP / MIX_INN | Differential RX input | Low-noise analog front-end input for AM/PM demodulation with automatic I/Q path selection |
| DAC | Analog output | Drives external power amplifier bias; 1 kΩ output impedance enables direct connection to PA control pins |
| IO0–IO7 | Parallel data bus | 8-bit bidirectional interface for FIFO read/write; supports burst transfers without address strobes |
| CLK / CLSYS | Clock inputs | Accepts 20 MHz crystal reference (OSCI/OSCO) and system clock for timing synchronization |
| VDD_RF / VDD_A / VDD_D | Power domains | Separated supplies isolate RF, analog, and digital sections to minimize noise coupling and ensure stable operation |
Key Features
| Feature | Design Value |
|---|---|
| On-chip DRM filtering | Integrated 250 kHz and 320 kHz filters eliminate need for external SAW filters, reducing BOM and board area |
| Pre-distortion circuitry | Compensates PA nonlinearity in real time, improving spectral mask compliance and external PA efficiency |
| Programmable RX gain & bandwidth | Enables dynamic adaptation to varying tag density, distance, and environmental noise without firmware change |
| 24-byte hardware FIFO | Decouples host MCU timing from RF packet processing, allowing low-overhead interrupt-driven communication |
| Direct mode operation | Bypasses internal coders/decoders to expose raw IQ samples - essential for custom protocol development or advanced signal analysis |
Applications
| Handheld RFID Reader | Fixed-Mount Portal Reader |
|---|---|
Use Scenario: Battery-powered portable scanner used for inventory management in warehouses and retail backrooms. IC Role / Device Role / Timing Role: Primary UHF RFID reader SoC handling full Gen2 protocol stack, RF modulation/demodulation, and host interface. Use Value: Integrated 20 dBm PA and low-voltage operation (4.1 V min) extend battery life while maintaining >3 m read range. | Use Scenario: High-throughput entry/exit portal for logistics tracking in distribution centers. IC Role / Device Role / Timing Role: Core analog + digital reader IC managing multi-antenna switching, dense reader coordination, and real-time tag stream processing. Use Value: On-chip DRM filters and frequency hopping support enable simultaneous operation of multiple portals without interference. |
| Industrial Asset Tracking Terminal | Smart Shelf RFID System |
Use Scenario: Ruggedized terminal mounted on forklifts for real-time asset identification in manufacturing plants. IC Role / Device Role / Timing Role: Embedded RFID reader subsystem providing robust tag reads under vibration, temperature variation, and EMI. Use Value: Dual AM/PM demodulation ensures reliable reads across diverse tag orientations and metallic environments. | Use Scenario: Shelf-integrated sensors monitoring stock levels and product movement in pharmacy or high-value retail displays. IC Role / Device Role / Timing Role: Low-power, compact UHF reader enabling periodic tag polling without disrupting shelf aesthetics or cooling. Use Value: Integrated 3.3 V regulator (20 mA) powers microcontroller and sensors, eliminating need for secondary LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar UHF RFID reader applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Impinj Speedway R2000 | Discrete RF transceiver + FPGA-based protocol processor; requires external PA/LNA and clock synthesis | Targeted at enterprise-grade fixed readers with multi-port scalability and cloud integration | Select when needing >4 antenna ports, Ethernet connectivity, or SDK-based custom command extensions |
| NXP MRFC522 | 13.56 MHz HF RFID reader IC; no UHF capability, lower output power (≤15 dBm), limited to ISO14443/15693 | Suitable only for proximity card reading, NFC pairing, or short-range access control | Select only for HF/NFC applications - not a functional substitute for UHF Gen2 reading |
Compared with Impinj R2000 and NXP MRFC522, the ST25RU3992-BQFT delivers single-chip UHF Gen2 functionality with integrated RF, protocol, and power management - ideal for cost-sensitive, space-constrained, or battery-operated reader designs where full enterprise features are unnecessary.
Availability
ST25RU3992-BQFT is available at Aetrix Electronics and suitable for handheld RFID scanners, fixed-mount portal readers, industrial asset terminals, and smart-shelf systems requiring stable component supply and long-term lifecycle support.
Supply support for ST25RU3992-BQFT 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
ams AG (formerly austriamicrosystems) is an Austrian semiconductor company specializing in high-performance analog and sensor solutions, with deep expertise in RF, optical, and power management ICs.
The ST25RU3992-BQFT belongs to ams's UHF RFID reader IC product line, engineered specifically for compact, globally compliant, and power-efficient Gen2 reader implementations - targeting portable, embedded, and industrial edge devices.
FAQ
What is the minimum required crystal frequency for ST25RU3992-BQFT operation?
The ST25RU3992-BQFT requires a 20 MHz fundamental-mode crystal connected to OSCI/OSCO pins. This frequency serves as the reference for the on-chip PLL, which synthesizes the 840–960 MHz UHF band. No external clock source or frequency multiplication is needed.
Does ST25RU3992-BQFT support EPC Gen2v2 (1.2.0) or only Gen2v1.2.0?
The ST25RU3992-BQFT fully supports EPCglobal Class 1 Generation 2 v1.2.0 (ISO 18000-6C), including all mandatory commands (Query, ACK, ReqRN) and optional features like Select and BlockWrite. It does not implement Gen2v2 extensions such as session-based persistence or enhanced security commands.
Can ST25RU3992-BQFT drive a 50 Ω antenna directly without matching network?
No. While the RFOUTP_1/RFOUTN_1 outputs are designed for 50 Ω differential load, a balun and impedance-matching network are required to convert to single-ended 50 Ω antenna feed. The datasheet specifies external matching components (e.g., Murata LQW15AN series inductors) for optimal return loss and harmonic suppression.
Is the DAC output capable of controlling a Class AB power amplifier?
Yes. The DAC pin provides a 0–1.2 V output with 1 kΩ source impedance, calibrated to linearly control the bias current of external Class AB PAs (e.g., Skyworks SKY65111). Its resolution and settling time support closed-loop TX power regulation per EPC Gen2 power ramp requirements.
ST25RU3992-BQFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ST25R
- Package/Case:
- 64-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- RFID Reader
- Frequency:
- 860MHz ~ 960MHz
- Standards:
- EPC, ISO 18000-6
- Interface:
- SPI
- Voltage - Supply:
- 4.1V ~ 5.5V
- Operating Temperature:
- -40°C ~ 110°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-QFN (9x9)
ST25RU3992-BQFT FAQ
1.How can I place an order for ST25RU3992-BQFT through Aetrix?
Please submit a Request for Quotation (RFQ) for ST25RU3992-BQFT 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 ST25RU3992-BQFT reliable?
The price and inventory of ST25RU3992-BQFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST25RU3992-BQFT is usually 5 days.
3.What payment methods are accepted for ST25RU3992-BQFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST25RU3992-BQFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST25RU3992-BQFT?
ST25RU3992-BQFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST25RU3992-BQFT 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 ST25RU3992-BQFT?
For technical support, including ST25RU3992-BQFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST25RU3992-BQFT requirements.
6.How does Aetrix verify that ST25RU3992-BQFT is sourced from the original manufacturer or authorized distributors?
All ST25RU3992-BQFT 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 ST25RU3992-BQFT meets industry standards.
7.What is the process for return or replacement of ST25RU3992-BQFT?
All ST25RU3992-BQFT units undergo pre-shipment inspection (PSI). If there is an issue with ST25RU3992-BQFT, 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 ST25RU3992-BQFT part is unused and in its original packaging.
Return procedure for ST25RU3992-BQFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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