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STMicroelectronics S2-LPQTR
- Part No.:
- S2-LPQTR
- Manufacturer:
- STMicroelectronics
- Category:
- RF Transceiver ICs
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
S2-LPQTR.pdf
- Description:
- IC RF TXRX ISM<1GHZ 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:132,464
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Product details
Overview
S2-LPQTR from STMicroelectronics is an ultra-low power, high-performance sub-1 GHz RF transceiver supporting 413–479 MHz and 826–958 MHz ISM/SRD bands. It implements 2(G)/4(G)FSK, OOK/ASK modulation with air data rates from 0.1 to 500 kbps, achieves −130 dBm receiver sensitivity, and delivers >145 dB RF link budget-enabling long-range wireless sensor networks in smart metering and industrial monitoring.
For engineers reviewing the S2-LPQTR datasheet, S2-LPQTR pinout, S2-LPQTR application, or S2-LPQTR equivalent, key selection criteria include programmable channel spacing down to 1 kHz, embedded CSMA/CA and IEEE 802.15.4g hardware packet support (whitening, FEC, dual SYNC), antenna diversity control, and SMPS-based power management enabling 7 mA RX / 10 mA TX @ +10 dBm operation from 1.8–3.6 V.
Technical Context
The S2-LPQTR employs a low-IF receiver architecture with two-stage LNA and quadrature I/Q downconversion, paired with fully programmable digital baseband processing. Its RF synthesizer supports frequency hopping and offers <24 Hz frequency step size with phase noise as low as −124 dBc/Hz @ 1 MHz offset at 868 MHz.
Transmit path uses direct RF synthesis with integrated PA configurable from −30 to +16 dBm (boost mode), while embedded protocol engines handle automatic ACK/retransmission, timeout management, and LDC/sniff-mode low-duty-cycle operation-enabling battery life up to 10+ years in metering applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Bands | 413–479 MHz and 826–958 MHz; supports ETSI EN 300 220, FCC Part 15/90, ARIB STD-T67/T108, SRRC compliance |
| Modulation Schemes | 2(G)FSK, 4(G)FSK, OOK, ASK; enables interoperability with Wireless M-Bus, KNX-RF, SIGFOX™, and MONARCH protocols |
| Air Data Rate | 0.1–500 kbps; supports narrowband (1 kHz channel spacing) and wideband (780 kHz filter) operation for flexible spectrum use |
| Receiver Sensitivity | −130 dBm @ 0.3 kbps (2-GFSK); enables >10 km range in rural LPWAN deployments with 50 Ω reference antenna |
| RF Link Budget | >145 dB; derived from −130 dBm sensitivity and +16 dBm max output, enabling robust link margin in noisy industrial environments |
| Power Consumption | 7 mA RX (HPM), 10 mA TX @ +10 dBm; SMPS efficiency >90% extends coin-cell lifetime beyond 5 years in periodic wake-up sensor nodes |
| Integrated Features | 128-byte RX/TX FIFOs, 4-wire SPI interface, GPIO0–GPIO3, embedded CSMA/CA, IEEE 802.15.4g packet engine, antenna diversity control |
Pinout & Package
Package: QFN24 (4 × 4 mm, 0.5 mm pitch), thermally enhanced with exposed GND pad (Pin 25).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD SMPS | Analog power supply input | Dedicated 1.8–3.6 V rail for internal switched-mode power supply only; requires external LC filtering on SMPS1/SMPS2 |
| 4 XOUT / 5 XIN | Crytal oscillator interface | Supports 24–26 MHz or 48–52 MHz crystals; XIN accepts external clock (≥400 mVpp, 0–1.4 V DC level) |
| 11 TX / 13–14 RXN/RXP | RF signal terminals | Differential RX inputs (50 Ω matched), single-ended TX output; requires discrete or balun-based matching network |
| 16–19 SDO/SDI/SCLK/CSn | Digital interface | Standard 4-wire SPI bus; supports daisy-chaining and fast register access (<1 µs per byte) |
| 20–23 GPIO0–GPIO3 | Configurable I/O | Programmable via SPI registers for IRQ, packet-ready, sync pulse, or custom timing signals |
Key Features
| Feature | Design Value |
|---|---|
| Embedded CSMA/CA Engine | Hardware-accelerated listen-before-talk logic reduces channel collision in dense mesh networks without MCU intervention |
| IEEE 802.15.4g Hardware Support | On-the-fly whitening, FEC encoding/decoding, CRC-16, and dual SYNC word detection offload 30% of MCU packet processing |
| Antenna Diversity Algorithm | Automatic RX/TX antenna switching based on real-time RSSI and packet error rate improves link reliability by >8 dB in multipath environments |
| Ultra-Low Power RC Oscillator | 33.3 kHz calibrated clock (±1%) enables precise 1-second LDC wake-up intervals with <3 µA sleep current |
| Programmable RX Digital Filter | Channel bandwidth adjustable from 1–800 kHz; allows optimal SNR trade-off for narrowband metering (4 kHz) or broadband telemetry (100 kHz) |
Applications
| Smart Metering | Wireless Alarm Systems |
|---|---|
|
Use Scenario: Battery-powered gas/water/electricity meters transmitting hourly consumption data over 1–5 km in urban/suburban areas. IC Role / Device Role / Timing Role: Sub-GHz transceiver handling physical layer framing, FEC, and automatic retransmission under ETSI EN 300 220 Category 1.5. Use Value: −130 dBm sensitivity and +16 dBm boost-mode output enable reliable reception despite building penetration loss and co-channel interference. |
Use Scenario: Wireless door/window sensors and motion detectors reporting intrusion events to central panel with <5 s latency and >5-year battery life. IC Role / Device Role / Timing Role: Low-power RF transceiver executing LDC mode with 1 s sniff interval, CSMA/CA channel access, and embedded timeout protocol. Use Value: 7 mA RX current and hardware packet acknowledgment reduce average system current to <1 µA, extending CR2032 lifetime beyond 7 years. |
| Industrial Monitoring | Building Automation |
|
Use Scenario: Temperature, pressure, and vibration sensors deployed on rotating machinery in factories, transmitting condition data every 10 seconds. IC Role / Device Role / Timing Role: Robust sub-GHz transceiver with antenna diversity and >80 dB blocking selectivity operating in electrically noisy factory environments. Use Value: 82 dB image rejection at ±10 MHz and −25 dBm IIP3 allow clean reception amid VFD harmonics and motor drive emissions. |
Use Scenario: HVAC controllers, lighting nodes, and occupancy sensors forming self-healing mesh networks across multi-floor commercial buildings. IC Role / Device Role / Timing Role: IEEE 802.15.4g-compliant transceiver providing hardware whitening, dual SYNC detection, and dynamic payload length for adaptive routing. Use Value: Programmable preamble/SYNC filtering and embedded packet engine reduce MAC-layer overhead, increasing effective throughput by 22% vs. software-only stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sub-GHz transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SX1262IMLTRT | Higher max output (+22 dBm), LoRa modulation native, no embedded CSMA/CA or IEEE 802.15.4g engine | Better for long-range point-to-multipoint LoRaWAN gateways; lacks hardware support for Wireless M-Bus or KNX-RF | Select when range >15 km is required and protocol stack runs entirely on host MCU |
| CC1312R1F3RGZT | ARM Cortex-M4F MCU + RF core, integrated BLE 5.0 stack, lower RX sensitivity (−124 dBm), 433/868/915 MHz bands | Preferred for dual-mode (BLE + Sub-GHz) edge nodes where MCU resources and OTA updates are critical | Choose when firmware flexibility, secure boot, and concurrent protocol support outweigh pure RF performance needs |
Compared with SX1262IMLTRT and CC1312R1F3RGZT, the S2-LPQTR uniquely combines regulatory-certified narrowband operation, hardware-accelerated protocol engines for legacy utility standards, and ultra-low RX current-making it optimal for cost-sensitive, high-volume, battery-powered metering and alarm systems requiring minimal host processing.
Availability
S2-LPQTR is available at Aetrix Electronics and suitable for smart metering, industrial monitoring, and wireless alarm systems requiring stable component supply, full traceability, and long-term lifecycle assurance.
Supply support for S2-LPQTR 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, delivering microcontrollers, analog ICs, MEMS, and power solutions for industrial, automotive, and IoT markets.
The S2-LP product line targets ultra-low power, regulatory-compliant sub-GHz wireless connectivity for utility infrastructure, building automation, and industrial sensing-emphasizing hardware protocol acceleration and battery longevity over raw processing capability.
FAQ
What is the maximum RF output power of the S2-LPQTR, and under what conditions is +16 dBm achievable?
The S2-LPQTR delivers up to +16 dBm output power in boost mode, requiring SMPS output voltage set to 1.8 V (via SMPS2 pin) and proper external matching network tuning. This mode increases TX current to 32 mA at 915 MHz and is validated for operation within ETSI EN 300 220 and FCC Part 15 limits when used with certified antennas and filters.
Does the S2-LPQTR support crystal oscillators outside the 24–26 MHz and 48–52 MHz ranges?
No-the S2-LPQTR's internal XO circuitry is designed exclusively for 24–26 MHz or 48–52 MHz fundamental-mode crystals. Operation outside these ranges risks start-up failure, frequency instability, or degraded phase noise performance. External clock input must meet 400 mVpp amplitude and 0–1.4 V DC level constraints regardless of frequency.
How does the embedded antenna diversity algorithm function without external RF switches?
The S2-LPQTR integrates dedicated GPIO control logic and internal RF path routing to drive external SPDT/SP4T RF switches (e.g., Skyworks SKY13353). It monitors real-time RSSI and packet error rate on both antennas, automatically selecting the optimal path before each RX/TX cycle-reducing manual switch timing design and minimizing insertion loss in compact PCB layouts.
Can the S2-LPQTR operate in FSK modes while maintaining IEEE 802.15.4g compliance?
Yes-the S2-LPQTR supports 2(G)FSK and 4(G)FSK modulation with hardware-accelerated IEEE 802.15.4g features including whitening, CRC-16, FEC, and dual SYNC word detection. When configured per PHY layer parameters in Annex E of IEEE 802.15.4g-2012 (e.g., 50 kHz channel spacing, 2-FSK BT=0.5), it achieves full hardware compliance without host MCU packet manipulation.
S2-LPQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx Only
- RF Family/Standard:
- General ISM < 1GHz
- Protocol:
- SIGFOX™, Wireless M-Bus
- Modulation:
- 2GFSK, 4GFSK, ASK, OOK
- Frequency:
- -
- Data Rate (Max):
- 500kbps
- Power - Output:
- 10dBm
- Sensitivity:
- -130dBm
- Memory Size:
- -
- Serial Interfaces:
- SPI, UART
- GPIO:
- 4
- Voltage - Supply:
- 1.8V ~ 3.6V
- Current - Receiving:
- 8mA
- Current - Transmitting:
- 27mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-QFN (4x4)
S2-LPQTR FAQ
1.How can I place an order for S2-LPQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for S2-LPQTR 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 S2-LPQTR reliable?
The price and inventory of S2-LPQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for S2-LPQTR is usually 5 days.
3.What payment methods are accepted for S2-LPQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for S2-LPQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for S2-LPQTR?
S2-LPQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your S2-LPQTR 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 S2-LPQTR?
For technical support, including S2-LPQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your S2-LPQTR requirements.
6.How does Aetrix verify that S2-LPQTR is sourced from the original manufacturer or authorized distributors?
All S2-LPQTR 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 S2-LPQTR meets industry standards.
7.What is the process for return or replacement of S2-LPQTR?
All S2-LPQTR units undergo pre-shipment inspection (PSI). If there is an issue with S2-LPQTR, 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 S2-LPQTR part is unused and in its original packaging.
Return procedure for S2-LPQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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