STMicroelectronics S2-LPCBQTR

Overview

S2-LPCBQTR from STMicroelectronics is an ultra-low power, high-performance sub-1 GHz RF transceiver supporting 452–527 MHz and 904–1055 MHz ISM/SRD bands. It implements 2(G)FSK/4(G)FSK/OOK/ASK modulation, delivers −130 dBm receiver sensitivity, 145 dB RF link budget, and programmable +16 dBm output power. It enables long-range, battery-operated wireless sensor networks compliant with ETSI EN 300 220, FCC Part 15, ARIB STD-T67, and SRRC.

For engineers reviewing the S2-LPCBQTR datasheet, S2-LPCBQTR pinout, S2-LPCBQTR application, or S2-LPCBQTR equivalent, this page provides verified technical context on its low-IF RX architecture, embedded CSMA/CA engine, IEEE 802.15.4g hardware packet support, antenna diversity control, and SPI-configurable 128-byte TX/RX FIFOs - all critical for smart metering and SIGFOX™-compatible system design.

Technical Context

The S2-LPCBQTR employs a low-IF receiver architecture with dual-stage LNA, quadrature I/Q downconversion, and programmable digital channel filtering. Its transmitter uses direct RF synthesis with integrated VCO and PA capable of +16 dBm output in boost mode (SMPS at 1.8 V), supporting narrow-channel spacing down to 1 kHz.

It integrates a configurable baseband modem with hardware-accelerated IEEE 802.15.4g features (whitening, FEC, CRC, dual SYNC word detection), Wireless M-Bus, KNX-RF, and SIGFOX™/MONARCH protocol readiness. Power management includes SMPS (90% efficiency), programmable LDC/sniff modes, and a calibrated 34.7 kHz RC oscillator for ultra-low-power wake-up timing.

Key Specifications

Pinout & Package

Package: QFN24 (4 × 4 mm, 0.5 mm pitch), exposed thermal pad (GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sub-1 GHz transceiver applications.

Compared with SX1262IMLTRT and CC1312R1F3RGZR, the S2-LPCBQTR uniquely combines −130 dBm sensitivity, hardware IEEE 802.15.4g, Wireless M-Bus, and 7 mA RX current - making it the only option qualified for ETSI EN 303 131-compliant smart gas meters with 15-year battery life.

Availability

S2-LPCBQTR is available at Aetrix Electronics and suitable for smart metering, industrial monitoring, home energy management, and wireless alarm systems requiring stable component supply across global regulatory domains including FCC, ETSI, ARIB, and SRRC.

Supply support for S2-LPCBQTR 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 microcontrollers, analog ICs, MEMS, and power solutions to industrial, automotive, and consumer markets.

The S2-LP product line targets ultra-low-power, regulatory-compliant sub-GHz wireless systems - specifically engineered for battery-operated utility meters, building automation, and LPWAN infrastructure where RF performance, protocol offload, and 10+ year operational life are mandatory.

FAQ

What crystal frequency options does the S2-LPCBQTR support?

The S2-LPCBQTR supports 24–26 MHz or 48–52 MHz crystals. With a 24–26 MHz crystal, both analog and digital domains run at the same frequency; with 48–52 MHz, the digital clock is automatically divided by two. Crystal tolerance must be ≤±40 ppm to maintain frequency accuracy across temperature and aging.

Does the S2-LPCBQTR require external balun components?

No - the S2-LPCBQTR is compatible with ST's companion integrated balun/filter chips (e.g., BALF-SPI2-01D3), enabling single-chip RF front-end implementation. Discrete matching networks are optional for custom impedance tuning or cost-sensitive designs without balun integration.

How does the embedded CSMA/CA engine operate without host intervention?

The CSMA/CA engine executes listen-before-talk autonomously: it measures channel energy during configurable idle periods, defers transmission if activity exceeds threshold, and retries with exponential backoff - all handled in hardware without CPU involvement or firmware polling loops.

Can the S2-LPCBQTR achieve +16 dBm output in both 452–527 MHz and 904–1055 MHz bands?

Yes - +16 dBm is achievable in both bands using boost mode (SMPS output at 1.8 V). At 452–527 MHz, typical TX current is 32 mA; at 904–1055 MHz, it is 29 mA. Output power is digitally programmable in 0.5 dB steps across the full −30 to +16 dBm range.