Overview
The SX1231 is a highly integrated RF transceiver capable of operation over a wide frequency range, including the 433, 868 and 915MHz license-free ISM (Industry Scientific and Medical) frequency bands. Its highly integrated architecture allows for a minimum of external components while maintaining maximum design flexibility.
Features
- High Sensitivity: down to -120dBm at 1.2kbps
- High Selectivity: 16-tap FIR Channel Filter
- Bullet-proof front end: IIP3 = -18dBm, IIP2 = +35dBm, 80dB Blocking Immunity, no Image Frequency response
- Low current: Rx = 16mA, 100nA register retention
- Programmable Pout: -18 to +17dBm in 1dB steps
- Constant RF performance over voltage range of chip
- FSK Bit rates up to 300kb/s
- Fully integrated synthesizer with a resolution of 61Hz
- FSK, GFSK, MSK, GMSK and OOK modulations
- Built-in Bit Synchronizer performing Clock Recovery
- Incoming Sync Word Recognition
- 115dB+ Dynamic Range RSSI
- Automatic RF Sense with ultra-fast AFC
- Packet engine with CRC, AES-128 encryption and 66- byte FIFO
- AEC-Q100 Qualified Part
- Built-in temperature sensor and Low Battery indicator
Packaging
- QFN-24
Order Codes
- SX1231IMLTRT: Pb-free, Halogen free, RoHS/WEEE compliant, 3000 pcs, Tape & Reel
- SX1231MESH-868: Mesh Network 868MHz Starter Kit
- SX1231MESH-915: Mesh Network 915MHz Starter Kit
PB Free/ROHS
Learn More →
| Documents | Release Date | Type |  |
|---|---|---|---|
| SX1231 Datasheet | 2018-12-21 | | |
| AN1200.18: Software Implementation of Data Whitening and CRC | 2019-07-12 | | |
| Calculating Radiated Power and Field Strength for Conducted Power Measurements | 2019-04-18 | | |
| FCC Part 15.247 Rules Systems Using Digital Modulation | 2019-04-18 | | |
| Improving the Accuracy of a Crystal Oscillator | 2019-04-18 | | |
| RF Design Guidelines: PCB Layout and Circuit Optimization | 2019-07-03 | | |
| SX1231 Wireless Star Network with FHSS | 2019-07-03 | | |
| XE8000 Driving XE1200 transceivers - Standard API definitions | 2019-07-03 | ZIP | |
| SM1231 Gerber, BOM and Schematics | 2024-02-01 | ZIP | |
| SM1231 RF Module User Guide | 2019-07-03 | | |
| SX1231 RF Module User Guide | 2019-04-16 | | |
| SX1231SKB User Guide | 2019-11-12 | | |
| Documents | Release Date | Type | |
|---|---|---|---|
| Software Releases (Firmware) | 2019-07-03 | ZIP | |
Click diagram to enlarge
Inventory
| Product | Country | Distributor | Qty | Buy |
|---|
Resources
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The Internet of Things (IoT) landscape is witnessing a significant milestone. LoRaWAN®, the low-power wide-area network (LPWAN) standard protocol that has quietly powered smart city initiatives, industrial IoT applications and environmental monitoring projects worldwide, has crossed a threshold that signals its arrival as a mainstream connectivity solution.
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LoRaWAN® Reaches Critical Mass: 125 Million…
A Growing Crisis Demands Smart Solutions
Spain loses 25% of its water to leaks1. Portugal loses 33%2. Meanwhile, Catalonia's reservoirs have reached historic lows and Portugal's Algarve region has imposed severe restrictions with dams at just 20% capacity.The Iberian Peninsula faces a growing water crisis.
Spain has emerged as a significant adopter of Advanced Metering Infrastructure with LoRaWAN® as the leading choice of IoT connectivity, with over 647,000 LoRaWAN-enabled water meters already deployed—and the European Union (EU) is backing expansion through its Strategic Projects for Economic Recovery and Transformation (PERTE) funding program.
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The evolution of smart metering has transformed how utilities collect and manage metering and consumption data. At the heart of this digital transformation of utilities lies the wireless M-Bus (wM-Bus) protocol, a wireless communication protocol for automated meter reading that has been adopted for over 20 years through the standard defined by the European Normalization Committee (CEN) under the standard series EN13757, encompassing Europe and beyond. In this blog post, we'll explore our recent demo featuring the Semtech LR1121 and LR2021, and discuss how enabling the dual connectivity for wM-Bus and LoRaWAN® is today’s demand of utilities for Smart Metering.
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wM-Bus and LoRaWAN® Demo with LR1121 and LR2021
The 2010s marked a defining decade for Semtech as the company accelerated its transformation into a connectivity and sensing powerhouse. Building on the foundation established in previous decades, Semtech made strategic moves that positioned it at the forefront of several high-growth technology markets, including the Internet of Things (IoT), advanced surge protection and high-speed optical networking.
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Electronica India 2025, held from September 17–19 at the Bangalore International Exhibition Centre (BIEC), was a resounding success.
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Electronica India 2025: Semtech Advancing…
The Things Conference 2025, held in Amsterdam, attracted over 2,000 participants, featured 180 speakers and 250 presentations, making it a significant event in the IoT calendar. Semtech was notably prominent, reflecting its leadership in the LoRa® ecosystem. The conference highlighted the growing global adoption of LoRa technology, with Semtech's advancements in LoRa Plus™ and 4th-generation devices underscoring its commitment to innovation and scalability in Internet of Things (IoT) solutions. The event served as a platform for industry leaders to discuss the future of IoT connectivity, emphasizing the role of LoRa in enabling the multiple verticalsrelyingon IoTto enhance operational efficiencies and sustainability.
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The Things Conference 2025: LoRa® Ecosystem…Talk With Us Today
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