Overview
The SX1281 transceiver provides ultra long range communication in the 2.4GHz band with the linearity to withstand heavy interference. This makes them the ideal solution for robust and reliable wireless solutions.
Features
- Long Range 2.4GHz transceiver
- High sensitivity, down to -132dBm
- +12.5dBm, High efficiency PA
- Low energy consumption, On-chip DC-DC
- LoRa, FLRC, (G)FSK supported modulations
- Programmable bit rate
- Excellent blocking immunity
- BLE PHY layer compatibility
- Low system cost
Packaging
- QFN 4x4
Order Codes
- SX1281IMLTRT: Pb-free, Halogen free, RoHS and WEEE compliant, 3,000 pieces. Tape & Reel
PB Free/ROHS
Learn More →
| Documents | Release Date | Type |  |
|---|---|---|---|
| SX1281 Datasheet | 2023-10-27 | | |
| AN1200.30: Wi-Fi Immunity of LoRa at 2.4 GHz | 2018-12-21 | | |
| AN1200.41: Using the SX1280/SX1281 in Low Power Applications | 2019-07-03 | | |
| AN1200.44: Bluetooth Immunity of LoRa at 2.4 GHz | 2019-07-04 | | |
| AN1200.59 - Selecting the Optimal Reference Clock v1.7 | 2025-09-15 | | |
| AN1200.77: Optimizing Channel Activity Detect (CAD) on SX1280/81 | 2023-11-10 | | |
| AN1200.80: LoRa® Modem Doppler Immunity | 2023-10-26 | | |
| Miniaturized SX1280/SX1281 Design with Johanson Technology IPD (Schematics, Layout, BOM) | 2019-07-04 | ZIP | |
| Shield: SX1280/81RF1ZHP Reference Design | 2020-03-24 | ZIP | |
| SX1280/81 Dev Kit User Guide | 2019-11-12 | | |
| User Guide for the SX1280/1 Development Kit | 2019-11-12 | | |
| Documents | Release Date | Type | |
|---|---|---|---|
| SWL2001 - LoRa Basics Modem Library | 2024-05-14 | TXT | |
| SX1281 PingPong Application Source Code in C | 2019-04-18 | ZIP | |
| SX1280/81 LoRa Calculator | 2023-06-23 | ZIP | |
Click diagram to enlarge
Inventory
| Product | Country | Distributor | Qty | Buy |
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Resources
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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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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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