Semtech SX1272
Long Range, Low Power RF Transceiver 860-1000 MHz with LoRa® Technology

The SX1272/73 transceivers feature the LoRa® long range modem that provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.
Overview
Features
- LoRa Modem
- 157 dB maximum link budget
- +20 dBm at 100 mW constant RF output vs. V supply
- +14 dBm high efficiency PA
- Programmable bit rate up to 300 kbps
- High sensitivity: down to -137 dBm
- Bullet-proof front end: IIP3 = -12.5 dBm
- 89 dB blocking immunity
- Low RX current of 10 mA, 100 nA register retention
- Fully integrated synthesizer with a resolution of 61 Hz
- FSK, GFSK, MSK, GMSK, LoRa and OOK modulation
- Built-in bit synchronizer for clock recovery
- Preamble detection
- 127 dB Dynamic Range RSSI
- Automatic RF Sense and CAD with ultra-fast AFC
- Packet engine up to 256 bytes with CRC
- Built-in temperature sensor and low battery indicator
Applications
- Automated Meter Reading
- Home and Building Automation
- Wireless Alarm and Security Systems
- Industrial Monitoring and Control
- Long range Irrigation Systems
Packaging
- QFN 28
Order Codes
- SX1272IMLTRT - Pb-free, Halogen free, RoHS/WEEE compliant product
- SX1273IMLTRT- Pb-free, Halogen free, RoHS/WEEE compliant product
- SX1272DVK1BAS (868MHz)
- SX1272DVK1CAS (915MHz)
- SX1272RF1BAS (868MHz)
- SX1272RF1CAS (915MHz)
Diagrams and Specs
Datasheets and Resources
Application Notes
- AN1200.13 and AN1200.17 LoRa Modem Design
- APP Note Crystal Oscillator Guidance LoRa Modulation V2.2
- Designing for High Efficiency and Low-Harmonic Emissions
- ETSI Compliance of the SX1272/3 LoRa Modem
- LoRa and FCC Part 15.247: Measurement Guidance
- LoRa Modulation Basics
- LoRa Modulation: Crystal Oscillator Guide
- MCU Requirements for LoRaWAN
- Planar F-Antenna Reference Design
- Reading Channel RSSI During a CAD
- Recommended SX1272 Settings for EU868 LoRaWAN Network Operation
- Software Implementation of Data Whitening and CRC
- SX1272 LoRa Calculator
- SX127x Reference Design Overview
- Testing for FCC Pre-Compliance with LoRaWAN Modules
Datasheets
Errata
Reference Designs
- SX1272 Modules: SX1272MB1DCS - 868 MHz - Combined RFI and RFO, Switchless (Ref Design Only)
- SX1272 Modules: SX1272MB2DAS - 868 or 915 MHz - Combined RFI and RFO Design
- SX1272 Modules: SX1272RF1xAS - 868 or 915 MHz - Combined RFI and PA_BOOST Design
Software Releases (Firmware)
- Firmware Driver and LoRaWAN Stack V4.1.0
- Firmware Drivers V2.1.0 - LEGACY, DO NOT USE FOR NEW IMPLEMENTATION
- Packet Error Rate Firmware
- PC GUI (2.0.0.Beta3)