Semtech – SX1276: 137-1050MHz Ultra Low Power Long Range Transceiver





The SX127x family with LoRa™ provides significant benefits for range, robust performance, and battery lifetime compared to competing technologies.

The SX127x platform delivers superior system performance for range, battery operation and interference immunity while eliminating the need for repeaters and complex infrastructure, making it ideal for metering, automation, Internet-ofthings (IoT) and machine-to-machine (M2M) applications.

The SX1276, SX1277, and SX1278 are key endnode components in the long range high capacity network system offering from Semtech. The new SX127x platform incorporates LoRa (long range) spread spectrum technology in addition to the traditional GFSK modulation. Spread spectrum technology has been utilized in other applications for a number of years, but has not been available until today as a low cost solution suitable for sensor networks.

Using the LoRa technology, the SX127x family achieves a range of more than 15km (9 miles) in a suburban environment and 2 to 5km (3 miles) in a dense urban environment, while operating under US, EU, Chinese and Japanese regulatory limits. Most deployed systems for metering, security or industrial automation are limited in range to 1 to 2km (less than 1.25 miles) in a suburban environment. The additional range provided by LoRa eliminates the need for repeaters in these applications, significantly simplifying the system design and lowering the total cost of deployment.

The SX1276 covers all the major sub-GHz frequency bands, while the SX1277 is a cost optimized version targeted at applications that utilize data rates from 5kbps to 40kbps, such as security systems. The SX1278 is optimized for the rapidly growing smart meter market in China, using the 470 to 510MHz band.

All devices deliver over 100dB of blocking immunity to out-of-band interfering signals, which is a 15dB advantage over competing devices. Additionally, the SX127x family has a 25dB improvement over FSK devices for rejecting in-band interfering signals. This makes the device especially effective in industrial, scientific and medical (ISM)-band applications such as security and metering, because it provides immunity from sub-GHz frequency 4G/LTE signals. This immunity, combined with the SX127x’s highly linear RF front-end, makes it the most reliable and robust solution for operating in the presence of strong interfering signals.

The fast growth of the IOT/M2M market – predicted by industry analysts to total 50 billion nodes by 2020 – provides a great opportunity for the SX127x with LoRa technology. There is a dramatic need for an improved physical layer in this market for long range, low power for battery operation, and low cost for volume deployment. LoRa is the ideal solution to meet these needs and a great complement to 2G/3G GSM in this rapidly growing market.

The SX127x family supports GFSK, FSK, GMSK and OOK modulation in addition to LoRa, and is designed to support WMBus, IEEE 802.15.4g (SUN), FCC 15.247, ARIB T96/108, EN 300-220 as well as other worldwide standards and regulations.



  • 168dB maximum link budget
  • +20dBm constant RF output vs. V supply
  • +14dBm high efficiency PA
  • Programmable bit rate up to 300kbps
  • High sensitivity: down to -146.5dBm
  • Bullet proof front end: IIP3 = -12dBm
  • 100dB blocking immunity
  • Low RX current of 10mA
  • 200nA register retention
  • Integrated synthesizer with 61Hz resolution
  • Built-in bit synchronizer for clock recovery
  • Sync word recognition
  • Preamble detection
  • 115dB+ dynamic range RSSI
  • Automatic RF sense with ultra fast AFC
  • Packet engine up to 64-bytes with CRC
  • Built-in temperature sensor
  • Low battery indicator

  • Automated meter reading
  • Wireless sensor networks
  • Home and building automation
  • Wireless alarm and security systems
  • Industrial monitoring and control
Part NumberEVK Part NumberFrequencyTarget Market
SX1276IMLTRTSX1276DVK1IAS169M and 868MHzEurope
SX1276IMLTRTSX1276DVK1JAS433M and 868MHzAsia and Europe
SX1276IMLTRTSX1276DVK1KAS490M and 915MHzChina and North America