Product information


Long Range Radio Module

The iM881A-M is a compact and low-cost radio module that operates in the unlicensed 868 MHz band and combines a powerful Cortex-M0 controller with the new LoRa™ transceiver SX1272 of Semtech Corporation. It has been specifically designed for battery driven devices. It consumes 40 mA in transmit with the maximum output power of +14dBm. Combined with an excellent sensitivity of down to -138 dBm a range of 12 km can be achieved in free space environment. The iM881A-M is pre-certified according the European R & TTE guideline and can be soldered like an SMD component. iM881A-M passed the Orange device interoperability test. This test validates the performance of the iM881A-M in the Orange public LoRaWAN network environment.

Key Features

  • Maximum sensitivity ‑138 dBm
  • Range up to 12000 m (LoS)
  • Solderable like a SMD component
  • 50Ω pad for antenna
  • RoHS conform

Application Areas

  • Automated Meter Reading
  • Home and Building Automation
  • Wireless Alarm and Security Systems
  • Industrial Monitoring and Control
  • Long Range Irrigation Systems
  • IoT (Internet of Things)
  • Smart Cities

Technical Data

  1. Frequency range:SRD Band 863 to 870 MHz
  2. Modulation:LoRa™ Spread-Spectrum
  3. RF output power:up to +15 dBm (50Ω pad)
  4. Receiver sensitivity:-138 dBm (SF 12; SB 125 kHz, CR 4/6)-134 dBm (SF 12; SB 250 kHz, CR 4/6)-128 dBm (SF 12; SB 500 kHz, CR 4/6)
  5. RF datarate:0.24 to 37.5 kbps50kbps FSK-modulation
  6. RF range:up to 12000 m (line of sight)
  7. Operating voltage:1.8 V to 3.6 V
  8. Current consumption:1.4 μA (module in sleep, RTC running)11.2 mA (Rx)38 mA (Tx @ 3.0 V/ +14 dBm)
  9. Interfaces:UARTSPI*I²C*RF (LoRa™)
  10. IO's:Digital IOsAnalog Inputs
  11. Dimension (LxWxH):20 x 25 x 3.3mm
  12. Operating temperature:-40°C to +85°C
  13. Certification:Pre-Certified according to ETSI EN 300 220iM881A-M passed the Orange device interoperability test
* This functionality is not part of the standard firmware and only available on demand.

Adobe Reader 9 or newer version is required to view following below PDF files. This is a free program available from the Adobe web site. Follow the download directions on the Adobe web site to get your copy of Adobe Reader.

iM881A Datasheet V1_0 (783.9 KB)
iM880x AN011 RangeTest V1_1 (253.5 KB)
iM880B AN016 RFSettings V1_1 (492.1 KB)
WiMOD LoRaWAN EndNode Modem Feature Spec V1_10 (541.5 KB)
WiMOD LoRaWAN EndNode Modem HCI Spec V1_13 (964.4 KB)

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