RAK3172 LoRa module — STM32WLE5CC, 868/915MHz, UART/SPI/I2C, AT commands, ultra-low power, SMD

The RAK3172 is a compact, ultra-low-power LoRa/LoRaWAN module from RAKwireless, built around the STMicroelectronics STM32WLE5CC SoC — a single-chip solution integrating an Arm Cortex-M4 processor with a sub-GHz radio transceiver. It supports LoRaWAN Class A, B, and C operation and is controlled via a simple AT command interface over UART, making it straightforward to integrate into any microcontroller-based IoT design without requiring deep RF expertise.

Operating in the 863–928MHz frequency range, the RAK3172 covers the EU868, US915, AU915, AS923, IN865, and KR920 LoRaWAN bands, making it suitable for global IoT deployments. Its ultra-low sleep current (approximately 1.69μA) makes it ideal for battery-powered sensor nodes requiring years of operation on a single cell.

Key Specifications:

• Part number: RAK3172
• Core: STM32WLE5CC (Arm Cortex-M4 + sub-GHz radio SoC)
• Frequency range: 863–928MHz (EU868, US915, AU915, AS923, IN865, KR920)
• Modulation: LoRa, (G)FSK
• LoRaWAN class: A, B, C
• TX power: up to +22dBm
• Receiver sensitivity: −148dBm (SF12, 125kHz BW)
• Interface: UART (AT commands), SPI, I2C, GPIO
• Sleep current: ~1.69μA
• Supply voltage: 2.0–3.6V
• Package: SMD stamp-hole module
• Dimensions: 15 × 15.5 × 3.5mm
• Certifications: CE, FCC, ISEDC, RCM, KC

Key Features:

• STM32WLE5CC SoC — integrated Cortex-M4 + LoRa radio; no external MCU required for standalone operation
• AT command interface — simple UART control from any host MCU; no LoRa stack expertise needed
• LoRaWAN Class A/B/C — full LoRaWAN stack support for network-connected IoT applications
• Ultra-low sleep current (~1.69μA) — years of battery life for remote sensor nodes
• +22dBm TX power — long-range communication up to several kilometres in open environments
• −148dBm sensitivity — excellent link budget for deep indoor and underground deployments
• Global frequency support — single module covers EU, US, AU, AS, IN, KR LoRaWAN bands
• SMD stamp-hole footprint — easy PCB integration with reflow soldering

Applications:

• LoRaWAN IoT sensor nodes (temperature, humidity, GPS, soil moisture)
• Smart agriculture and precision farming
• Industrial asset tracking and monitoring
• Smart metering (water, gas, electricity)
• Building automation and smart city infrastructure
• Long-range wireless data logging

Note: The RAK3172 operates at 2.0–3.6V — a 3.3V regulated supply is recommended. Default UART baud rate is 115200bps. An external antenna (SMA or IPEX) is required — not included.