Ra-02 LoRa module (433 MHz): specs
Ai-Thinker Ra-02, a 16-pad SMD LoRa transceiver module for 410-525 MHz with an SPI interface and an IPEX antenna connector.
Specs
| Spec | Value | Source |
|---|---|---|
| Frequency range | 410-525 MHz | source Product Specifications table, p.2 |
| Power supply | 2.5 to 3.7 V, typical 3.3 V | source Product Specifications table, p.2 |
| Interface | SPI (half-duplex) | source Product Specifications table, p.2; Features, p.1 |
| Max transmit power | 18 +/-1 dBm | source Product Specifications table, p.2 |
| Typical current at 433 MHz | TX 93 mA, RX 12.15 mA, standby 1.6 mA | source Product Specifications table, p.2 |
| Typical current at 470 MHz | TX 97 mA, RX 12.15 mA, standby 1.5 mA | source Product Specifications table, p.2 |
| Receive sensitivity at 433 MHz | -125 dBm (SF7), -134 dBm (SF10), -141 dBm (SF12); 125 kHz bandwidth, 20 dBm output | source Receive Sensitivity table, p.2 |
| Programmable bit rate | up to 300 kbps | source Product Specifications table, p.2 |
| Operating temperature | -30 to 85 C | source Product Specifications table, p.2 |
| Antenna connector | IPEX | source Product Specifications table, p.2 |
Power
| Value | Source | |
|---|---|---|
| Supply | 2.5-3.7 V, typical 3.3 V | source Product Specifications table, p.2 |
| Current | TX 93 mA (433 MHz) / 97 mA (470 MHz); RX 12.15 mA; standby 1.6 / 1.5 mA | source Product Specifications table, p.2 |
Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.
The Ai-Thinker Ra-02 specification (V1.1, 2017-12-19) has no pin table, and the Ai-Thinker documentation does not publish one. Pin names are not listed here. Check the module markings or the Ai-Thinker footprint package (PCB_Ra-02 V1.4) before wiring. Whether the listed product is the bare module or a breakout board with a different header is not covered by an official document.
Build with it
Project ideas for the Ra-02 LoRa module (433 MHz). Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.
- Remote temperature link between two ESP32 boards: ESP32 boards use 3.3 V logic, matching the module supply of 2.5-3.7 V. Each end needs its own Ra-02 on the same band.
- Garden soil moisture reporter: Learning project. The ESP32 has an ADC for the analog probe and 3.3 V logic for the module.
- LoRa range test display: Two nodes send numbered packets; the OLED on the receiver shows how many arrive at each distance.
- Remote LED switch over LoRa: A button on one board sends a packet; the other board lights an LED through a resistor. Low current, 3.3 V only.
Common mistakes
- Powering it from 5 V: the module supply is 2.5-3.7 V (typical 3.3 V), so use a 3.3 V supply and 3.3 V logic; a 5 V Arduino board needs level shifting on the SPI lines. (source: link, p.2)
- Expecting 868 or 915 MHz: this module covers 410-525 MHz only (433 and 470 MHz variants in the sheet), and both ends of a link must use the same band. (source: link, p.2)
- Sizing the 3.3 V supply for the average current: typical transmit current is 93-97 mA, against 12.15 mA in receive. (source: link, p.2)
Not covered by the official source
- No official pin table for the Ra-02 found; pinout left empty.
- The Ai-Thinker Ra-02 specification does not name a radio chip, so none is stated on this page; the store title mentions SX1278 and should keep it only after the chip marking on the stocked module is checked.
- Ai-Thinker's English documentation pages carry no pin table.
- Module limits above come from Ai-Thinker only; no chip-level datasheet is used for module claims.