# 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.

[HTML version](https://soldr.ai/docs/components/ra-02)

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Ai-Thinker Ra-02, a 16-pad SMD LoRa transceiver module for 410-525 MHz with an SPI interface and an IPEX antenna connector.

Every value cites its sourcePinout not published

[Buy on Compoden](https://compoden.com/products/ra-02-lora-module-433470mhz-sx1278-spi-for-arduino-iot)

## 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](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20wireless%20temperature%20link%20between%20two%20ESP32%20boards%20using%20LoRa%20modules%20and%20a%20DS18B20%20temperature%20sensor): 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](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20garden%20soil%20moisture%20reporter%20that%20sends%20readings%20over%20LoRa%20from%20an%20ESP32%20with%20a%20capacitive%20soil%20moisture%20sensor): Learning project. The ESP32 has an ADC for the analog probe and 3.3 V logic for the module.
- [LoRa range test display](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20LoRa%20range%20tester%20that%20shows%20received%20packet%20counts%20on%20an%20OLED%20display%20with%20an%20ESP32): Two nodes send numbered packets; the OLED on the receiver shows how many arrive at each distance.
- [Remote LED switch over LoRa](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20remote%20LED%20switch%20that%20toggles%20over%20LoRa%20between%20two%20ESP32%20boards): 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](https://aithinker-static.oss-cn-shenzhen.aliyuncs.com/docs/Public%20Document%20Center/LoRa/lora/Specification/Ra-02_V1.1%20Specification-20171219.pdf), 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](https://aithinker-static.oss-cn-shenzhen.aliyuncs.com/docs/Public%20Document%20Center/LoRa/lora/Specification/Ra-02_V1.1%20Specification-20171219.pdf), 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](https://aithinker-static.oss-cn-shenzhen.aliyuncs.com/docs/Public%20Document%20Center/LoRa/lora/Specification/Ra-02_V1.1%20Specification-20171219.pdf), 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.

## Sources

- [link](https://aithinker-static.oss-cn-shenzhen.aliyuncs.com/docs/Public%20Document%20Center/LoRa/lora/Specification/Ra-02_V1.1%20Specification-20171219.pdf) (Ai-Thinker Ra-02 LoRa Product Specification V1.1, 2017-12-19)
- [link](https://cdn.sparkfun.com/assets/7/7/3/2/2/SX1276_Datasheet.pdf) (Semtech SX1276/77/78/79 datasheet Rev 7, May 2020; a hosted copy)