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1. Product Introduction
▫️ Key Features
Ra-20
The Ra-20 is an ultra-high-performance RF front-end module designed for IoT, short-range wireless communication, and Industry 4.0 wireless sensor networks, featuring the SEMTECH fourth-generation LoRa Plus™ LR2021 RF chip as its core. Its key advantage lies in an ultra-compact package and extreme RF performance. By optimizing the collaborative design of power amplifier, low-noise amplifier, filter, and peripheral matching network, it achieves high power, low loss, low spurious emissions, and strong anti-interference capability, while meeting mainstream global regulatory certification requirements.
The Ra-20 module supports Sub-GHz and 2.4GHz ISM bands. It features three key capabilities: ultra-long-range transmission, high-speed data throughput, and global single-SKU adaptability.
▫️ Technical Highlights
RF Performance
- Transmit power: measured maximum transmit power of 21.5dBm@Sub-GHz, 12dBm@2.4GHz
- Power flatness: ≤ ±0.5dBm. Stable full-band and full-power transmission and the power level is software-adjustable in multiple steps.
Receiver sensitivity:
- Sub-GHz: up to -147dBm@BWLORA = 31kHz/SF12/CR4/5 (refer to chip datasheet); measured -122.5dBm@BWLORA = 400kHz/SF7/CR4/5
- 2.4GHz: up to -137.5dBm@BWLORA = 200kHz/SF12/CR4/5 (refer to chip datasheet); measured -120dBm@BWLORA = 400kHz/SF7/CR4/5
- Frequency offset tolerance: ±33% BW, far exceeding the previous generation’s ±25% BW. High-precision frequency stability can be achieved without a TCXO.
- Harmonic suppression: 490MHz@22dBm 2nd and 3rd harmonics ≤ -68dBc, 2450MHz@12dBm 2nd and 3rd harmonics ≤ -66dBc, with sufficient margin to pass CE, FCC and other regulations.
- Operating Bands
- Low-frequency band: China default 470 – 510MHz (433MHz can be customized )
- High-frequency band: China default 2400 – 2500MHz
Power Consumption
- Sleep current: ≤ 2μA (average value: 1.65)
- Receive current: ≤ 6mA
- Transmit current: Sub-GHz@12dBm 125.8mA; 2.4GHz@12dBm 27mA
Communication and Protocols
- Data rate: FLRC up to 2.6Mbps; LoRa up to 125kbps
- Supports fourth-generation LoRa IP technology and LR-FHSS
- Protocol compatibility ( Only the physical layer is supported; the protocol layer needs to be developed by the customer):
- LoRa/LoRaWAN® (Sub-GHz + 2.4GHz)
- Bluetooth® LE 5.0
- IEEE® 802.15.4 (Thread®/Zigbee™)
- Wi-SUN, Wireless M-BUS, Z-Wave, etc.
Physical Characteristics
- Package: SMD-20
- Module dimensions (L × W × H): 20.00 × 16.00 × 3.20mm
- Antenna type: IPEX MHF 1 connector
- Operating temperature: -40 – 85℃
- Storage conditions: -40 – 125℃, < 90% RH
Electrical Characteristics
- Supply voltage: 1.8 – 3.6V (typical value 3.3V)
- Supply current: > 200mA
- Communication interface: standard SPI interface
- Available I/Os: 7 GPIOs are brought out by default
- Protection: built-in ESD protection circuit
▫️ Selection Table
Multi-select supported. Exported images include all selected products.
| Parameter |
|---|
| Product Image |
| Wireless Protocol |
| Chip |
| Module Flash Size (Mbits) |
| Frequency Band (MHz) |
| Package |
| Dimensions (L×W×H) (mm) |
| Operating Temp Range (℃) |
| Storage Temp Range (℃) |
| Antenna Type |
| Interface |
| Available GPIO |
| Min Voltage (V) |
| Max Voltage (V) |
| Typical Voltage (V) |
| Max Current (mA) |
| Rx Current (mA) |
| Standby Current (μA) |
| Sleep Current (μA) |
| Certifications |
| Max TX Power (dBm) |
| Modulation |
| Max Distance (m) |
| Protocol Support |
2. About Modules
| Module | Datasheets | PCB Footprints |
|---|---|---|
| Ra-20 | View | Download |
3. STM32F103C8T6 HAL-based driver
| Module | Link |
|---|---|
| Ra-01SC | Download |
4. Certification Related
| Module | Certificate | Link |
|---|---|---|
| Ra-20 | CE (RED) | View |
| Ra-20 | FCC | View |