📝 Meta Description
Coral RF provides a full range of license-free ISM band modules (169/433/868/915MHz) with output power up to +35dBm and range up to 15km. Easy SPI/UART integration, low power consumption. Ideal for industrial control, IoT, and long‑range telemetry. Order samples today!
🏠 Product Introduction
The ISM (Industrial, Scientific, Medical) band refers to a series of license-free radio frequency bands open for industrial, scientific, and medical applications. These bands are divided by region: Europe and Asia commonly use 169MHz, 433MHz, 868MHz, and 915Mhz. while North America primarily uses 915MHz (also includes 315MHz, 470MHz, 920MHz, and 2.4GHz). Using the ISM band means no license application, no recurring fees, making it the preferred choice for a wide range of wireless devices and greatly reducing product development and deployment costs.
Coral RF is a global leader in license‑free radio technology, offering a full range of high‑performance wireless modules covering all major ISM bands. Our modules are built on industry-leading chip platforms from Texas Instruments, Semtech, and Silicon Labs, and feature a 4-layer PCB design that ensures excellent impedance matching and outstanding noise immunity, guaranteeing reliable data transmission even in the harshest environments.
📊 Specifications (Example: N515BS‑B)
| Parameter | Value |
|---|---|
| Frequency | 169/433/868/915 MHz |
| Output Power | +26 dBm (~400 mW) |
| Sensitivity | -125 dBm @ 1.2 kbps |
| Data Rate | 0.3 – 200 kbps (software selectable) |
| Range | 5000 m (line-of-sight, 3 dBi antenna) |
| Supply Voltage (VCC) | 1.8 – 3.6 V |
| PA Supply Voltage | 2.8 – 6 V |
| Tx Current | ~200 mA |
| Rx Current | 27 mA |
| Sleep Current | 2 µA |
| Operating Temp | -40°C to +85°C |
| Dimensions | 29.5 × 21 × 3 mm |
| Interface | SPI |
| Antenna Option | IPEX / stamp hole |
🔑 Key Advantages
✅ License‑free ISM bands – No application fees, fast time‑to‑market
✅ Long range (up to 15 km) – Sub‑1GHz penetrates walls and foliage better than 2.4GHz
✅ High output power (up to +35dBm / 3.2W) – For extreme range applications
✅ Low power consumption – Rx current down to 4.6 mA, sleep current down to 0.2 µA
✅ Excellent sensitivity (-125 dBm) – Reliable detection of weak signals
✅ Standard SPI / UART interface – Easy integration with any MCU (ESP32, Arduino, STM32, etc.)
✅ 4‑layer PCB design – Superior impedance matching and noise immunity
✅ Compact SMD package – As small as 29.5×21×3 mm, saving valuable board space
🔧 Model & Ordering Information
| Model | Chipset | Frequency | Output Power | Interface | Typical Range | Best For |
|---|---|---|---|---|---|---|
| N503AS | CC1101 | 433/868/915MHz | +10 dBm | SPI | 500m | Low‑cost, low‑power sensors |
| N515BS‑B | CC1125 + PA/LNA | 169/433/868/915MHz | +26 dBm | SPI | 5km | Industrial control, IoT, window cleaning robots |
| N518BS‑B | CC1125 + high‑gain PA | 150‑160 MHz | +35 dBm | SPI | 15km+ | SCADA, critical alarms, long‑range telemetry |
| N622PA | CC1312R7 | 868/915MHz | +27 dBm | SPI/UART | 8km | Smart grid, agricultural IoT, remote broadcast |
| N704CS | CC2674R10 + CC2592 | 2.4 GHz | +22 dBm | SPI/UART/ADC | 1.5km | Zigbee, BLE, Thread, voice‑enabled gateways |
| SX1262 series | SX1262 (LoRa) | 433/868/915MHz | +22 dBm | SPI | 10km+ | LoRaWAN, long‑range low‑power sensor networks |
📦 Package & Customization Options
Standard Package: SMD (stamp hole) – RoHS & halogen‑free compliant
Form Factors: USB Dongle (for direct PC connection), Raspberry Pi carrier board
Customization: OEM/ODM small‑batch customization, firmware pre‑programming, specific frequency tuning
Support: Datasheets, reference schematics, PCB layout guide, and software driver examples provided
💡 Frequently Asked Questions (FAQ)
1. Does using an ISM radio module require an application or license?
No, ISM bands are license‑free in most major markets (FCC in the US, ETSI in Europe). However, you must ensure your device complies with regional radio certification (e.g., FCC Part 15, CE RED). But no per‑device license or recurring fee is required.
2. What is the difference between 433MHz, 868MHz and 915MHz?
433MHz is widely used in Europe and Asia and offers better wall penetration. 868MHz is the primary band for Europe (under ETSI EN 300 220), offering higher allowed transmit power and less congestion. 915MHz is the primary band for North America (under FCC Part 15), offering similar range and power to 868MHz. Choose based on your target market.
3. How do I integrate this module with my MCU?
All modules use a standard SPI or UART interface. We provide driver code examples and reference designs for popular MCUs such as ESP32, Arduino, STM32, and Raspberry Pi. Simply connect VCC, GND, SPI pins (MOSI, MISO, SCK, CS) and you’re ready to start transmitting and receiving data.
4. What is the maximum range I can achieve?
Range depends on environment and data rate. In open line‑of‑sight conditions with a 3 dBi antenna, our modules can achieve up to 5000m (N515BS‑B) to 15km+ (N518BS‑B). In urban or indoor environments, expect shorter range due to obstacles and interference.
5. Do you provide technical support and documentation?
Yes, we provide complete datasheets, reference schematics, PCB layout guide, software driver examples, and application notes. Our technical support team is available to answer any questions during your development cycle.
6. Can I use these modules for audio transmission?
Yes, with appropriate data rates (up to 200 kbps) and external audio codec, these modules can be used for long‑range audio transmission such as intercom systems, remote broadcast control, or real‑time voice links. For low‑latency applications, we recommend N515BS‑B or CC2674‑based modules.
🤝 Contact & Ordering
Website: https://www.coralradio.com
Request Sample: Select model and quantity – minimum order quantity available for development
Quote Request: For volume pricing (100+ units) or OEM/ODM customization
Technical Support: datasheets, reference schematics, PCB layout guide, and software driver examples
✨ All Coral RF products are RoHS & halogen‑free compliant, available in SMD package, USB Dongle, and Raspberry Pi carrier board. OEM/ODM small‑batch customization is accepted.