EBYTE E49-900M20S is a cost-effective wireless data transmission module launched by Chengdu Ebyte. It is a pure hardware module based on CMT2300A. E49-900M20S supports a maximum transmit power of 20dBm, and users can set a lower output power to save power consumption. Works in the 850MHz~930MHz frequency band.
Compliance: Supports 868MHz (EU) and 915MHz (North America) ISM bands for compliance with regional radio regulations.
Power efficiency: Low power mode (300nA sleep current) meets the needs of battery-powered devices for long-term deployments.
Reliability: Industrial-grade temperature range (-40°C to +85°C) ensures extreme environmental stability, and anti-simultaneous interference design reduces packet loss.
Security: Supports data encryption (requires user development) to avoid the risk of unauthorized access.
Integration Flexibility: Dual antenna interface (stamp hole/IPEX) simplifies PCB design, 14mm x 20mm size for compact devices.
Detailed Parameters
Chip solution: based on CMT2300A pure hardware design, SPI interface driver, external MCU required
Operating frequency band: 850-930MHz (covering 868MHz/915MHz global license-free ISM bands)
Transmit power: Maximum 20dBm (adjustable in multiple levels by software, which reduces the power consumption)
Data transmission rate: 0.5Kbps -300Kbps (supports GFSK/OOK/(G)MSK modulation)
Supply voltage: 2.6V-3.6V (3.3V recommended, >3.6V may be permanently damaged)
Power Consumption
Transmit current: ≤89mA (@20dBm)
Receive current: 8.5mA (typical)
Hibernation current: 300nA (deep hibernation)
Receive sensitivity: -117dBm (@1.2kbps air rate)
Distance: Measured 3km (clear and open environment, antenna height 2.5m, 2.4kbps rate)
Mechanical Characteristics
Size: 20×14mm (SMD package)
Antenna interface: stamp hole/IPEX (50Ω impedance)
Weight: 1.2±0.1g
Environmental Adaptability
Operating Temperature: -40°C to +85°C (Industrial Grade)
Humidity/Co-channel Interference Protection: Supports harsh industrial environments
Application Scenarios
1. Smart home: temperature and humidity sensors, security systems
2. Industrial automation: sensor data return (such as pressure, flow monitoring)
3. Remote control: drone, wireless game remote control
4. Medical equipment: low-power health monitoring products
5. Automotive electronics: tire pressure monitoring, on-board diagnostic system
Detailed parameters
| Main Parameters | Performance | Remarks | |
| Min. | Max | ||
| Power supply（V） | 2.6 | 3.6 | Voltage over 3.6V will cause permanentdamage to module |
| Operating temperature（℃） | -40 | 85 | / |
| Main Parameters | Performance | Remarks | ||
| Min. | Typical | Max | ||
| Operating voltage（V） | 1.8 | 3.3 | 3.6 | Over 3.6V may permanently burn the module |
| Communication level（V） | - | 3.3 | - | Using 5V level has the risk of burning |
| Operating temperature（℃） | -40 | - | +85 | Industrial design |
| Operating frequency（MHz） | 410 | 433 | 510 | - |
| TX Current(mA) | - | 85 | @Transmit power20dBm | Instant power consumption |
| RX current（mA） | - | 8.5 | - | - |
| Sleep current（nA） | 300 | 300 | 800 | Software is shut down |
| Max Tx power（dBm） | - | 20 | - | - |
| Receiving sensitivity（dBm） | -116 | -117 | -118 | @Air rate is 1.2kbps |
| Main parameter | Description | Remarks |
| Reference distance | 2.5km | Clear and open, antenna height 2.5 meters, air rate 2.4kbps |
| Crystal frequency | 26MHz | - |
| Packaging method | SMD | - |
| Communication Interface | SPI | - |
| Dimensions | 20*14mm | - |
| RF interface | IPEX/stamp hole | Equivalent impedance is about 50Ω |
| product weight | 1.2±0.1g | Clear and open, antenna height 2.5 meters, air rate 2.4kbps |
Pin parameters
| No. | Item | Direction | Description |
|---|---|---|---|
| 1 | GND | - | Ground |
| 2 | GND | - | Ground |
| 3 | GND | - | Ground |
| 4 | GND | - | Ground |
| 5 | GPIO1 | DI/O | Configurable multi-function IO port（see CMT2300A manual for details） |
| 6 | RXEN | DI/O | Configurable multi-function IO port（see CMT2300A manual for details） |
| 7 | TXEN | DI/O | Configurable multi-function IO port（see CMT2300A manual for details） |
| 8 | VCC | - | Power supply +3.3V |
| 9 | VCC | - | Ground |
| 10 | VCC | - | Ground |
| 11 | SCLK | DI | SPI clock pin |
| 12 | SDIO | DI/O | SPI data pin |
| 13 | CSB | DI | SPI register accesser |
| 14 | FCSB | DI | SPI FIFO accesser |
| 15 | GND | - | Ground |
| 16 | GND | - | Ground |
| 17 | ANT | - | RF module stamp hole interface，impedance 50Ω |
| 18 | GND | - | Ground |
