The Ebyte E28-2G4T series is a high-performance 2.4GHz UART wireless serial transmission RF module powered by the Semtech SX1281 chip, incorporating LoRa, FLRC, and GFSK modulations to achieve long-range coverage up to 3.0km, superior anti-interference performance, 12.5dBm transmit power, low power consumption, and flexible 3.3V/5V TTL IO compatibility for industrial IoT and embedded applications.
| Parameter / Model | E28-2G4T12S | E28-2G4T27SX |
|---|---|---|
| RF Transceiver IC | Semtech SX1281 | Semtech SX1281 |
| Operating Frequency | 2.4GHz - 2.5GHz | 2.4GHz - 2.5GHz |
| Tx Power | 12.5 dBm | 27 dBm |
| Modulation Modes | LoRa, FLRC, GFSK | LoRa, FLRC, GFSK |
| Communication Interface | UART (TTL) | UART (TTL) |
| IO Voltage Compatibility | 3.3V TTL | 3.3V and 5V compatible |
| Antenna Interface | IPEX / On-board PCB Antenna | IPEX / On-board PCB Antenna |
| Transmission Distance | 3.0 km (Clear and open area) | Longer range (Power-amplified) |
| Package & Dimensions | SMD, 17.5 x 28.7 mm | SMD, 17.5 x 28.7 mm |
| Weight | 2.2 +/- 0.1g | 2.2 +/- 0.1g |
| RF Parameter | Value | Remark |
|---|---|---|
| Working frequency | 2400~2500 MHz | ISM band |
| Transmitting power | 12.5 dBm | - |
| Receiving sensitivity | -132 dBm | Air data rate: 1.0kbps |
| Modulation | LoRa FLRC GFSK |
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| Test distance | 3000m | Test condition：clear and open area, antenna gain: 5dBi，antenna height: 2.5m，air data rate: 1kbps |
| Hardware Parameter | Value | Remark |
|---|---|---|
| Size | 17.5 * 28.7 mm | - |
| Antenna type | IPEX / PCB | 50Ω Impedance |
| Communication interface | UART | TTL |
| Package | SMD | - |
| Electronic parameter | Min. | Typ. | Max. | Unit | Condition |
|---|---|---|---|---|---|
| Power supply | 2.3 | 5.0 | 5.5 | V | ≥5.0V ensures output power |
| Communication level | - | 3.3 | - | V | For 5V TTL, it may be at risk of burning down |
| Transmitting current | - | 46 | - | mA | Instant power consumption |
| Receiving current | - | 20 | - | mA | - |
| Sleep current | - | 8 | - | μA | Software is shut down |
| Operating temperature | -40 | 20 | +85 | ℃ | - |
| Operating humidity | 10 | 60 | 90 | % | - |
| Storage temperature | -40 | 20 | +125 | ℃ | - |
Practical Application Scenarios
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Industrial Wireless Data Acquisition and Telemetry
In smart factory automation, the E28-2G4T series module serves as a reliable wireless bridge connecting remote PLC units, sensor arrays, and edge gateways. Leveraging FLRC and LoRa modulation options on the 2.4GHz ISM band, it delivers high-speed transparent data transmission while mitigating severe co-channel interference caused by crowded industrial Wi-Fi environments.
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Commercial UAV and Drone Real-Time Telemetry Links
For unmanned aerial vehicles (UAVs) and robotics, low-latency, real-time command, control, and telemetry are critical. The E28-2G4T module utilizes Semtech SX1281 technology to maintain robust bi-directional radio communication over distances up to 3.0km, enabling stable flight data stream transmission and remote gimbal or payload control under lightweight footprint constraints.
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High-Density Smart Agriculture Sensor Networks
In automated greenhouse monitoring and precision farming systems, battery-powered wireless nodes collect soil moisture, temperature, and solar irradiance metrics. The ultra-low power sleep current and long-range capability of the E28-2G4T series allow battery-operated agricultural node deployments across vast farmlands without frequent battery replacements or complex cable routing.
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Smart Energy and Substation Asset Monitoring
In power distribution networks and smart grid infrastructure, the E28-2G4T27SX variant provides seamless level shifting for 5V industrial controllers. Its high RF immunity and reliable UART interface make it ideal for transmitting switchgear status, temperature monitoring data, and fault alerts from high-voltage substation monitoring points back to central data collectors.
FAQ Section
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What are the key performance differences between LoRa, FLRC, and GFSK modulations in the SX1281-based E28 module?
The E28-2G4T module leverages Semtech's SX1281 chip to offer three distinct modulation modes: LoRa provides the longest range (up to 3.0km) and highest receiver sensitivity for noise-heavy environments; Fast Long Range Communication (FLRC) delivers high data throughput with low latency and moderate range; GFSK provides standard legacy compatibility and maximum spectral efficiency for short-range point-to-point links.
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How does the IO level compatibility differ between E28-2G4T12S and E28-2G4T27SX?
The E28-2G4T12S operates strictly with 3.3V TTL logic signals on its UART interface, requiring external logic-level converters when interfacing with 5V microcontrollers like traditional Arduino or 5V PLC systems to prevent hardware damage. In contrast, the E28-2G4T27SX features dual-level IO voltage tolerance, allowing direct pin connection to both 3.3V and 5V MCU logic ports without additional level-shifting components.
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What power supply design considerations should be followed to achieve maximum transmit performance?
To ensure the module reaches its nominal transmit power and optical range, the power supply must deliver a stable voltage within the recommended operating range (greater than or equal to 5.0V for maximum Tx output power). Decoupling capacitors (such as a combination of 10uF and 100pF) should be placed close to the power supply pins to suppress voltage ripple and transient current spikes during RF burst transmissions.
