The Ebyte E103-W08B is a low-power 2.4GHz Wi-Fi and BLE 5.0 serial-to-wireless module powered by dual ARM Cortex-M3/Cortex-M cores, delivering up to 10dBm RF output power, 802.11b Wi-Fi connectivity, TCP, HTTP Client, and MQTT protocol support in a compact SMD package with IPEX antenna interface for smart home and industrial IoT deployments.
| Technical Parameter | E103-W08 | E103-W08B |
|---|---|---|
| Main Architecture | Dual Core (ARM Cortex-M3 + ARM Cortex-M) | Dual Core (ARM Cortex-M3 + ARM Cortex-M) |
| Operating Frequency | 2.4 GHz ISM Band | 2.4 GHz ISM Band |
| Wi-Fi Protocol Standard | IEEE 802.11b | IEEE 802.11b |
| Bluetooth Protocol Standard | Bluetooth 5.0 (BLE) | Bluetooth 5.0 (BLE) |
| Maximum Transmit Power | 10 dBm | 10 dBm |
| Operating Voltage | 3.0V to 3.6V DC (Typ. 3.3V) | 3.0V to 3.6V DC (Typ. 3.3V) |
| Antenna Connection Type | PCB Onboard Antenna | IPEX Generation 1 Connector |
| Communication Interface | UART Serial Port (TTL level) | UART Serial Port (TTL level) |
| Supported Cloud Protocols | TCP, UDP, HTTP Client, MQTT | TCP, UDP, HTTP Client, MQTT |
| Package / Form Factor | SMD Package | SMD Package |
| Operating Temperature | -40 to +85 degrees C (Industrial grade) | -40 to +85 degrees C (Industrial grade) |
| The main parameters | performance |
remark |
| Operating voltage（V） |
2.5~3.6 |
≥3.3V guarantees output power |
| Communication level（V） |
3.3 |
Using 5V TTL is risky to burn |
| Operating temperature（℃） |
-40~+85 |
Industrial-grade design |
| Operating band（GHz） |
2.412~2.472 |
Support for 2.4G bands |
| Maximum transmit powerdBm） |
11~12 |
Test 2.412GHz |
| Emission current（mA） |
130 |
Instantaneous power consumption（2.412GHz） |
| Receive current（mA） |
18 |
Average power consumption received（2.412GHz） |
| Sleep current（μA） |
18 |
dormancy |
| WiFi version |
802.11b |
- |
| Bluetooth version |
LE 5.0EE |
- |
Practical Application Scenarios
1. Smart Home Gateway Provisioning via BLE 5.0 and Wi-Fi Uplink
In home automation systems, end-users require a seamless setup experience when onboarding smart HVAC controllers, intelligent lighting hubs, or security gateways. The E103-W08B utilizes its dual ARM processor architecture to run BLE 5.0 for quick mobile app pairing and network credential provisioning. Once configured, the module switches transparently to transmit serial Modbus/JSON data over 2.4GHz IEEE 802.11b Wi-Fi to AWS or local MQTT brokers, providing reliable edge-to-cloud communication.
2. Hybrid Industrial Gateways Combining Long-Range LoRa with Local Wi-Fi Cloud Connectivity
In distributed industrial facilities, Sub-GHz radio links like Ebyte LoRa DTUs or wireless I/O modules gather sensor telemetry across a wide factory perimeter. To bridge this data to central ERP or SCADA systems, the E103-W08B acts as a local Wi-Fi transmission engine embedded in an Ebyte hybrid gateway motherboard. Its 3.3V UART serial port receives pre-collected LoRa data packets and forwards them over local Wi-Fi via TCP or HTTP Client protocols, eliminating the need for expensive wired Ethernet drops.
3. Commercial Appliance Low-Power Wireless Telemetry and Remote Maintenance
For commercial refrigeration, smart vending machines, and water purification units, equipment manufacturers need a compact Wi-Fi module to report diagnostic health metrics without redesigning their core control boards. Operating reliably across industrial temperatures (-40 to +85 degrees C), the E103-W08B connects directly to the main controller via UART. Utilizing integrated MQTT protocol support, it periodically sends operating status, temperature telemetry, and fault codes to maintenance servers, minimizing unexpected machine downtime.
FAQ Section
1. What is the difference between the E103-W08 and E103-W08B module variants?
The primary difference between the two models lies in their RF antenna connection interface. The base E103-W08 model features an onboard PCB trace antenna, making it ideal for compact plastic enclosures with straightforward layout requirements. The E103-W08B variant is equipped with a 1st generation IPEX connector, allowing engineers to connect external high-gain rubber duck or whip antennas, which is essential for mounting inside shielded metal equipment cabinets or extending RF coverage in congested 2.4GHz environments.
2. How does the dual ARM Core architecture benefit embedded IoT developers?
The module integrates a dedicated ARM Cortex-M3 Application Processor alongside an ARM Cortex-M Link Controller processor. This dual-core hardware separation enables dedicated hardware processing for the complex Wi-Fi (802.11b) and BLE 5.0 protocol stacks on one core, while the second core reliably manages serial data buffering, AT command parsing, and TCP/MQTT network socket states. This prevents data loss during high-throughput serial transmission and lowers the primary MCU processing overhead.
3. Does the E103-W08B support direct connection to cloud platforms without an external TCP stack?
Yes. The E103-W08B features an embedded network protocol stack that natively supports TCP Client/Server, UDP, HTTP Client, and MQTT protocols. Developers can send simple AT commands via the UART interface to establish secure MQTT connections directly to cloud IoT platforms (such as Alibaba Cloud, AWS IoT, or custom EMQX brokers) without having to implement network protocols or driver stacks on their main host microcontroller.
4. What power supply precautions should be taken when integrating the E103-W08B into an SMD board layout?
The module operates from a nominal 3.3V DC power supply (3.0V to 3.6V maximum). During Wi-Fi transmission bursts at 10dBm output power, peak currents can surge momentarily. Designers must ensure that the power supply trace is sufficiently wide and backed by decoupling capacitors (e.g., 10uF ceramic combined with 100nF) located close to the VCC pins to prevent voltage dips that could trigger unexpected MCU resets.