E32-900T30D is a wireless serial port module (TTL level) , transparent transmission mode, working in the 862~930MHz frequency band, using LoRa spread spectrum technology. At present, it has been stably mass-produced, and has been widely used in the three-meter industry, Internet of Things transformation, smart home and other fields.
| Parameter | Technical Specification |
|---|---|
| Model Number | E32-900T30D-V8 |
| Core Technology | LoRa Spread Spectrum (SX1276) |
| Operating Frequency | 862 ~ 930 MHz (868/915MHz Support) |
| Max Transmit Power | 30 dBm (approx. 1W) |
| Supply Voltage | 3.3V - 5.5V DC (Typ. 5.0V) |
| Communication Level | 3.3V (TTL Level) |
| Package & Size | DIP / 24 * 43 mm |
| Antenna Interface | SMA-K |
Download Manual
Manual
Xcom
RF_Setting
Demo
PCB_E32
Ebyte Company Profile
| Main parameter | Description |
Remark |
| Distance for reference |
8kM |
Test condition：clear and open area, antenna gain: 5dBi，antenna height: 2.5m，air data rate: 2.4kbps |
| TX length |
58Btye |
Maximum capacity of single package, automatic sub-packing after exceeding. |
| Buffer |
512Btye |
- |
| Modulation |
LoRa™ |
- |
| Communication interface |
TTL |
@3.3V |
| Package |
DIP |
- |
| Connector |
DIP |
1*7*2.54mm spacing |
| Size |
24*43 mm |
- |
| Antenna |
SMA-K |
50 ohm impedance |
| Main parameter | Min | Typ. | Max. | nit | Remark |
| Operating voltage |
3.3 |
5 | 5.5 | V | ≥5.5 V ensures output power |
| Communication level |
- | 3.3 |
- | V |
For 5V TTL, it may be at risk of burning down |
| Operating temperature |
-40 |
- | +85 |
℃ |
Industrial design |
| Operating frequency（ |
862 |
- | 931 |
MHz |
Support ISM band |
| Transmitting current |
- | 650 |
- | mA |
Instant power consumption |
| Receiving current |
- | 25 |
- | mA |
- |
| Turn-off current |
- | 5 |
- | μA |
Software is shut down |
| Max Tx power |
- | 30 |
- | dBm |
- |
| Receiving sensitivity |
-145 |
-147 |
-148 |
dBm |
Air data rate is 2.4kbps |
Application
Rural Smart Agriculture Management: Leveraging the 30dBm high-power output, the E32-900T30D-V8 penetrates dense foliage and topographical obstacles in large-scale farms, allowing moisture and soil sensors to transmit data reliably to a central gateway miles away without expensive cellular infrastructure.
Industrial Smart Metering Infrastructure: The Air-Wake up (WOR) technology is ideal for battery-powered water and gas meters. It solves the pain point of high energy consumption by keeping the module in ultra-low power mode until a wireless signal "wakes" it for data transmission, extending battery life significantly in deep-indoor urban environments.
Off-Grid Oil & Gas Pipeline Telemetry: In extreme operating temperatures (-40 to +85°C), the module provides a resilient serial link for remote pressure sensors. Its LoRa spread spectrum technology ensures signal integrity against electromagnetic interference (EMI) commonly found in industrial pumping stations and mining sites.
FAQ
Q: How should the power supply be configured to handle the peak current during a 30dBm transmission?
A: During the 1W (30dBm) transmission phase, the E32-900T30D-V8 requires a high-stability power supply capable of providing at least 600mA of instantaneous current. It is critical to use a low-dropout regulator and place a 100uF low-ESR tantalum capacitor close to the VCC pin to prevent voltage dips that could trigger a chip reset or frequency drift due to the high-power load on the internal power amplifier.
Q: What are the impedance matching considerations for the SMA-K antenna interface on this module?
A: The module is designed with a standard 50-ohm characteristic impedance at the RF output port. To maximize the 30dBm link budget, the connected antenna must have a Voltage Standing Wave Ratio (VSWR) of less than 1.5. Any impedance mismatch will lead to signal reflection back into the power amplifier, which not only reduces the effective communication range but can also lead to excessive heat buildup and permanent damage to the RF frontend in high-power continuous transmission modes.
Q: Does the 3.3V communication level require level shifting when connecting to a 5V microcontroller?
A: While the power supply can accept up to 5.5V, the UART communication pins (TXD/RXD) are standard 3.3V TTL levels. When integrating with a 5V MCU like an industrial PLC or certain Arduino models, it is highly recommended to use a series resistor or a dedicated bidirectional level shifter. Connecting 5V logic directly to the RXD pin for extended periods may cause latch-up or degrade the input buffer of the SX1276 chip due to over-voltage stress.
