The E32-400M30S is a professional 1W (30dBm) LoRa module based on the SX1278 chip, designed for extreme 10km long-range communication in the 433/470MHz band with an SPI interface for high-speed hardware integration.
| Main Parameter | Specification |
|---|---|
| Model Number | E32-400M30S |
| Chip Solution (IC) | Semtech SX1278 |
| Frequency Range | 410 ~ 493 MHz (Supports 433/470MHz) |
| Transmit Power | 30 dBm (1 Watt) |
| Comm. Distance | 10 km (Ideal conditions) |
| Interface Type | SPI (Hardware access) |
| Supply Voltage | 3.3 V - 5.5 V (Typical 5V) |
| Package & Size | SMD | 24 * 38.5 mm |
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Key Parameter
| parameter | Min | Type | Max | Unit | Remark |
|---|---|---|---|---|---|
| Operating voltage | 3.3 | 5 | 5.5 | V | ≥5.5 V ensures output power |
| Communication level | - | 3.3 | - | V | - |
| Operating temperature | -40 | - | +85 | ℃ | Industrial grade |
| Operating frequency | 410 | - | 493 | MHz | - |
| TX current | - | 650 | - | mA | - |
| RX current | - | 19 | - | mA | - |
| Sleep current | - | 2 | - | μA | - |
| Max TX power | - | 30 | - | dBm | - |
| Receiving sensitivity | -123 | -124 | -125 | dBm | Air data rate is 1.2 kbps |
| Main parameter | Description | Remark |
|---|---|---|
| Reference distance | 10Km | Test condition：clear and open area, antenna gain: 5dBi，antenna height: 2.5m，air data rate: 250 kbps |
| FIFO | 256Byte | Maximum length of single send |
| Crystal Oscillator | 32MHz | Passive crystals |
| Protocol | LoRaTM(recommended) | FSK/GFSK/MSK/GMSK/OOK |
| Package | SMD | Spacing of 2.54 mm |
| Interface | 2.54mm | Sample hole |
| Communication interface | SPI | 0～10Mbps |
| Size | 24*38.5mm | - |
| Antenna | Sample hole / IPEX | 50 ohm impedance |
Application
Smart Grid: Utility Metering: In urban environments where signal shielding is prevalent, the E32-400M30S uses its 30dBm power to penetrate thick concrete walls and manhole covers. It ena bles reliable data collection from underground water or electricity meters to a central gateway over several kilometers.
Forest Fire Prevention: Monitoring: The 10km communication distance allows for the deployment of sensor nodes deep in mountainous regions. The SX1278's high sensitivity ensures that even under dense foliage, early warning signals can be transmitted back to the monitoring station reliably.
Industrial Wireless Control: For large-scale factory automation, this module provides a robust wireless link that avoids the high costs of industrial cabling. The LoRa spread spectrum technology offers superior anti-interference capabilities against electromagnetic noise from heavy machinery.
Remote Agricultural Irrigation: It solves the problem of long-distance control in vast plantations. One gateway can control multiple irrigation valves across a 10km radius, optimizing water usage based on real-time soil moisture data.
FAQ
Q: What are the specific power supply requirements to ensure a full 30dBm output for the E32-400M30S?
A: To achieve the maximum 1W output power, the supply voltage should be maintained at 5.0V or higher, up to 5.5V. Since the peak TX current can reach 650mA, your power supply must have a low-ripple regulator capable of providing at least 1A of transient current. Inadequate current capacity or a voltage drop below 4.5V during transmission will significantly reduce the effective range.
Q: How should I handle the communication level mismatch if my MCU uses 5V logic?
A: Although the module can be powered by 5.5V, the SPI communication level (I/O) is typically 3.3V. If you are using a 5V microcontroller like certain Arduino boards, you must use a logic level shifter or a simple resistor divider on the MOSI, SCK, and NSS lines to prevent damaging the SX1278 chip. The MISO line can usually be connected directly as 3.3V is often recognized as a high logic level by 5V systems.
Q: What is the benefit of the dual antenna interface (IPEX and Stamp Hole) on this module?
A: This design provides maximum flexibility for industrial integration. The IPEX connector allows for a quick and secure connection to an external antenna via a pigtail cable, which is ideal for metal enclosures where the antenna must be mounted outside. The stamp hole interface is better for cost-sensitive high-volume production where the antenna is soldered directly to the carrier PCB to minimize assembly steps.
Q: Can the E32-400M30S communicate with the newer SX1268-based E22 series modules?
A: Yes, it is possible because both modules support the standard LoRa modulation. However, you must ensure that both ends are configured with identical parameters, including center frequency, spreading factor (SF), bandwidth (BW), and coding rate (CR). Note that the E32 series typically uses a specific packet structure, so firmware adjustments on the E22 side may be required to achieve full compatibility.
