E22-400M33S is based on the new generation of LoRaTM RF chip SX1268 produced by Semtech in the United States as the core of independent research and development of the maximum power of 2W and suitable for 433/470MHz SMD LoRaTM wireless module, using industrial-grade high-precision 32MHz crystal oscillator.
| Main Parameter | Specification / Performance | Technical Remarks |
|---|---|---|
| Model Number | E22-400M33S | Industrial-grade SMD LoRa module |
| RF Chip Solution | Semtech SX1268 | New generation LoRa™ spread spectrum core |
| Operating Frequency | 410 ~ 493 MHz | Supports 433MHz / 470MHz ISM bands |
| Maximum Transmit Power | 33 dBm (2W) | Requires supply voltage ≥ 5.0V for full power |
| Communication Range | 16 km | Tested in clear, open area with 5dBi gain antenna |
| Host Communication Interface | SPI | Data rate from 0 to 10 Mbps |
| Operating Voltage Supply | 3.3 ~ 5.5 V DC | 5.0V recommended for maximum RF output efficiency |
| Communication I/O Level | 3.3 V | Risk of burnout if connected directly to 5V TTL |
| Physical Dimensions | 24 * 38.5 mm | SMD package with stamp holes & IPEX connector |
Download Manual
E22-400M33S Manual
PCB
DEMO
E22 Chip
Company Proflile
Application Note
E22-400M33S CE Certification
E22-400M33S ROHS Certification
| Main parameters | Performance | Remarks | |||
| Mini | Typ | Max | |||
| Operating Voltage（V） | 3.3 | 5 | 5.5 | ≥5.0V Guaranteed output power |
|
| Communication level（V） |
- |
3.3 |
- |
Risk of burnout with 5V TTL | |
| Operating temperature（°C） | -40 | - | +85 | Industrial grade design | |
| Operating Frequency Band（MHz) | 410 | 433/470 | 493 | ISM band support | |
| Power consumption |
Emission current（mA） |
- |
650 |
- |
Instantaneous power consumption |
| Receiving current（mA) |
- |
14 |
- |
- |
|
| Dormant current (uA) |
- |
2 |
- |
Software shutdown | |
| Maximum transmitting power（dBm） | 32.5 | 33 | 33.5 |
- |
|
| Reception sensitivity（dBm） | -124 | -125 | -126 | Airspeed 0.3kbps | |
| airspeed（bps） | 0.6k | - | 300k | User-programmed control | |
| 0.018k | - | 62.5k | User-programmed control | ||
| Main parameters | Description | Remarks |
| Reference Distance | 16km | Clear and open, antenna gain 5dBi, antenna height 2.5m, air rate 0.3kbps |
| FIFO | 256Byte | Maximum length of a single transmission |
| Crystal Frequency | 32MHz |
- |
| Modulation mode | LoRa(Recomm end) |
- |
| Packaging method | SMD |
- |
| Interface method | 2.54mm | Stamp Holes |
| Communication Interface | SPI | 0～10Mbps |
| Dimension | 38.5*24mm |
- |
| Antenna interface | Stamp Holes/IPEX | Equivalent impedance about 50Ω |
| Limit parameters | Performance | Remarks | |
| Mini | Max | ||
| Supply Voltage（V） | 0 | 5.5 | Permanent module burnout above 5.5V |
| Blocking power（dBm） | - | 10 | The probability of burning is small when used in close proximity |
| Operating temperature（°C） | -40 | +85 | industrial grade |
Application Scenarios
Remote Oil & Gas Pipeline Telemetry
In sprawling oilfield environments, data transmission encounters massive blockages from heavy metal infrastructure and uneven topography. The E22-400M33S leverages its ultra-high 33dBm (2W) output power and the advanced penetration characteristics of the 433MHz frequency band to break through dense physical obstructions. This ensures continuous, real-time pressure, temperature, and flow data telemetry over a 16km range without needing costly intermediate repeaters.
Smart Agricultural Irrigation Networks
Deploying automated valves and moisture sensors across thousands of hectares requires a wireless solution that prioritizes battery longevity and wide geographic coverage. Operating via an efficient SPI interface and the SX1268 core, this module provides superior receiver sensitivity (-125dBm at 0.3kbps). It bypasses signal attenuation caused by thick crop canopies and foilage, ensuring ultra-reliable long-range control commands reach deep field actuators.
Industrial Automation & Harsh Factory Telemetry
Modern smart factories are dense with electromagnetic interference (EMI) originating from high-power motors, VFDs, and heavy machinery. Standard wireless protocols easily fail under these conditions. The E22-400M33S implements Semtech's signature LoRa spread spectrum modulation, which offers high immunity to phase noise and co-channel interference. Combined with an industrial-grade 32MHz high-precision crystal oscillator, it maintains stable asset tracking and sensor loops across the manufacturing floor.
FAQ
Q: What are the exact voltage requirements to achieve the maximum 33dBm output power on the E22-400M33S?
A: To fully realize the maximum 33dBm transmit power, the module supply voltage must be maintained at 5.0V or higher during transmission, up to the absolute safety limit of 5.5V. Operating the module at a lower voltage like 3.3V will significantly drop the RF output power and reduce the transmission range, as the onboard power amplifier circuit requires the higher voltage rails to reach full amplification efficiency.
Q: Can the SPI logic interface lines be connected directly to a 5V microcontroller like an Arduino Uno?
A: No, the communication level of this module is strictly rated at 3.3V. Connecting the SPI lines directly to a 5V TTL microcontroller poses a severe risk of permanently burning out the SX1268 chip's internal logic gates. Engineers must implement external bidirectional level shifters or resistor divider networks on the MOSI, SCK, MISO, and NSS lines to step down the 5V signals to safe 3.3V thresholds.
Q: How does the peak current consumption during transmission affect the choice of power supply decoupling components?
A: The instantaneous emission current reaches up to 650mA at peak power. To prevent severe voltage dips on the power rail which can cause MCU resets or RF instability, you should place a low-ESR electrolytic capacitor of at least 100uF to 220uF in parallel with a 0.1uF ceramic capacitor as close to the module VCC and GND pins as possible to filter high-frequency noise and buffer sudden transient current spikes.
Q: What are the impedance and layout considerations for the antenna connection via the stamp holes?
A: The antenna interface is designed for an equivalent impedance of 50 ohms. When routing the RF signal trace from the stamp holes to an external antenna connector on a custom PCB, you must design a 50-ohm coplanar waveguide or microstrip line. This requires precise calculation of trace width based on dielectric thickness, keeping the path as short as possible, avoiding 90-degree bends, and ensuring an uninterrupted ground return path beneath the RF trace to minimize insertion losses.
