The Ebyte E78-400M22S1C is an industrial-grade 410-490MHz 21dBm LPWAN LoRa wireless module powered by the ASR6601 SoC chip, supporting LoRaWAN and LinkWAN multi-protocol standards to deliver reliable long-range communication up to 6km with low power consumption and dual IPEX/Stamp hole antenna interfaces for IoT deployments.
| Parameter / SKU | E78-400M22S1C | E78-400M22S1C + TX433-FPC-3208 | E78-400M22S1C + TX433-JKS-IPX20 |
|---|---|---|---|
| Bundle Description | Module only | Module + FPC Antenna | Module + External Rubber Antenna |
| RF SoC Chipset | ASR6601SE (ARM Cortex-M4 + Semtech SX1262 core) | ASR6601SE (ARM Cortex-M4 + Semtech SX1262 core) | ASR6601SE (ARM Cortex-M4 + Semtech SX1262 core) |
| Operating Frequency | 410 - 490 MHz (Covers 433MHz / 470MHz) | 410 - 490 MHz (Covers 433MHz / 470MHz) | 410 - 490 MHz (Covers 433MHz / 470MHz) |
| Protocol Support | LoRaWAN, LinkWAN, Native LoRa | LoRaWAN, LinkWAN, Native LoRa | LoRaWAN, LinkWAN, Native LoRa |
| Transmit Power | 21 dBm (Typ. 20.8 dBm) | 21 dBm (Typ. 20.8 dBm) | 21 dBm (Typ. 20.8 dBm) |
| Receiving Sensitivity | -148 dBm | -148 dBm | -148 dBm |
| Reference Range | 6.0 km (Clear open area) | 6.0 km (Internal enclosure setup) | 6.0 km (External omnidirectional setup) |
| Operating Voltage | 1.7 - 3.7 V DC (Typ. 3.3V) | 1.7 - 3.7 V DC (Typ. 3.3V) | 1.7 - 3.7 V DC (Typ. 3.3V) |
| Sleep Current | 1.8 uA | 1.8 uA | 1.8 uA |
| Antenna Interface | IPEX 1st Gen / Stamp Hole (50 ohm) | FPC Antenna with IPEX connector | 20cm IPEX Rubber Whip Antenna |
| Dimensions & Weight | 26 x 16 x 2.8 mm SMD, 1.9 g | 26 x 16 x 2.8 mm SMD, 1.9 g | 26 x 16 x 2.8 mm SMD, 1.9 g |
| Parameter | Performance | Remark |
|---|---|---|
| Frequency | 410~490 MHz | - |
| TX Power | 21dBm | - |
| Reference distance | 5.5 Km | Lora 1kbps |
| Parameter | Performance | Remark |
|---|---|---|
| Size | 26*16*2.8mm | - |
| Antenna | IPEX/Stamp hole | 50 ohm impedance |
| IC | ASR6601SE | - |
| Package | SMD | - |
| Net Weight | 1.9g | - |
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| TX current | 105 | 108 | 110 | mA |
| RC current | 8.5 | 8.7 | 11 | mA |
| Sleep current | 1.6 | 1.8 | 1.8 | uA |
| TX power | 20.6 | 20.8 | 21 | dBm |
| Receiving sensitivity | - | -148 | - | dBm |
| TCXO crystal | - | 32 | - | MHz |
| TCXO crystal voltage | 1.8 | 1.8 | 3.3 | V |
| Recommended frequency | 410 | 433/470/490 | 490 | MHz |
| Power supply | 1.7 | 3.3 | 3.7 | V |
| Communication level | 1.7 | 3.3 | 3.7 | V |
| Working Temperature | -40 | - | +85 | ℃ |
| Humidity | 10％ | - | 90％ | - |
| Storage Temperature | -40 | - | +125 | ℃ |
Practical Application Scenarios
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Smart City LoRaWAN Water and Gas Metering Networks
In municipal utility infrastructure, battery-powered water meters and gas pressure monitors require reliable multi-year operation under harsh underground or indoor signal attenuation. The E78-400M22S1C leverages the ASR6601 SoC with native LoRaWAN protocol stack support, allowing remote endpoint devices to connect directly to standard LoRaWAN gateways across a 6km coverage radius while operating at an ultra-low 1.8uA sleep current.
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Agricultural Soil and Climate Monitoring Systems
In large-scale smart farming and automated greenhouse monitoring, environmental sensors must collect temperature, humidity, and soil EC values at designated time intervals. The module operates in the 410-490MHz band with an exceptional -148dBm receiving sensitivity, enabling stable long-range telemetry through dense crop canopies back to central agricultural gateways without relying on costly cellular SIM subscriptions.
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Industrial Smart Grid Substation and Equipment Status Tracking
In power distribution networks, monitoring switchgear status, cable temperature, and transformer alerts requires high immunity against electromagnetic interference. The E78-400M22S1C features an integrated 32MHz TCXO crystal to ensure minimal frequency drift under extreme industrial temperature ranges (-40 to +85 degrees Celsius), transmitting critical alarm frames over 433MHz/470MHz back-end networks.
FAQ Section
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What are the primary hardware advantages of using the ASR6601 SoC chip in the E78-400M22S1C compared to traditional MCU plus transceiver module architectures?
The ASR6601 integrates an ARM Cortex-M4 MCU core and a Semtech SX1262 RF transceiver on a single die. This single-chip SoC architecture eliminates external SPI trace layout complexities, reduces overall board footprint to 26x16mm, lowers power consumption down to 1.8uA during sleep, and allows developers to flash custom LoRaWAN user applications directly into internal flash memory without needing an extra host microcontroller.
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How does the dual antenna interface (IPEX and Stamp Hole) affect PCB layout considerations during mass production embedding?
The module offers both a 1st Gen IPEX RF connector and a 50-ohm stamp-hole solder pad. Developers using an external rubber or enclosure-mounted antenna can connect directly via the IPEX socket, while OEM high-volume manufacturing lines can route a 50-ohm microstrip trace directly from the stamp-hole pin to a PCB antenna or SMA connector, simplifying automated SMT placement.
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What operating voltage limits and power decoupling techniques are recommended to ensure full 21dBm RF transmit power?
The E78-400M22S1C operates across a wide supply voltage range from 1.7V to 3.7V, with 3.3V recommended for nominal performance. During peak 21dBm transmit output, the peak current draw reaches up to 110mA. Power traces should be kept wide, and decoupling capacitors (such as 10uF in parallel with 100pF) must be placed close to the VCC pin to prevent voltage dips that could trigger unexpected MCU brown-out resets.
