The Ebyte E30-433T20S3 is an industrial-grade 433MHz Sub-GHz UART wireless RF transceiver module powered by Silicon Labs' SI4438 high-performance IC, featuring 20dBm maximum transmitting power, -114dBm receiving sensitivity, Wake-on-Radio (WOR) low-power execution, and up to 2.5km long-range transparent data transmission in compact SMD package for IoT telemetry and industrial automation networks.
| Specification Parameter | Technical Value | Remark / Condition |
|---|---|---|
| Main IC | Silicon Labs SI4438 | Sub-GHz Wireless Transceiver |
| Operating Frequency | 425 - 450.5 MHz | Support 433MHz ISM Band |
| Transmitting Power | 10 - 20 dBm | Default 20dBm (Approx. 100mW) |
| Receiving Sensitivity | -114 dBm | At Air Data Rate 1k bps |
| Air Data Rate | 1k - 25k bps | Default 1k bps |
| Communication Distance | 2500 meters (2.5 km) | Clear LOS, max power, 5dBi antenna, height 2m |
| Communication Interface | UART (TTL Level) | Baud rate: 1200 - 115200 (Default: 9600) |
| Supply Voltage | 2.3 - 5.0 V DC | Typical 5.0V; I/O level typical 3.3V |
| Operating Current | TX: 89 mA / RX: 16 mA / Sleep: 4 uA | WOR power-saving mode support |
| Package & Size | SMD, 16 x 26 mm | Weight 2.0 g (+/-0.1g) |
Product Selection Guide
Note: Ensure antenna impedance matching (50 ohm) and frequency compatibility when selecting options.
| Option / SKU | Included Hardware | Antenna Interface / Type | Price (USD) | Recommended Application Scenario |
|---|---|---|---|---|
| E30-433T20S3 | Bare Module Only | IPEX / External PCB Pad | $4.36 | Custom PCB design, OEM mass production with internal antennas. |
| E30-433T20S3 + TX433-FPC-3208 | Module + FPC Flexible Antenna | FPC Antenna (IPEX Connector) | $4.49 | Compact plastic enclosures with curved spaces (e.g., handheld devices). |
| E30-433T20S3 + TX433-JKS-IPX20 | Module + Rubber Rod Antenna | Omnidirectional Rubber Antenna | $5.69 | Industrial cabinets requiring external high-reliability RF links. |
| SW433-TH32DN | Spring Antenna Component | Copper Spring (Soldered) | $0.20 | Ultra-low-cost, space-constrained direct PCB soldering. |
| TX433-TH-3 | Helical Spring Antenna | Helical Wire (Soldered) | $0.20 | Budget-friendly embedded wireless sensor node manufacturing. |
| RF Parameter | Value | Remark |
|---|---|---|
| Working frequency | 425~450.5 MHz | Support ISM band |
| Transmitting power | 10~20 dBm | Default: 20dBm（About 100mW） |
| Receiving sensitivity | -114 dBm | Air data rate: 1k bps |
| Air data rate | 1k~25k bps | Default: 1k bps |
| Test distance | 2500m | In open and clear air, with maximum power, 5 dBi antenna gain, height of 2m, air data rate: 1k bps |
| Hardware Parameter | Value | Remark |
|---|---|---|
| Size | 16 * 26 mm | - |
| Antenna type | IPEX/External | - |
| Communication interface | UART | Baud rate: 1200~115200, default: 9600 |
| Package | SMD | - |
| Buffer | 512 bytes buffer | Automatically sub-packaging with 58 bytes per package |
| Electronic parameter | Min. | Typ. | Max. | Unit | Condition |
|---|---|---|---|---|---|
| Power supply | 2.3 | 5.0 | 5.0 | V | - |
| Communication level | - | 3.3 | - | V | - |
| Transmitting current | - | 89 | - | mA | 20dBm（100mW） |
| Receiving current | - | 16 | - | mA | - |
| Sleep current | - | 4 | - | μA | - |
| Operating temperature | -40 | 20 | +85 | ℃ | - |
| Operating humidity | 10 | 60 | 90 | % | - |
| Storage temperature | -40 | 20 | +125 | ℃ | - |
Key Features & Advantages
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Silicon Labs SI4438 Core Performance: Powered by Silicon Labs' high-sensitivity Sub-GHz transceiver IC, delivering stable anti-interference performance across the 433MHz ISM band with a receiving sensitivity down to -114 dBm.
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UART Transparent Transmission & Auto-Subpackaging: Integrated MCU handles complex RF protocols, providing a simple plug-and-play TTL UART interface with automatic 58-byte frame subpackaging and 512-byte hardware buffer.
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Ultra-Low Wake-On-Radio (WOR) Consumption: Features hardware WOR modes enabling sub-microamp level duty-cycling to significantly reduce system power consumption, drawing as low as 4 uA in sleep mode.
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Compact SMD Stamp Hole Packaging: Engineered with a small 16 x 26 mm Surface Mount Device footprint, optimized for automated SMT assembly line integration in space-restricted embedded systems.
Industrial Installation & Wiring
The module utilizes standard 1.27mm / 2.54mm pitch SMD stamp holes, allowing direct reflow soldering onto customer motherboard PCBs. Ensure the 3.3V TTL UART interface pins (TXD, RXD) match the microcontroller logic level, and connect external supply power between 2.3V and 5.0V DC to the VCC/GND pins. Keep the area directly beneath the IPEX/antenna pad free from copper fills to prevent RF attenuation.
Practical Application Scenarios
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Smart Agricultural Irrigation System Telemetry: Integrated with remote PLC controllers or Soil Moisture Sensor nodes, the module transmits analog readings back to a central gateway across expansive 2.5 km farmland fields without relying on expensive cellular data networks.
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Automated Utility Meter Reading (AMR/AMI): Built into smart gas, water, and electricity meters, the module utilizes WOR low-power modes to sleep continuously and wake periodically for data transmission, ensuring battery operation over multi-year operational lifetimes.
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Industrial Site Environmental & PLC Wireless Monitoring: Connected via TTL UART to industrial MODBUS RTU sensor hubs and remote IO blocks, providing robust half-duplex wireless telemetry in harsh factory environments with electromagnetic interference.
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Smart Building Security & Access Control System: Serves as the wireless link between battery-operated door sensors, alarm sirens, and central security panels within multi-floor buildings using sub-GHz penetration capabilities.
FAQ Section
1. What is the maximum transparent frame size supported by the hardware buffer?
The module features a built-in 512-byte hardware buffer. When user data is sent via UART, the module automatically handles packet fragmentation into 58-byte sub-packages for transmission over the air, ensuring zero data loss during high-volume transfers.
2. Can I connect the UART interface directly to a 5V MCU like an Arduino UNO?
The module operates with a typical 3.3V TTL communication logic level. While VCC can accept up to 5.0V power input, it is recommended to use level shifters or series resistors on TXD/RXD lines when interfacing directly with 5V microcontrollers to maintain signal integrity.
3. How does Wake-on-Radio (WOR) mode help reduce system power consumption?
In WOR mode, the receiving module stays in a deep sleep state (drawing as low as 4 uA) and wakes up periodically to scan for preamble signals. The transmitter sends a extended preamble to wake up the receiver, allowing long battery runtime for field deployments.
4. What is the difference between IPEX connector and PCB antenna pad on this module?
The module provides both options. The IPEX connector allows instant connection to external coaxial cables and rubber rod antennas, while the solder pad is designed for direct soldering of low-cost spring antennas on compact embedded PCBs.
