Ebyte E32-433T37S is a high-power, long-range LoRa wireless serial port module operating in the 410–441MHz band. With 37dBm (5W) transmit power and -128dBm receive sensitivity, it achieves up to 25km communication range in open line-of-sight conditions. The UART TTL interface enables transparent serial data transmission, making it a drop-in wireless link for MCUs, PLCs, and industrial sensors.
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- Model: E32-433T37S
- Frequency: 410–441MHz (ISM band, 433MHz center)
- Tx Power: 37dBm (5W, typical); range 36–38dBm
- Rx Sensitivity: -128dBm (typical)
- Range: 25km (clear sky, 5dBi antenna @ 2.5m height)
- Interface: UART serial port, TTL 3.3V logic level
- Power Supply: 4.5–15V DC (typical 5V or 12V)
- Package: SMD, 50 × 30.9mm, 2.54mm pitch header
- RF Interface: IPEX / Stamp hole (50Ω)
- Operating Temp: -40℃ to +85℃ (industrial grade)
- Applications: Industrial telemetry, smart agriculture, utility metering, security systems, long-range IoT sensor networks
Technical Specifications
| Parameter | Min | Typical | Max | Remarks | |
|---|---|---|---|---|---|
| Working Voltage (V) | 4.5 | 5–12V | 15 | ≥14.5V guarantees rated output power. >15V may permanently damage the module. Use ≥3.5A supply at 5V; ≥1.5A at 12V. | |
| Communication Logic Level (V) | — | 3.3 | — | TTL 3.3V. Using 5V logic risks burning the module — a level-conversion circuit is required. | |
| Working Temperature (°C) | -40 | — | 85 | Industrial grade design | |
| Frequency Band (MHz) | 410 | — | 441 | Supports ISM frequency band | |
| Power Consumption | TX Current @ 5V (mA) | 2900 | 3100 | 3300 | Tested at 50Ω load. Impedance mismatch may increase current. Use ≥3.5A supply. |
| TX Current @ 12V (mA) | 900 | 1100 | 1300 | Tested at 50Ω load. Use ≥1.5A supply at 12V. | |
| RX Current @ 12V (mA) | 38 | 43 | 48 | Supply voltage: 12V DC | |
| Sleep Current (μA) | — | 2 | — | Software shutdown mode | |
| Max Transmit Power (dBm) | 36 | 37 | 38 | 5W output (37dBm typical) | |
| Receive Sensitivity (dBm) | -130 | -128 | -126 | LoRa modulation | |
| Air Data Rate (bps) | — | User programmable control | |||
| Reference Distance | 25km | Clear sky, 5dBi antenna, 2.5m height | |||
| Max Packet Length | 58 Bytes | Larger data auto-split into packets | |||
| Buffer / Cache | 512 Bytes | — | |||
| Modulation | LoRa | New-generation LoRa spread spectrum | |||
| Communication Interface | UART | TTL 3.3V serial port | |||
| Encapsulation | SMD | Surface mount | |||
| Pin Pitch | 2.54mm | Standard 0.1" header | |||
| Dimensions | 50 × 30.9mm | — | |||
| RF Interface | IPEX / Stamp hole | 50Ω characteristic impedance | |||
| Blocking Power (dBm) | — | — | 10 | Do not use high-power modules at close range | |
| Certifications | CE, FCC, RoHS | — | |||
| Updated | March 2026 | — | |||
Product Details
Classic High-Power LoRa Data Transmission Module
The E32-433T37S is built on Semtech's LoRa spread spectrum technology — the industry standard for long-range, low-power wireless IoT. At 37dBm (5W), it is one of the highest-power LoRa modules in Ebyte's lineup, designed to break through obstacles and extend range in challenging RF environments.
LoRa Spread Spectrum Technology — Strong Anti-Interference
LoRa (Long Range) spread spectrum modulation provides exceptional resistance to interference and multipath fading. The E32-433T37S achieves -128dBm receive sensitivity, enabling reliable links even in electrically noisy industrial environments such as factory floors, substations, and outdoor utility sites.
4 Working Modes
The E32-433T37S supports four configurable operating modes via M0/M1 control pins:
| Mode | M1 | M0 | Description |
|---|---|---|---|
| Mode 0 — Normal | 0 | 0 | Transparent UART transmission; full TX/RX operation |
| Mode 1 — Wake-up | 0 | 1 | Adds preamble to wake sleeping receivers (WoR transmitter) |
| Mode 2 — Power Saving | 1 | 0 | Receiver periodically wakes to check for preamble (WoR receiver) |
| Mode 3 — Sleep / Config | 1 | 1 | Deep sleep; AT command configuration via UART |
Multiple Transmission Methods
Supports transparent transmission (point-to-point), fixed-point transmission (addressed delivery to specific node), and broadcast transmission (one-to-many). Configurable via AT commands without hardware changes.
Deep Sleep, Air Wake-Up (WoR), FEC & Watchdog
Key power and reliability features:
- Deep Sleep: 2μA sleep current (software shutdown) — extends battery life in remote sensor nodes
- Air Wake-Up (WoR): Receiver wakes automatically on detecting a preamble — no polling required
- Forward Error Correction (FEC): Hardware FEC improves packet reliability in noisy channels
- Watchdog: Automatic module reset on firmware hang — improves field reliability
Low Power Consumption with Over-the-Air Wake-Up
In WoR (Wake-on-Radio) mode, the receiver sleeps at 2μA and wakes only when a valid preamble is detected. This enables multi-year battery operation for remote sensor nodes while maintaining responsive communication.
37dBm High Power — Breaks Through Obstacles
At 5W output, the E32-433T37S penetrates walls, vegetation, and urban clutter that would block lower-power modules. Achieves 25km in open terrain; suitable for suburban and rural deployments requiring multi-kilometer links without repeaters.
Overvoltage Warning & Over-Temperature Protection
Built-in hardware protection features:
- Overvoltage Warning: LED/status indication when supply voltage exceeds safe range (>15V permanently damages the module)
- Over-Temperature Protection: Automatic power reduction or shutdown when junction temperature exceeds threshold — prevents thermal damage during continuous high-power TX
Ebyte Quality — High Stability, Strong Supply Capacity
Ideal Applications
1. Long-Range Remote Agricultural Irrigation Control
In vast agricultural fields, the E32-433T37S allows central irrigation controllers to transmit commands to remote solenoid valves and water pumps located kilometers away. Its high output power ensures stable signal penetration through tall crops and over uneven terrain, eliminating the need for expensive, high-maintenance long-distance cabling.
2. Large-Scale Pipeline Monitoring
For oil and gas or water distribution pipelines spanning rural areas, this module acts as a critical communication bridge between remote pressure/flow sensors and a central monitoring SCADA system. By deploying these modules, engineering teams can retrieve real-time diagnostic data from sites where traditional cellular or Wi-Fi coverage is unavailable or unreliable.
3. Industrial Crane and Heavy Machinery Remote Control
The module provides a low-latency, high-reliability wireless link for industrial remote controls used in construction and mining. Its high-power transmission maintains a solid connection in environments filled with steel structures and electromagnetic interference, ensuring that operators retain precise, instantaneous control over heavy equipment from a safe distance.
Variant Options
| SKU | Description |
|---|---|
| E32-433T37S | Module only (no antenna) |
| E32-433T37S + TX433-FPC-3208 | Module + FPC flexible antenna (32cm, 8dBi) |
| E32-433T37S + TX433-JKS-IPX20 | Module + IPEX omnidirectional antenna (20cm) |
| SW433-TH32DN | Accessory: 433MHz dipole antenna (standalone) |
| TX433-TH-3 | Accessory: 433MHz whip antenna (standalone) |
FAQ
Q: What is the maximum communication range of the E32-433T37S?
A: 25km in open line-of-sight conditions, tested with a 5dBi antenna at 2.5m height. In urban or obstructed environments, expect 1–5km depending on obstacles and antenna placement.
Q: What voltage should I use to power the E32-433T37S?
A: The module accepts 4.5–15V DC. For 5V operation, use a power supply with ≥3.5A output capacity due to the high TX current (2900–3300mA). For 12V operation, ≥1.5A is required. Never exceed 15V — this will permanently damage the module.
Q: Can I connect the E32-433T37S directly to a 5V MCU (Arduino, ESP32, STM32)?
A: The UART logic level is 3.3V TTL. Connecting a 5V logic signal directly risks burning the module. Use a level-conversion circuit (e.g., TXS0108E or resistor divider) between the MCU and the module's RX pin.
Q: Is the E32-433T37S compatible with LoRaWAN networks (TTN, Helium)?
A: No. The E32-433T37S uses Semtech LoRa modulation in a proprietary point-to-point / broadcast protocol — it is not LoRaWAN compliant. For LoRaWAN, consider Ebyte's E77 series (STM32WLE5 with LoRaWAN stack).
Q: How do I configure the module (frequency, power, air rate)?
A: Enter Mode 3 (M0=1, M1=1) and send AT commands via UART. Ebyte provides a free PC configuration tool (RF Setting) for Windows. Parameters include: channel (frequency), UART baud rate, air data rate, TX power, and transmission mode.
Q: What is Wake-on-Radio (WoR) and how does it work on the E32-433T37S?
A: WoR allows the receiver to sleep at 2μA and wake automatically when it detects a valid preamble from a transmitter in Mode 1. The transmitter sends an extended preamble before the data packet. This enables battery-powered sensor nodes to achieve multi-year operation while remaining responsive.
Q: Can the E32-433T37S be used at close range (e.g., <10 meters)?
A: Not recommended without attenuation. The maximum blocking power is +10dBm — at close range, the received signal from a 37dBm transmitter will far exceed this, potentially damaging the receiver front-end. Use an RF attenuator or reduce TX power for short-range testing.
