Product Overview
The 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.
- 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
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) |
Resources
Download Datasheet & User Manual (PDF)Download Schematic & PCB Footprint Library
Download CE / FCC / RoHS Certificates
Bulk Purchase & OEM Inquiry
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.
