The EBYTE E33-433T13D is an ultra-low-power 433MHz wireless UART transceiver module featuring the SX1212 RF chip and embedded MCU, delivering a 1000-meter range with 12dBm (20mW) transmit power, an exceptionally low 3.0mA receive current, and advanced single-point wireless wake-up capabilities designed for battery-sensitive IoT sensor nodes.
| Parameter Category | E33-433T13D Specifications |
|---|---|
| Core RF Chip | Semtech SX1212 |
| Working Frequency | 425 to 440.5 MHz (Default 433MHz) |
| Transmitting Power | Maximum 12dBm (approx. 20mW) |
| Receiving Current | 3.0 mA (Ultra-low power) |
| Test Distance | 1000 meters (Clear open air) |
| Communication Interface | UART (Serial Port) |
| Power Supply | 2.3 to 5.2 V DC |
| Antenna Type | SMA-K |
| Package Type | DIP / SMD |
| Dimensions & Weight | 21 * 36 mm | 6.6g |
| Special Feature | Target-specific Single Point Wireless Wake-up |
| RF Parameter | Value |
Remark |
| Working frequency |
425 - 440.5 MHz |
Default: 433.0MHz, channel:32 |
| Transmitting power | Maximum 12dBm |
Eight optional level(12, 9, 6, 3, 0, -3, -6, -9dBm) |
| Receiving sensitivity | -110dBm@2kbps |
Sensitivity has nothing to do with serial baud rate or timing |
| Air data rate | 2kbps~15kbps |
Four optional level (2, 5, 10, 15kbps) |
| Test distance | 1000 meter |
Test condition ： clear and open area& 12dBm, antenna gain: 5dBi， height:> 2m，air data rate: 2kbps |
| Hardware Parameter | Value |
Remark |
| Size |
21 * 36 mm |
Without SMA |
| Antenna type | SMA-K |
50 Ω characteristic impedance, selected from 0R resistor |
| Communication interface | UART |
8N1, 8E1, 8O1， Eight kinds of UART baud rate, from 1200 to 115200 bps |
| Package | DIP |
- |
| Buffer | 512 bytes buffer |
58 bytes per package |
| Electronic parameter | Min. | Typ. | Max. | Unit | Condition |
| Power supply |
2.3 | 5.0 | 5.2 | V | - |
| Communication level | - | - | 5.2 | V | - |
| Transmitting current |
- |
55mA |
- | mA | ≥150mA (recommended) |
| Receiving current | - | 3.0 | - | mA |
Mode 0 or Mode 1 |
| Sleep current | - | 2.0 | - | μA | - |
| Operating temperature |
-40 | - | +85 | ℃ | - |
| Operating humidity |
10 | - | 90 | % | - |
| Storage temperature |
-40 | - | +125 | ℃ | - |
Practical Application Scenarios
1. Wireless Smart Metering (Water & Gas Meters) Since water and gas meters are strictly battery-powered and difficult to maintain, the ultra-low sleep current (2.0μA) and 3.0mA receiving current of this module significantly extend battery life. The built-in wireless wake-up feature allows data collection systems to "wake" the meter only when necessary, saving massive amounts of power.
2. Smart Home & Security Sensors Ideal for battery-operated smart door locks, window magnetic sensors, and PIR motion detectors. The module can remain in a deep sleep mode to conserve energy and instantly wake up to transmit an alert via UART when a security event or movement is triggered.
3. Agricultural IoT Sensor Nodes In greenhouses or smart farms, this module can be easily integrated with microcontrollers (like Arduino or STM32) for soil moisture and temperature sensors. With a 1000-meter range, it easily transmits environmental data to a central gateway while running for months on small solar panels or coin batteries.
4. Remote Environmental Monitoring Suitable for remote weather stations and air quality monitors deployed in the wild. Sensors can interface with the module via standard UART to periodically send telemetry data back to a base station, entering ultra-low power mode between transmissions to ensure long-term operation.
5. Active RFID and Asset Tracking Used in smart logistics and warehousing to track high-value assets. The low-power wake-up feature allows the asset tag to be "pinged" by a handheld reader or gateway to report its location and status without constantly draining its internal power supply.
FAQ Section
1. What communication interface does this wireless module use?
The E33-433T13D uses a standard UART (Serial Port) interface. It supports 8 kinds of UART baud rates ranging from 1200 to 115200 bps (8N1, 8E1, 8O1), making it extremely easy to connect to standard microcontrollers (MCUs) or USB-to-TTL converters.
2. Is this module suitable for battery-powered IoT applications? Yes, it is highly optimized for ultra-low power applications. It features an exceptionally low receiving current of just 3.0mA and a sleep current of 2.0μA. Furthermore, it supports target-specific single-point wireless wake-up, making it ideal for battery-sensitive IoT sensor nodes.
3. What is the maximum transmission range, and how can it be achieved? Under ideal conditions (clear open air, 12dBm transmitting power, 5dBi antenna gain, antenna placed >2m above ground, and 2kbps air data rate), the tested transmission distance can reach up to 1000 meters (1km).
4. Do I need to program the SX1212 RF chip directly using SPI? No, you do not need complex RF programming. The module features an embedded MCU that handles the SX1212 chip's underlying driving logic. You can easily configure and transmit data using simple UART serial commands.
5. What type of antenna is required for this module? The module is equipped with a standard SMA-K interface (50Ω characteristic impedance). You can use any standard 433MHz antenna with an SMA connector. For convenience, we also offer a bundle variant (E33-433T13D+TX433-JKD-20P) that includes a compatible antenna.
