Product Overview
The EBYTE E330 Series (E330-400T13S / E330-900T13S) are compact, ultra-low-power UART wireless serial port modules using FSK modulation. The 400-series covers 410–493 MHz (433/470 MHz), while the 900-series covers 860–932 MHz (868/915 MHz). Both deliver 13 dBm TX power, up to 2.5 km open-field range, and a sleep current of just 2 μA. Featuring transparent and fixed-point transmission, LDC Wake-on-Radio (WoR), and a stamp hole SMD form factor (16 × 26 mm), the E330 is ideal for drop-in wireless serial replacement in industrial and IoT applications.
Technical Specifications
| Parameter | E330-400T13S | E330-900T13S | Remark |
| Frequency Range | 410.125 – 493.125 MHz | 860.125 – 932.125 MHz | Channel spacing 1 MHz |
| Modulation | FSK | — | |
| Max TX Power | 13 dBm (typ.) / 14 dBm (max) | TX current 35 mA @ 915 MHz / 13 dBm | |
| RX Sensitivity | -118 dBm | @ 2 kbps air rate | |
| Communication Range | Up to 2.5 km | LOS, 3.5 dBi antenna @ 1.3 m; 1.0 km @ 2 kbps reference | |
| Air Data Rate | 2 – 25 kbps | Multi-level adjustable | |
| Interface | UART (8N1 / 8E1 / 8O1) | Baud rate 1200 – 38400 bps | |
| Single Packet Length | 58 bytes | Max per air transmission | |
| Buffer | 80 bytes | Software buffer | |
| Operating Voltage | 3.0 – 5.5 V (typ. 3.3 / 5 V) | >5.5 V may damage module | |
| RX Current | 6.5 mA (typ.) | Normal receive mode | |
| WOR Current | 7 μA (typ.) | LDC interval 1000 ms | |
| Sleep Current | 2 μA (typ.) | Software shutdown | |
| Antenna Interface | IPEX / Stamp Hole | ~50 Ω impedance | |
| Dimensions | 16 × 26 mm | Weight: 1.9 ± 0.5 g | |
| Encapsulation | SMD Stamp Hole | 1.27 mm pitch | |
| Operating Temperature | -40 ℃ to +85 ℃ | Industrial grade | |
| Origin | Chengdu, China | EBYTE / Cdebyte | |
Key Features
Transparent & Fixed-Point UART Transmission
The E330 supports both transparent transmission (serial pass-through, no configuration required) and fixed-point transmission (addressed delivery to specific nodes). UART parameters (baud rate, parity, stop bits) are software-configurable from 1200 to 38400 bps, making it a true drop-in wireless serial cable replacement.
LDC Wake-on-Radio (WoR) — 7 μA Standby
The hardware LDC (Low Duty Cycle) WoR mode reduces standby current to 7 μA (1000 ms interval), with full software shutdown at 2 μA. This enables multi-year battery operation for remote sensors and end nodes without sacrificing responsiveness.
Compact Stamp Hole SMD — Easy PCB Integration
At 16 × 26 mm and only 1.9 g, the castellated stamp hole design enables reliable reflow soldering onto host PCBs. The 1.27 mm pitch and dual antenna options (IPEX connector or stamp hole pad) provide flexible RF layout choices for space-constrained designs.
Ideal Applications
Industrial Automation: Remote I/O, PLC wireless extension, converter & sensor telemetry over 433/868/915 MHz.
Smart Metering: Water, gas, and electricity meter data collection; AMR/AMI sub-GHz mesh networks.
Smart Agriculture: Soil moisture, weather station nodes, irrigation valve control over long-range FSK links.
Building Automation: HVAC control, access control, lighting management via wireless serial bus.
Logistics & Asset Tracking: Container status, warehouse inventory, fleet telemetry with low-power end nodes.
Frequently Asked Questions
Q: What is the difference between E330-400T13S and E330-900T13S?
A: The E330-400T13S operates on 410–493 MHz (433/470 MHz bands, common in Asia and Europe for ISM use), while the E330-900T13S covers 860–932 MHz (868 MHz EU / 915 MHz US). Both share identical electrical specs (13 dBm, FSK, UART, 16×26 mm). Choose based on your regional frequency allocation and regulatory requirements.
Q: How does the E330 compare to LoRa modules like the E22 series?
A: The E330 uses FSK modulation with air rates up to 25 kbps — higher throughput than LoRa at equivalent power, but shorter range (2.5 km vs. 5–10 km for LoRa). E330 is ideal for applications needing higher data rates or lower latency (e.g., serial device bridging, real-time sensor polling), while LoRa (E22/E220) suits ultra-long-range, low-data-rate IoT deployments.
Q: Does the E330 support Wake-on-Radio and what is the actual sleep current?
A: Yes. The E330 supports LDC (Low Duty Cycle) WoR with a standby current of 7 μA at 1000 ms listen interval. Full software shutdown reduces current to 2 μA. This makes the E330 suitable for battery-powered end nodes with multi-year operational life.
Q: What voltage levels are safe, and can I connect it to a 5V MCU directly?
A: The E330 accepts 3.0 – 5.5 V supply voltage and supports both 3.3 V and 5 V UART logic levels. You can connect it directly to a 5 V MCU UART without a level shifter, but do not exceed 5.5 V on VCC — doing so may permanently damage the module.
Q: How do I configure the E330 module for my application?
A: The E330 is configured via AT commands over UART using EBYTE's PC configuration tool (available on cdebyte.com). Parameters include frequency channel, air rate, UART baud rate, TX power, transmission mode (transparent / fixed-point), and WoR interval. No external programmer is required — a USB-to-UART adapter is sufficient.
