Introduction: The 900MHz Band
In the global deployment of the Internet of Things, the 900MHz band (862–930MHz) plays a vital role. As a worldwide license-free ISM band (e.g., 868MHz in Europe, 915MHz in North America), it combines strong diffraction capability, excellent penetration, and long transmission distance, making it the preferred band for long-range, low-power IoT technologies such as LoRa and ZigBee.
The LoRa spread-spectrum technology from Semtech (USA) has become the industry standard for 900MHz wireless communication thanks to its ultra-long range, ultra-low power consumption, and strong anti-interference capability. Based on the Semtech LoRa solution, Chengdu EBYTE Electronic Technology Co., Ltd. has launched the classic E32-900T series UART serial modules, providing a complete wireless communication solution from SMD to DIP and from 20dBm to 30dBm.
This article provides an in-depth analysis of E32-900T20S, E32-900T30D, E32-900T20D, and E32-900T30S from the E32-900T series, helping you fully understand their technical features and selection strategy.
Whose Core Needs Does It Solve?
The E32-900T series modules serve four core user groups, precisely addressing their urgent needs:
| User Group | Typical Identity | Core Pain Point | Solution |
|---|---|---|---|
| Long-range IoT system integrators | System integrators, contractors | Need to reliably transmit sensor data (weather, water quality, agricultural environment) from several kilometers away back to a central station; require long range and strong penetration | The E32-900T30S/D (30dBm/8km) provides high-power, ultra-long-range communication to handle complex environments |
| Smart meter reading & energy management solution providers | IoT solution providers, energy companies | Need to centrally collect water, electricity, and gas meter data scattered across communities; require long range, low cost, and long battery life under battery power | The E32-900T20S/D (20dBm/100mW) mature low-power solution, combined with LoRa, meets meter-reading range and battery-life requirements |
| Industrial automation & remote monitoring developers | Hardware engineers, project managers | Need to build a stable, interference-resistant wireless network for monitoring production lines or equipment; require easy integration and stable performance | Classic LoRa technology provides strong anti-interference; the E32-900T series supports transparent transmission for rapid MCU integration in reliable industrial wireless communication |
| Wireless module selection & test engineers | R&D engineers, test personnel | Need to choose between different package forms (SMD/DIP) and power levels (20dBm/30dBm) and quickly evaluate module performance | The series offers S (SMD) and D (DIP) packages plus 20dBm and 30dBm power levels, flexibly adapting to different project needs |
Product Overview: E32-900T Series UART Serial Module Matrix
Core Chip: Semtech LoRa Solution
The E32-900T series modules all use Semtech's classic LoRa spread-spectrum chip (SX1276), which offers the following core advantages:
LoRa™ direct-sequence spread spectrum: greater communication distance, strong anti-interference, and strong confidentiality;
Industrial-grade active temperature-compensated crystal oscillator: ensures stability and consistency;
PA power amplifier and LNA low-noise amplifier: improve communication stability and extend communication range.
Product Portfolio Overview
| Model | Package | Max Power | Key Advantage | Typical Applications |
|---|---|---|---|---|
| E32-900T30S | SMD | 30dBm (1W) | High power, long range, IPEX/stamp-hole antenna | Long-range gateway, industrial data acquisition, outdoor base station |
| E32-900T30D | DIP | 30dBm (1W) | High power, long range, SMA-K antenna | Data radio, long-range communication, industrial PLC |
| E32-900T20S | SMD | 20dBm (100mW) | Compact, low power, high value | Smart meter reading, sensor nodes, wireless alarm |
| E32-900T20D | DIP | 20dBm (100mW) | DIP package, easy debugging, SMA-K antenna | Prototyping, lab testing, portable devices |
Feature Overview & Model Comparison
Core Features (Common to All)
Classic LoRa spread spectrum: Semtech classic LoRa technology for greater communication distance and stronger anti-interference;
Transparent transmission: Supports transparent transmission — no need to care about the underlying protocol, simple to use;
Multiple transmission modes: Supports multiple modes, flexibly adapting to different scenarios;
FEC forward error correction: Supports software FEC forward error correction algorithm to improve communication stability;
Industrial-grade standard: Supports long-term operation at -40～+85℃, adapting to various harsh industrial environments;
UART interface: TTL-level output, compatible with 3.3V I/O.
Model Comparison
| Dimension | E32-900T30S | E32-900T30D | E32-900T20S | E32-900T20D |
|---|---|---|---|---|
| Positioning | High-power SMD mainstay | High-power DIP classic | High-value SMD entry | High-value DIP entry |
| Core chip | Semtech SX1276 | Semtech SX1276 | Semtech SX1276 | Semtech SX1276 |
| Carrier frequency | 862–930MHz | 862–930MHz | 862–930MHz | 862–930MHz |
| Max TX power | 30dBm (1W) | 30dBm (1W) | 20dBm (100mW) | 20dBm (100mW) |
| Ideal range | 8km | 8km | 5km | 5km |
| Supply voltage | 3.3–5.5V (>5V best) | 3.3–5.5V (>5V best) | 2.3–5.5V | 2.3–5.5V |
| Built-in PA/LNA | Yes | Yes | No | No |
| Package | SMD | DIP | SMD | DIP |
| Antenna | IPEX/stamp-hole | SMA-K | IPEX/stamp-hole | SMA-K |
| Dimensions | 40.5×25mm | 43×24mm | 16×26mm | 21×36mm |
| Net weight | 5.8g | 11g | 2.3g | 7.6g |
| Key advantage | High power, SMD, compact, integration-friendly | High power, DIP, SMA antenna, easy debugging | Compact, low power, best value | DIP package, easy prototyping |
Technical Specifications
General Specifications
| Parameter | Value |
|---|---|
| Operating band | 862–930MHz (default 868.125MHz) |
| Modulation | LoRa (next-generation LoRa modulation) |
| Default air data rate | 2.4kbps |
| Air data rate range | 2.4k–19.2kbps (user-programmable) |
| Single-packet TX length | 58 Byte (automatic packetization beyond) |
| Buffer capacity | 512 Byte |
| Interface | 1.27mm stamp-hole (S series) / pin header (D series) |
| Communication interface | UART serial (TTL level) |
| Operating temperature | -40～+85℃ |
| Antenna impedance | ≈50Ω |
Model-Specific Parameters
| Parameter | E32-900T30S | E32-900T30D | E32-900T20S | E32-900T20D |
|---|---|---|---|---|
| Max TX power | 30dBm (1W) | 30dBm (1W) | 20dBm (100mW) | 20dBm (100mW) |
| RX sensitivity | -134dBm (typical) | -134dBm (typical) | -124dBm (typical) | -124dBm (typical) |
| Reference range | 8km | 8km | 5km | 5km |
| Dimensions | 40.5×25mm | 43×24mm | 16×26mm | 21×36mm |
| Net weight | 5.8g | 11g | 2.3g | 7.6g |
Application Scenarios
Long-Range Data Acquisition & Monitoring (E32-900T30S / E32-900T30D)
Scenario: In agriculture, meteorology, and environmental monitoring, sensor data (temperature, humidity, wind speed, water quality) from several kilometers away must be reliably transmitted to a central control room.
Recommended solution: E32-900T30S (SMD, integration-friendly) or E32-900T30D (DIP, SMA antenna, easy debugging).
Technical advantages:
30dBm (1W) high power with an 8km range ensures stable transmission across complex terrain and harsh weather;
Built-in PA+LNA improves communication stability and extends range;
FEC forward error correction improves data transmission reliability.
Smart Meter Reading & AMR (E32-900T20S / E32-900T20D)
Scenario: In smart water, electricity, and gas meter remote-reading projects, meter data scattered across communities must be collected centrally at a gateway with low cost and low power.
Recommended solution: E32-900T20S (SMD, ideal for integration into meters) or E32-900T20D (DIP, ideal for prototyping).
Technical advantages:
20dBm (100mW) transmit power with a 5km range, sufficient to cover most communities;
Ultra-compact size (16×26mm) and low-power design integrate easily into meter heads, extending battery life;
Classic mature LoRa solution with stable mass production and very low cost, ideal for large-scale deployment.
Industrial Automation & PLC Communication (E32-900T30D / E32-900T20D)
Scenario: In factories and workshops, data from PLCs, VFDs, and other equipment must be transmitted wirelessly, requiring strong interference immunity and easy installation.
Recommended solution: E32-900T30D (high power, strong interference immunity) or E32-900T20D (DIP, easy connection).
Technical advantages:
DIP package plugs directly into backplanes for secure mounting and convenient debugging/replacement;
SMA-K antenna interface supports external high-gain antennas to further extend range and interference immunity;
LoRa spread spectrum maintains stable communication in complex electromagnetic environments.
Rapid Prototyping & Testing (E32-900T20D / E32-900T30D)
Scenario: In early development, quickly evaluate module performance or perform simple functional verification with plug-and-play, easy-debugging modules.
Recommended solution: E32-900T20D (low power, low cost) or E32-900T30D (high power, long-range testing).
Technical advantages:
DIP package plugs easily into breadboards or perfboards without soldering;
SMA-K antenna interface enables quick swapping of different-gain antennas to test performance in different scenarios;
Combined with EBYTE's E32-900TBL-01 test board, USB-to-serial conversion and host software enable rapid communication testing.
About EBYTE
Founded in 2012, Chengdu EBYTE Electronic Technology Co., Ltd. is a national high-tech enterprise integrating R&D, production, and sales. Focused on industrial IoT wireless communication, its product lines cover wireless modules, data radios, industrial gateways, network I/O, industrial PCs, antennas, and accessories, committed to providing professional IoT communication solutions to customers worldwide.
EBYTE possesses strong technical R&D and customization capabilities. All products pass CE, FCC, and RoHS international certifications, and the company has established a full-process quality traceability system from component selection to burn-in screening. Choosing EBYTE means choosing a professional, reliable, and efficient wireless communication partner.
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