The Ebyte E48-900T20S is an industrial-grade 855-925MHz 20dBm GFSK TTL wireless data transmission module featuring 3.5km communication range, automatic frequency hopping (FHSS), automatic packet retransmission (ARQ), automatic relay networking, 3.5uA ultra-low power Wake-on-Radio (WoR), LBT, and communication key encryption in a compact SMD stamp-hole footprint for reliable IoT deployment
| Parameter / SKU | E48-900T20S | E48-900T20S + TX915-FPC-8521 | E48-900T20S + TX915-JKS-IPX20 |
|---|---|---|---|
| Bundle Description | Module only | Module + FPC Antenna | Module + External Omnidirectional Antenna |
| Operating Frequency | 855 - 925 MHz (Covers EU868 & US915) | 855 - 925 MHz (Covers EU868 & US915) | 855 - 925 MHz (Covers EU868 & US915) |
| Transmit Power | 20 +/- 1 dBm (Configurable) | 20 +/- 1 dBm (Configurable) | 20 +/- 1 dBm (Configurable) |
| Measured Range | 3.5 km (Clear open field) | 3.5 km (Internal enclosure setup) | 3.5 km (High-gain external setup) |
| Modulation & Protocol | GFSK with Auto Frequency Hopping | GFSK with Auto Frequency Hopping | GFSK with Auto Frequency Hopping |
| Air Rate | 2.4 kbps - 500 kbps (8 levels) | 2.4 kbps - 500 kbps (8 levels) | 2.4 kbps - 500 kbps (8 levels) |
| Supply Voltage (VCC) | 2.7 - 5.5 V DC | 2.7 - 5.5 V DC | 2.7 - 5.5 V DC |
| Communication Level | 3.3 V TTL UART | 3.3 V TTL UART | 3.3 V TTL UART |
| Sleep Current | 3.5 uA | 3.5 uA | 3.5 uA |
| Antenna Connection | IPEX / Stamp Hole Pad | Flexible PCB Antenna included | 20cm IPEX Rubber Antenna included |
| Dimensions & Weight | 26 x 16 mm SMD, 2.0 +/- 0.1 g | 26 x 16 mm SMD, 2.0 +/- 0.1 g | 26 x 16 mm SMD, 2.0 +/- 0.1 g |
Technical Specifications
| Electrical Parameter | Unit | Value | Remarks |
| Operating Voltage | V | 2.7 – 5.5 | >3.3 V recommended for guaranteed output power |
| Communication Level | V | 3.3 | Do NOT use 5 V TTL directly — risk of damage |
| TX Current | mA | 110 | Peak @5 V supply |
| RX Current | mA | 12 | @5 V supply |
| Sleep Current | µA | 3.5 | Software shutdown mode |
| Operating Temperature | ℃ | −40 to +85 | Industrial grade |
| RF Parameter | Unit | Value | Remarks |
| Working Frequency | MHz | 855 – 925 | ISM band; covers EU868 & US915 |
| Transmit Power | dBm | 20 ± 1 | Multi-level adjustable via AT command |
| Blocking Power | dBm | 0 – 10 | Reduces burn risk at close range |
| Receive Sensitivity | dBm | −120 ± 2 | @2.4 kbps air rate |
| Air Rate | kbps | 2.4 – 500 | 8 levels, configurable via AT command |
| Measured Range | km | 3.5 | Open field, 3.5 dBi antenna @ 2.5 m height, 2.4 kbps |
| Physical Parameter | Unit | Value | Remarks |
| Dimensions | mm | 26 × 16 | SMD stamp-hole, 1.27 mm pitch |
| Weight | g | 2.0 ± 0.1 | — |
| Antenna Interface | — | IPEX / Stamp Hole | — |
| Modulation | — | GFSK | — |
| Communication Interface | — | UART TTL | 3.3 V logic level |
| Packet Buffer | Byte | 1000 | — |
| Max Packet Length | Byte | 58 / 116 | Configurable via AT command |
Key Features
Automatic Frequency Hopping
The E48-900T20S implements pseudo-random frequency hopping across the 855–925 MHz band, significantly improving anti-interference performance in congested ISM environments. Ideal for deployments near Wi-Fi, Zigbee, or other 900 MHz devices.
Automatic Packet Retransmission
Built-in ARQ (Automatic Repeat reQuest) ensures reliable delivery without host MCU overhead. The module autonomously retransmits lost packets and confirms receipt, reducing application-layer complexity.
Ultra-Low Power & Air Wake-Up (WoR)
Sleep current of only 3.5 µA enables battery-powered deployments. The hardware air wake-up function allows the module to wake from sleep on receiving a valid RF signal, enabling duty-cycled sensor nodes with years of battery life.
Data Encryption & Communication Key
Supports configurable communication keys for link-layer encryption. Ensures data security in multi-node deployments and prevents unauthorized access or eavesdropping.
Automatic Relay Networking
Supports multi-hop relay networking without additional infrastructure. Nodes can automatically forward packets, extending effective range beyond line-of-sight limitations.
LBT (Listen Before Talk) & RSSI
LBT compliance ensures the module checks channel occupancy before transmitting, reducing collisions in dense networks. Real-time RSSI readback enables link quality monitoring and adaptive power control.
Industrial-Grade Design
Rated −40 ℃ to +85 ℃. Passes industrial EMC and ESD standards. SMD stamp-hole packaging with 1.27 mm pitch ensures reliable reflow soldering and mechanical stability in vibration-prone environments.
Practical Application Scenarios
1、Industrial Wireless Data Acquisition and High-Speed PLC Telemetry
In dense industrial environments flooded with 2.4GHz Wi-Fi and Bluetooth noise, the E48-900T20S operates across the sub-GHz 855-925MHz band. Utilizing high-speed GFSK modulation up to 500kbps combined with automatic frequency hopping (FHSS) and hardware ARQ retransmission, it ensures zero packet loss and minimal latency when connecting distributed PLCs, remote I/O modules, and industrial field buses.
2、Battery-Powered Off-Grid Smart Agriculture Monitoring
For remote soil condition monitoring, weather telemetry, and automated irrigation control across extensive farms, power consumption is critical. The E48-900T20S features an ultra-low 3.5uA sleep current paired with Wake-on-Radio (WoR) functionality. Sensor nodes remain asleep until activated by a radio signal, enabling multi-year deployment on single battery cells over a 3.5km coverage range.
3、Multi-Hop Mesh Networks for Municipal Water and Energy Metering
In urban or complex terrain environments where direct line-of-sight is obstructed, the module's automatic relay networking capability allows intermediate nodes to forward packets seamlessly without host MCU intervention. Combined with LBT (Listen Before Talk) collision avoidance and communication key encryption, it creates scalable, secure wireless mesh networks for smart electricity, gas, and water metering infrastructures.
Ordering Options
| SKU | Contents | Antenna |
| E48-900T20S | Module only | IPEX connector (antenna not included) |
| E48-900T20S + TX915-FPC-8521 | Module + FPC antenna | 915 MHz flexible PCB antenna |
| E48-900T20S + TX915-JKS-IPX20 | Module + external antenna | 915 MHz IPEX omnidirectional antenna, 20 cm cable |
FAQ Section
1、How does the automatic frequency hopping (FHSS) mechanism in the E48-900T20S improve signal reliability in crowded sub-GHz bands?
The E48-900T20S dynamically cycles transmission across multiple carrier frequencies within the 855-925MHz spectrum according to a pseudo-random hopping algorithm. If a specific frequency experiences local interference or fading from co-located wireless equipment, the module automatically shifts to a clear channel, ensuring continuous links without user intervention.
2、What are the power supply and IO voltage level requirements to prevent hardware damage?
While the module's supply voltage (VCC) accepts a flexible DC range of 2.7V to 5.5V (with >3.3V recommended for maximum 20dBm transmit output), the UART communication interface strictly requires 3.3V TTL logic levels. Connecting 5V MCU logic signals directly to the UART pins will risk permanent chip damage, so an external bidirectional logic level shifter must be used with 5V microcontrollers.
3、Can the E48-900T20S be configured remotely without physical access to deployed field nodes?
Yes, the E48-900T20S supports wireless remote configuration commands over the air in addition to local AT commands via UART using Ebyte's Windows RF Setting Tool. Engineers can adjust key parameters such as operating channel, air rate, transmit power, packet length, communication encryption keys, and WoR sleep intervals without physically removing deployed field nodes.
