E310-900T23S is a wireless serial module based on ON Semiconductor’s AX5045 narrow-band Sub-GHz RF transceiver. Operating at 900–931MHz (default 915MHz), it supports half-duplex transparent UART transmission, air wake-up (WoR, ultra-low power), relay mode for range extension, and configurable packet sizes (32/64/128/190 bytes). Designed for industrial-grade deployments at -40 to +85℃.
Technical Specifications
General & Hardware Parameters
| Parameters | Description | Remark |
|---|---|---|
| IC | AX5045 | ON Semiconductor Sub-GHz narrow-band transceiver |
| Modulation | GFSK | — |
| Communication Interface | UART serial port | TTL 3.3V level, 1.27mm pitch |
| Packaging | SMD | — |
| Dimensions | 16 × 26mm | — |
| Antenna Interface | IPEX / Stamp Hole | ~50Ω impedance |
| Packet Size | 32 / 64 / 128 / 190 Bytes | Configurable via AT command |
| Buffer / Cache | 240 Bytes | — |
| Reference Distance | 5.6km | Open field, 5dBi antenna, 2.5m height, 1.2kbps |
RF & Electrical Parameters
| Parameters | Min. | Typ. | Max. | Remark |
|---|---|---|---|---|
| Working Voltage (V) | 2.3 | 5.0 | 5.5 | ≥3.3V required to guarantee rated output power |
| IO Level (V) | — | 3.3 | — | Add level shifter for 5V TTL systems |
| Working Frequency (MHz) | 900.0 | 915.0 | 931.0 | US915 ISM band |
| Transmit Power (dBm) | 21.5 | 23.0 | 23.5 | — |
| Receive Sensitivity (dBm) | -115 | -119 | -120 | @ 1.2kbps air rate |
| Air Rate (bps) | 1.2k | 1.2k | 125k | User-programmable |
| TX Current (mA) | — | 240 | — | Peak during transmission |
| RX Current (mA) | — | 13 | — | — |
| Sleep Current (μA) | — | 2 | — | Software shutdown (WoR mode) |
| Operating Temp (℃) | -40 | — | +85 | Industrial grade |
Product Details
AX5045 Sub-GHz Narrow-Band RF — 23dBm, -119dBm Sensitivity, 5.6km
Built on ON Semiconductor’s AX5045, the E310-900T23S achieves 23dBm transmit power and -119dBm receive sensitivity at 1.2kbps — delivering a link budget of 142dB and 5.6km range in open field conditions. The narrow-band GFSK modulation provides superior co-channel rejection and spectral efficiency compared to wideband solutions, making it well-suited for dense IoT deployments in the US915 ISM band.
Half-Duplex Transparent UART — Plug-and-Play Serial Wireless Link
The E310-900T23S operates as a transparent UART serial port replacement — data sent to the TX pin is wirelessly transmitted and appears on the RX pin of the paired module, with no protocol stack or RF driver required on the host MCU. Supports baud rates from 1200 to 115200bps and configurable packet sizes (32/64/128/190 bytes) for latency vs. throughput optimization.
Air Wake-Up (WoR) — 2μA Sleep for Battery-Powered Nodes
WoR (Wake-on-Radio) mode reduces sleep current to 2μA, enabling multi-year battery life on AA or lithium primary cells. The receiver periodically wakes to scan for a preamble signal; when detected, it fully activates and receives the packet. This makes the E310-900T23S ideal for low-duty-cycle sensor nodes that transmit infrequently but must remain responsive.
Relay Mode — Range Extension Without Infrastructure
Built-in relay mode allows one or more E310-900T23S modules to act as transparent repeaters, extending effective communication range beyond the 5.6km direct link without additional gateways or network infrastructure. Relay nodes can be battery-powered using WoR mode, enabling flexible deployment in remote or difficult-to-wire locations.
Ideal Applications
FAQ
Q: Is the E310-900T23S compatible with LoRaWAN networks?
A: No. The E310-900T23S uses ON Semiconductor AX5045 with GFSK modulation — it is not a LoRa (Semtech SX12xx) module and does not support LoRaWAN protocol. It operates as a transparent UART serial link with Ebyte’s proprietary addressing and WoR protocol. For LoRaWAN US915, consider Ebyte E22-900T22S or E77-900M22S.
Q: Can the E310-900T23S be powered from 5V?
A: Yes. The module supports 2.3–5.5V power supply, with ≥3.3V required to guarantee rated 23dBm output power. However, the UART IO level is 3.3V TTL — add a level shifter when connecting to 5V TTL microcontrollers to avoid IO damage.
Q: What is the maximum packet size and how does it affect latency?
A: Maximum packet size is 190 bytes (configurable to 32/64/128/190 via AT command). Smaller packets reduce over-the-air latency but increase protocol overhead per byte. For low-latency control applications, use 32-byte packets at higher air rates; for throughput-optimized sensor data, use 190-byte packets at 1.2kbps.
Q: How does relay mode work and how many relay hops are supported?
A: In relay mode, a designated E310-900T23S module automatically re-transmits received packets, extending range transparently. The number of supported relay hops depends on the network configuration and timing settings. Relay nodes can operate in WoR mode to minimize power consumption while maintaining relay functionality.
Q: What antenna options are available?
A: The module supports IPEX (U.FL) connector and stamp-hole pads (50Ω). Available bundle options: module only (E310-900T23S), module + FPC flexible antenna (TX915-FPC-8521), and module + IPEX rubber duck antenna (TX915-JKS-IPX20).
