E44-TTL-100 SX1276 LoRa Transceiver Module 915MHz UART 20dBm

The E44-TTL-100 is a wireless UART transceiver module built around the SX1276 RF chip from Semtech, designed for long-range, low-power data communication in the 915MHz ISM band. The module uses LoRa spread-spectrum modulation, which provides significantly longer transmission distance and greater interference immunity compared with conventional FSK or OOK systems. It operates across a frequency range of 910MHz to 931MHz with a default center frequency of 915MHz, and delivers a configurable RF output power from 10dBm to 20dBm. The module is a complete, ready-to-use transceiver with a UART TTL interface, allowing direct connection to microcontrollers, Arduino boards, and embedded systems without requiring SPI-level configuration or RF layout expertise.

The E44-TTL-100 LoRa module supports transparent transmission, meaning data sent into the UART is transmitted over the air and reproduced on the receiver’s UART output without additional packet handling by the host. The air data rate is adjustable from 0.3kbps to 19.2kbps, giving users a trade-off between range and throughput. The module operates from an input voltage of 2.3V to 5.2V, with a communication level of 2.5V to 3.6V, making it compatible with both 3.3V and 5V logic systems. Transmitting current is 110mA to 130mA, receiving current is 13mA to 15mA, and sleep current is only 3µA to 5µA, supporting battery-powered and energy-sensitive installations.

The module is supplied with an SMA-K antenna connector and measures 50mm × 21mm × 12mm, allowing it to be integrated into remote sensors, telemetry units, and industrial controllers. Its operating temperature range of -40°C to +85°C and humidity tolerance of 10% to 90% make it suitable for demanding environments. Typical applications include home security and alarm systems, smart home sensors, wireless alarm networks, building automation, industrial remote control, healthcare monitoring, and advanced meter reading. The module is a practical choice for engineers and makers who need reliable long-range wireless data links with minimal integration effort.