MAX3078EASA 3.3V Half-Duplex RS-485/RS-422 Transceiver, 16Mbps
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Prices updated: 13 Oct 2026
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About this product
A 3.3V half-duplex RS-485/RS-422 transceiver with one driver and one receiver, rated for ±15kV ESD protection. It includes fail-safe receiver output, hot-swap protection and an unlimited driver slew rate, supporting data rates up to 16Mbps. It is used to connect microcontrollers to long differential serial buses, such as industrial sensors and Modbus networks.
Specifications
- Supply voltage
- 3.3V
- Standard
- RS-485 / RS-422
- Duplex mode
- Half-duplex
- Max data rate
- 16 Mbps
- ESD protection
- ±15 kV
- Supply current
- 800 µA (unloaded)
- Package
- SO-8
Frequently asked questions
How do I wire the MAX3078EASA to an MCU and the RS-485 bus?
Connect the driver input (DI) and receiver output (RO) to the MCU's UART TX and RX pins. Tie the driver enable (DE) and receiver enable (RE) pins together and drive them from one MCU GPIO to switch between transmit and receive. Connect A and B to the bus differential lines, and confirm the pinout in the datasheet.
Does this 3.3V transceiver work with a 5V microcontroller?
The logic pins are designed for 3.3V operation, so a 5V MCU should use a level shifter or a 3.3V-compatible interface on the logic side. The A and B bus lines are differential and are not level-shifted. Add termination resistors at the ends of long cables to reduce reflections.
