What this transceiver is and where it fits
The Maxim Integrated MAX3491ESD+ is a full-duplex RS-485/RS-422 transceiver in a 14-SOIC package, handling one driver and one receiver. It operates from a 3 V to 3.6 V supply and delivers a 10 Mbps data rate, making it a fit for high-speed industrial communication links such as PLC-to-sensor networks, motor drive interfaces, and building automation backplanes where the bus runs at 3.3 V logic levels.
10 Mbps in a 3.3 V system — what that means for the bus
At 10 Mbps the MAX3491ESD+ supports the faster edge rates needed for Profibus and similar industrial protocols running over RS-485. The 50 mV receiver hysteresis provides noise immunity on long cable runs, which matters when the bus spans tens of metres in a factory-floor environment. The full-duplex capability means separate transmit and receive pairs, so the bus can sustain continuous back-to-back data flow without turnaround dead time — useful for encoder feedback or real-time control loops.
Supply rail and temperature grade
Rated for 3 V to 3.6 V, this part is designed for a regulated 3.3 V rail. It is not 5 V tolerant on the supply side — if the rest of the board runs 5 V logic, level translation on the digital I/O pins is needed. The industrial temperature range (-40°C to 85°C) covers outdoor telecom cabinets, unheated factory floors, and engine-adjacent enclosures without needing a military-grade part.
Lifecycle and supply posture
The MAX3491ESD+ carries an Active lifecycle status with ROHS3 compliance.