Quad RS-422/RS-485 line driver in 16-TSSOP
The MAX3040EUE+ is a dedicated quad driver for RS-422 and RS-485 networks, handling four differential outputs from a single 5V rail. With a data rate of 250 kbps, it fits industrial fieldbus links and PLC backplanes where signal integrity over twisted-pair cabling matters more than raw speed.
The supply range is tight at 4.75V to 5.25V — this is a pure 5V part. Do not feed it 3.3V; the outputs won't swing enough to meet RS-485 thresholds. If your BOM runs mixed 3.3V/5V logic, a level translator sits between the controller and this driver. The 16-TSSOP's thermal impedance is moderate; at 85°C ambient the junction stays within limits as long as the output current per channel stays under the datasheet's short-circuit limit.
For a repair bench or a new design, you are not chasing sunset inventory. The MAX3040EUE+ is ROHS3 compliant, which clears it for lead-free assembly lines without exemption paperwork.