The 115 kbps data rate covers the majority of industrial sensor networks, PLC links, and building-automation loops without forcing a higher-speed part that would trade off EMI margin.
At 115 kbps the driver slew rate is controlled enough to keep radiated emissions low over unshielded twisted pair up to a few hundred metres. This is the sweet spot for Modbus RTU, BACnet MS/TP, and similar polled protocols. If your application needs to push past 1 Mbps — for example, daisy-chaining servo drives with position updates — this part will not get you there; you would step up to the SN65HVD1781 or a 10 Mbps variant in the same family.
The wide supply tolerance means the same BOM line can serve a 3.3 V design and a 5 V design without a separate regulator or level shifter. The 50 mV receiver hysteresis cleans up noise on long cable runs where ground potential difference can reach a few volts. Both driver and receiver are active from the same rail, so there is no separate VIO pin to route.
For a dual-sourcing strategy, the SN65HVD1781DG4 is a pin-compatible sibling in the same SOIC-8 footprint — the main difference is a higher data rate (1 Mbps vs 115 kbps), so verify your bus timing margin before substituting.