The Texas Instruments ISO7731FBDW is a three-channel, unidirectional digital isolator using capacitive coupling to pass signals across a reinforced 5000Vrms isolation barrier.
Key ratings and what they mean for your BOM
The 5000Vrms isolation voltage qualifies this part for reinforced insulation, so it can sit on the safety barrier between a motor-drive controller and the high-voltage power stage without needing a separate isolated DC-DC module.
That means you can qualify it into a new design without worrying about a forced respin inside the product lifecycle. The part is RoHS3 compliant and ships in a tube. For dual-sourcing resilience, the closest functional match in the same family is the ISO7830DWWR: same 100Mbps data rate, same 16ns propagation delay, but with all three channels on the same side (3/0 input count) and a higher 5700Vrms isolation rating. If your design needs the 2/1 channel split, the ISO7731FBDW is the one to hold; if you can rework the pin assignment, the ISO7830DWWR is a drop-in alternative on the same 16-SOIC footprint.