5000Vrms isolation — where this optocoupler fits
That isolation voltage targets applications where galvanic separation is mandatory — think industrial motor drives, switch-mode power supply feedback loops, PLC digital inputs, and any interface between a high-voltage power stage and a low-voltage control circuit. The 4-SMD gull-wing package suits automated surface-mount assembly, and the DC input side simplifies drive from a microcontroller GPIO or logic gate.
Typical turn-on time is 6µs, turn-off 5µs, with rise and fall times of 3µs and 4.7µs respectively.