Isolation rating and where it fits
The 6N135SVM: The 5000Vrms isolation is the deciding parameter for this optocoupler — it provides galvanic separation between a low-voltage control side and a high-voltage power stage, typical in motor drives, industrial PLC I/O modules, and switch-mode power supply feedback paths. The 8-SMD Gull Wing package is a surface-mount footprint that reflows onto a PCB without through-hole assembly, though the gull-wing leads are visible for post-solder inspection.
Current transfer ratio and switching speed
The current transfer ratio spans 7% minimum to 50% maximum at a forward current of 16 mA. That 7% floor is the gain the designer must guarantee across temperature and device variation — if the downstream logic needs a 2.5 V swing into a 10 kΩ load, the 8 mA output current capability per channel sets the pull-up resistor ceiling. Typical turn-on time is 230 ns, turn-off 450 ns, fast enough for 1 MHz data rates but not for high-speed isolated communication like Ethernet.
onsemi lists the 6N135SVM as Active and ROHS3 compliant.
The DC input type means the LED is driven by a steady forward current, not an AC waveform.