Isolation barrier and signal transfer
The CNY174SVM: Rated for 4170 Vrms isolation — this is the test voltage between input and output, certifying the optocoupler for reinforced isolation in mains-referenced circuits where the working voltage demands a barrier that withstands transient overvoltage without breakdown. Current transfer ratio spans 160% to 320% at a forward current of 10 mA — the min CTR guarantees that a 10 mA LED drive produces at least 16 mA of collector current in the output phototransistor, which sets the pull-down capability at the load side. Output transistor rated for 70 V max across the collector-emitter path and 50 mA continuous output current — sufficient for driving logic-level inputs, relay coils, or small DC loads in isolated feedback paths.
Switching speed and temperature envelope
Typical turn-on time of 2 µs and turn-off time of 3 µs, with rise/fall times of 4 µs and 3.5 µs respectively — this switching speed suits 10-100 kHz isolated communication (e.g., IGBT gate-drive feedback, isolated SPI) where the propagation delay and edge rates stay within the timing budget.