The CNY17F1SVM: 4170 Vrms isolation voltage means this opto withstands a 4 kV transient between primary and secondary without breakdown — enough for reinforced insulation in a 230 VAC mains circuit where the creepage path across the 6-SMD gull wing package is the limiting factor, not the internal gap. Current transfer ratio is specified as 40% min to 80% max at If=10 mA. The 40% floor means a 10 mA LED drive produces at least 4 mA at the phototransistor collector — enough to pull a 5 V logic input low through a 1 kΩ pull-up. The 80% ceiling prevents the output from saturating too hard and slowing the turn-off time. Vce saturation is 400 mV max at the rated output current — the voltage drop across the output transistor when fully on. At 50 mA output, 400 mV means 20 mW dissipation in the phototransistor, well within the package's thermal budget at 100°C ambient.
Speed and temperature — switching a 24 V PLC input
Turn-on time is 2 µs typ, turn-off 3 µs typ, with rise/fall times of 4 µs and 3.5 µs max. This translates to a practical switching frequency around 100 kHz — fast enough for a 24 V PLC input filtering a 10 kHz encoder pulse train, but not for a 1 MHz SMPS feedback loop. Operating temperature from -40°C to 100°C covers industrial control cabinets and outdoor telecom shelters. The 100°C upper limit is the junction temperature — derate the 50 mA output current above 85°C ambient per the standard phototransistor derating curve.
Package and board fit — 6-SMD gull wing
6-SMD gull wing package, supplier device package 6-SMD. Bulk packaging means tubes or trays, not tape and reel; plan for hand placement or tube-fed pick-and-place.