onsemi has classified the CNY17F1W as Obsolete.
Isolation barrier and switching performance
Switching is specified with typical turn-on time of 2 µs and turn-off time of 3 µs, and typical rise/fall times of 1 µs and 2 µs respectively. This places the CNY17F1W in the standard-speed phototransistor optocoupler class — adequate for 50/60 Hz line synchronisation, relay driver isolation, and digital signal feedback at low-to-moderate data rates.
CTR range and drive margin
Current transfer ratio is guaranteed between 40% and 80% at a forward current of 10 mA. This bin (the '1' suffix) gives a narrower CTR window than the wide-bin CNY17 — useful when the downstream logic or microcontroller input needs a predictable collector current without overdriving the LED. At 10 mA forward, the minimum 40% CTR yields 4 mA at the output transistor collector — enough to saturate a TTL or 5 V CMOS input with a 1 kΩ pull-up resistor. The maximum output current per channel is 50 mA, and the output transistor can block up to 70 V.
Housed in a 6-pin DIP with 0.400-inch (10.16 mm) body width, through-hole mounting. The supplier device package is listed as 6-DIP. This is the standard dual-in-line phototransistor optocoupler footprint — compatible with legacy layouts and hand-assembly or wave-solder processes. The tube packaging is typical for through-hole DIP parts handled in low-to-medium volume assembly.