The CNY17F4TVM is a single-channel, DC-input, transistor-output optocoupler from onsemi in a through-hole 6-DIP package with 0.400-inch (10.16 mm) pin spacing. It provides 4170Vrms galvanic isolation between the input LED and the output phototransistor, making it a candidate for safety barriers in industrial controls, motor drives, and isolated sensor interfaces. The current transfer ratio (CTR) is specified at 160% minimum and 320% maximum when the LED is driven at 10 mA forward current. That 2:1 min-to-max spread means the output-side logic must tolerate the full gain range — a design consideration for pull-up resistor sizing and noise margin on the receiving gate.
Switching speed and drive budget
Typical turn-on time is 2 µs and turn-off time is 3 µs, with rise and fall times of 4 µs and 3.5 µs (max). These numbers place the part in the medium-speed class — adequate for 50/60 Hz line-frequency isolation and slow digital signals, but not for high-speed data links like I²C or SPI at MHz rates. The output transistor can sink up to 50 mA continuous with a maximum collector-emitter voltage of 70 V. The saturation voltage is held to 400 mV max at rated current, which keeps the logic-low level well within TTL thresholds when the output is pulled up through a resistor to the supply rail.
Temperature range and production status
The LED forward voltage is 1.35 V typical at 10 mA, and the absolute maximum forward current is 60 mA — derate above 25°C per the datasheet curve. onsemi lists this part as Active in production.