The CNY17 is an optically coupled pair consisting of a gallium arsenide infrared emitting diode optically coupled to a silicon NPN phototransitor. Signal information, including a DC level, can be transmitted by the device while maintaining a high degree of electrical isolation between input and output.

The CNY17 can be used to replace relays and transformers in many digital interface applications, as well as analog applications such as CRT modulation.

For CNY17-3 variance, CTR (Current Transfer Ratio, expressing the optocoupler gain) is between 100 to 200%. Available in 6-pin PDIP 300mil with pin pitch 0.1" (2.54mm).