The onsemi CNY17F2SR2M_F132 is officially marked obsolete by the manufacturer. No ongoing production; supply is limited to inventory held in independent distribution channels.
4170Vrms isolation and CTR window
Rated for 4170Vrms isolation between input and output — this is the galvanic barrier that protects low-voltage control circuits from high-voltage transients on the field side. The 4170Vrms figure is the 1-minute hipot test voltage per UL 1577; the working voltage in continuous service is lower and depends on the creepage distance across the 6-SMD Gull Wing package. This 2:1 spread means the receiver circuit must tolerate the full gain variation across units and temperature. A 63%-CTR unit at 10mA forward current delivers 6.3mA into the output load; a 125%-CTR unit delivers 12.5mA. The Vce saturation is 400mV max at the rated output current, so the voltage drop across the phototransistor when fully on stays under half a volt.
Switching speed and temperature range
Turn-on time is 2µs typical, turn-off 3µs typical; rise and fall times are 4µs and 3.5µs max respectively. This places the usable data rate in the low-kHz range — suitable for 50/60Hz line synchronisation, status feedback from contactors, or slow digital I/O isolation, but not for high-speed serial buses.
Board-fit and sourcing reality
The Gull Wing leads provide a visible solder fillet for AOI inspection. Tape & Reel packaging supports automated placement. For a BOM that requires this exact CTR window and package, the available path is surplus-channel sourcing against an RFQ.