The onsemi CNY172 is a single-channel optoisolator with a DC-input LED and a phototransistor output that brings the base terminal out — useful for biasing or Miller-effect compensation in high-speed switching circuits. Rated for 5300 Vrms isolation, it suits applications where galvanic separation between control and load sides must withstand mains transients or medical-grade creepage requirements. Current transfer ratio spans 63% to 125% at a forward current of 10 mA, giving the designer a predictable gain window for logic-level translation or isolated feedback loops.
Supplied in a 6-SMD gull-wing package (6-SMD), the CNY172 mounts on the surface of a PCB with a standard reflow profile — the gull-wing leads provide visual solder-joint inspection access. The tube packaging (Tube) means the parts are delivered in anti-static tubes; for pick-and-place, a tube feeder or manual loading is needed — no tape-and-reel option is listed.
Temperature grade and environment
Rated for an operating junction temperature range of -55°C to 100°C, the CNY172 covers industrial and some military/aerospace ambient conditions — the lower bound suits cold-start scenarios in outdoor or airborne equipment. The 5300 Vrms isolation rating is tested per the optoisolator standard; the part does not carry an explicit UL or IEC certification in the available record, so end-equipment safety certification should verify the isolation coordination at the system level.