The LTV-356T-C with SOP-4 Optocoupler, manufactured by Youtai, is a phototransistor output device designed to provide electrical isolation between input and output signals. It is RoHS compliant and is available in a surface mount package. The device features a high CTR rating of 1500% min, a low current transfer ratio of 72% max, and a high isolation voltage of 5000Vrms. The device is designed for applications such as signal relay, amplifier input protection, switching, and on-off sensing, and is suitable for use in a wide range of electronic devices.