AQY277A is a PhotoMOS solid-state relay designed for AC/DC dual-use switching applications. It features a load voltage rating of 200V (peak AC/DC) and a continuous load current of 0.65A, with a peak load current capability of 2.0A. The device offers high sensitivity with typical LED operate current of 1.0mA and low on-resistance of 0.7O typical. It provides 2,500V AC I/O isolation voltage and operates over a temperature range of -40°C to +85°C. The flat Power-DIP4-pin package with surface-mount terminals makes it suitable for measuring and testing equipment, IC testers, board testers, and high-speed inspection machines.