AQY275A is a PhotoMOS solid-state relay designed for high-capacity AC/DC switching applications. It features a flat Power-DIP4-pin surface-mount package with dimensions of 8.8 × 9.3 × 3.9 mm and supports a load voltage of 100V (peak AC) with a continuous load current of 1.3A. The device offers high sensitivity with LED operate current of 1.0 mA typical and 3.0 mA maximum, along with an I/O isolation voltage of 2,500 Vrms. Operating over an ambient temperature range of -40°C to +85°C, it provides reliable performance in demanding environments. Common applications include measuring and testing equipment, IC testers, board testers, and high-speed inspection machines.