The AQY210SZ is a PhotoMOS solid-state relay designed for controlling low-level analog signals in a miniature SOP4-pin package. It operates with a load voltage of 350V and a continuous load current of 120mA, featuring a maximum on-resistance of 25Ω. This AC/DC dual-use relay provides 1,500 Vrms of I/O isolation and maintains a low off-state leakage current of 1µA maximum. Its characteristics make it ideal for applications such as telecommunication equipment, measuring and testing instruments, factory automation, and security systems.