The AQY214EHA is a PhotoMOS solid-state relay featuring reinforced insulation of 5,000 Vrms and a 1 Form A output configuration for AC/DC dual-use applications. It is rated for a maximum load voltage of 400 V (peak AC/DC) with a continuous load current of 120 mA, and operates with an LED forward current range of 5–30 mA. The device exhibits low on-resistance and minimal off-state leakage current (maximum 1 µA), making it suitable for controlling low-level analog signals with high sensitivity. Operating over an ambient temperature range of -40°C to +85°C, the AQY214EHA is commonly used in modem, telephone equipment, plant control systems, security equipment, and sensing applications where galvanic isolation and reliable switching are required.