The AQY210EHAZ is a PhotoMOS GE 1 Form A relay featuring reinforced insulation rated at 5,000 Vrms, enabling high-voltage isolation between input and output circuits. This 4-pin DIP device is optimized for AC/DC dual-use applications with a maximum load voltage of 350 V (peak AC) and a continuous load current rating of 130 mA, delivering low on-resistance and high sensitivity for low-level analog signal control. The relay exhibits excellent performance characteristics including a maximum LED dropout voltage of 1.25 V at 50 mA input current, low off-state leakage current of maximum 1 µA, and operates reliably across an ambient temperature range of -40°C to +85°C. Typical applications include modem circuits, telephone equipment, industrial plant control, security systems, and sensing equipment where galvanic isolation and low-level signal switching are required.