AQY284SX is a 4-pin SOP PhotoMOS relay designed for general-purpose switching applications requiring high voltage isolation. It features a maximum load voltage of 400V (peak AC) with a continuous load current rating of 100mA, making it suitable for high-voltage control circuits. The relay exhibits low on-resistance of 20O typical and 25O maximum at maximum load current, combined with extremely low off-state leakage current of 1µA, ensuring stable operation without metallic contact parts. With an operating temperature range of -40°C to +85°C and I/O isolation voltage of 1,500V AC, the AQY284SX is ideal for modem, telephone equipment, security systems, and sensor applications where reliable high-voltage switching and galvanic isolation are essential.