The AQY212GHAX is a 4-pin PhotoMOS relay designed for high-capacity switching with a continuous load current of 1.1 A and reinforced I/O isolation voltage of 5,000 V AC. This compact DIP package device features an on-resistance of 0.34 O (typical) and operates over a temperature range of -40°C to +85°C, with a turn-on time of 1.3 ms (typical) and turn-off time of 0.1 ms (typical). The relay supports AC/DC dual-use operation at 50 V load voltage and includes an LED input with a typical operate current of 1.1 mA and dropout voltage of 1.32 V at 50 mA. It is commonly used in measuring instruments, security systems, and alarm devices where electrical isolation and reliable switching performance are required.