AQY225R2SZ is a miniature SOP4-pin PhotoMOS relay designed for low-level analog signal control applications requiring high isolation and minimal signal distortion. It features exceptionally low output capacitance of 4.5 pF (typical) and an on-resistance of 10.5 O (typical), optimized for 80V load voltage operation with a maximum continuous load current of 0.15 A. The device incorporates a low-level off-state leakage current of 0.01 nA (typical), making it ideal for precision measurement and testing applications. With a compact package measuring 4.3 × 4.4 × 2.1 mm and operating temperature range of -40°C to +85°C, it is well-suited for IC testers, semiconductor performance testers, telecommunication equipment, and medical instrumentation where signal integrity and reliability are critical.