The APY211G3E is a high-current Photo MOS Solid State Relay designed for reliable, isolated switching in medium-power applications. It features a robust 2.5A load current capability at up to 40V, with ultra-low on-state resistance of 55mΩ, minimizing conduction losses and thermal stress. The device offers 5000Vrms isolation voltage, ensuring safe separation between control and load circuits. With a fast turn-off time of 20μs and a turn-on time of 800μs, it is optimized for applications requiring rapid deactivation. Operating from -40°C to 85°C, it supports industrial and automotive environments. Input voltage is 1.2–1.4VDC, compatible with standard logic levels. Housed in a compact DIP-4 through-hole package, it is ideal for PCB-mounted systems.