Specifications: The APY221E is a compact DIP-4 packaged PhotoMOS SSR with a 1 Form A (SPST-NO) configuration. It is rated for 200mA load current and 60V load voltage (AC/DC). It has a 2Ω on-state resistance, provides 5000Vrms isolation, and features symmetrical, fast 50μs switching for both on and off states. It operates from -40°C to 85°C with a 1.2-1.4VDC control input. Application Scenarios: A versatile relay for general-purpose low-power switching with excellent isolation. Commonly used in industrial I/O modules, programmable logic controller (PLC) interfaces, security and alarm system controls, test and measurement equipment signal routing, and as a reliable interface between microcontrollers and various AC/DC loads in consumer and commercial electronics.