Specifications: The APV221EH is the surface-mount SMD-6 version of a versatile PhotoMOS SSR. It is a 1 Form A (SPST-NO) relay rated for 200mA load current and 60V load voltage (AC/DC). It has a 3Ω 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℃ with a 1.2-1.4VDC input. Application Scenarios: A general-purpose surface-mount relay for low-power isolation and switching. Suitable for industrial control system I/O cards, data acquisition systems, test equipment channel switching, medical device patient isolation circuits, and as a reliable interface in network devices, offering the same balanced performance as the DIP version in an SMD package for automated assembly.