Specifications: The APY274AEH is a medium-voltage PhotoMOS SSR in a tiny SMD-4 package. This 1 Form A (SPST-NO) relay is rated for 350mA load current and 400V load voltage (AC/DC). It has an 8Ω on-state resistance, provides high 5000Vrms isolation, and switches with 500μs (on) and a fast 30μs (off) time. It operates from -40°C to 85°C with a 1.0-1.4VDC input range. Application Scenarios: Designed for applications requiring safe switching at several hundred volts in a minimal space. Common applications include industrial sensor power isolation, medical device auxiliary power switching, power supply sequencing and monitoring, solid-state lighting ballasts, and as an isolation component in test equipment for medium-voltage circuits.