Specifications: The APY217E is a through-hole DIP-4 PhotoMOS SSR, a 1 Form A (SPST-NO) device rated for 200mA load current and 200V load voltage (AC/DC). It features a 5Ω on-state resistance, 5000Vrms isolation, and switching times of 400μs (turn-on) and 50μs (turn-off). It operates from -40°C to 85℃ with a 1.2-1.4VDC input. Application Scenarios: A compact through-hole relay for medium-voltage switching. Common applications include telecom and networking equipment signal/power switching, industrial sensor interface and isolation, medical device auxiliary controls, power supply sequencing, and as a reliable switch in test and measurement equipment, offering the benefits of a small DIP package for prototyping or designs not using SMT.