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The OSB5SA3131A-12V is an Optosupply optocoupler and logic isolator. It includes an optically coupled NPN phototransistor output and is suitable for AC or DC input voltage. It is hermetically sealed in a 4 pin dual inline package and is UL approved. It is used to isolate a load and protect circuits from damage due to overcurrent, overvoltage, and ESD. It features a 600 Vrms isolation voltage and a compact, low-profile design. It is designed for applications like motor control, power supplies, and power switches.