Based on the packaging and the visible marking on the reel label, this appears to be an EVERLIGHT SMD Optocoupler (Photocoupler) supplied by SUN IMPEX. The part code on the label looks like KUV 806CT-1417 (the image resolution makes the exact suffix difficult to read). The package shown is a 4-pin SMD optocoupler. Product Overview * Manufacturer: Everlight Electronics * Product Type: Optocoupler -Photocoupler * Package: Surface-Mount Device (SMD) * Mounting: Tape & Reel packaging * RoHS Compliant: Yes (shown on label) * Quantity per Reel: 2000 pcs (visible on label) What an Optocoupler Does An optocoupler transfers a signal between two electrically isolated circuits using an internal LED and phototransistor. This provides: * Electrical isolation * Noise immunity * Protection of low-voltage circuits from high-voltage sections * Improved system reliability Typical Applications * SMPS power supplies * Industrial control boards * PLCs and automation equipment * Battery chargers * Inverters and UPS systems * Microcontroller isolation circuits * Signal transmission between circuits at different voltage levels Key Features of Everlight Optocouplers * High isolation voltage * Compact SMD package * Low power consumption * RoHS compliant * Reliable signal isolation for industrial applications