The EL817M(C)-F is an optocoupler manufactured by Everlight. It is a four-pin dual-channel phototransistor output optocoupler in a DIP (dual in-line package) configuration. It complies with the Restriction of Hazardous Substances (RoHS) directive and is suitable for applications requiring high insulation and low input current, such as noise rejection in power supplies and signal transmission between digital circuits. The optocoupler features a high current transfer ratio (CTR) over a wide temperature range and is capable of handling input currents up to 50mA. It also features a high contrast ratio of 8,000:1 for applications requiring a wide dynamic range. The optocoupler is RoHS-compliant and offers a long service life and high reliability.