The EL817S(A)(TU)(ELEU) is a surface mount phototransistor optocoupler manufactured by Everlight Electronics Co Ltd. It consists of an infrared emitting diode (IRED) optically coupled to a phototransistor in a compact SMD package. This optocoupler provides electrical isolation between input and output circuits while enabling signal transfer.

Applications

• Programmable Controllers: Isolating input/output signals in industrial programmable logic controllers (PLCs).
• Office Automation Equipment: Signal isolation in copiers, fax machines, and printers.
• Power Supplies: Providing feedback isolation in switching power supplies and AC adapters.
• Telecommunication Equipment: Isolating data and control signals in telephone and network equipment.
• Measuring Instruments: Ensuring safe and accurate measurements by isolating sensitive circuits.

Features

• Surface Mount Package: Compact SMD package for automated assembly.
• High Isolation Voltage: Offers electrical isolation up to 5000 Vrms.
• Current Transfer Ratio (CTR): Provides various CTR grades to meet different application requirements.
• Low Saturation Voltage: Minimizes voltage drop across the output transistor.
• High Collector-Emitter Voltage: Supports higher voltage applications.
• RoHS Compliant: Meets environmental standards for hazardous substance restrictions.

Benefits

• Electrical Isolation: Protects sensitive circuits from high voltage transients and ground loops.
• Space Saving: Compact SMD package saves valuable board space.
• Improved Noise Immunity: Reduces the impact of electrical noise on signal integrity.
• Simplified Circuit Design: Facilitates easy interfacing between circuits with different voltage levels.
• Enhanced System Reliability: Increases system robustness by isolating potential fault sources.

Additional Details

The EL817S series comes in various CTR rankings, indicated by suffixes. The (A) in EL817S(A)(TU)(ELEU) typically indicates a specific CTR range. The (TU) usually indicates tape and reel packaging for automated assembly. (ELEU) could denote a specific manufacturing or electrical testing standard. The optocoupler typically operates within a temperature range of -30°C to +110°C. The forward voltage drop of the input LED is typically around 1.2V. Consult the detailed datasheet for specific CTR values, pinout diagrams, and soldering recommendations. Always refer to the official datasheet for complete and accurate specifications.