The EL817(D)-F is a general-purpose phototransistor optocoupler manufactured by Everlight Electronics Co Ltd. It consists of an infrared emitting diode (IRED) optically coupled to a phototransistor. This optocoupler is designed for various isolation and signal transfer applications.

Applications

• Power Supply Feedback Control: Used in power supplies for feedback control, providing isolation between the primary and secondary sides.
• Industrial Control Systems: Employed in industrial control systems for isolating input and output signals, protecting sensitive components.
• Consumer Electronics: Utilized in consumer electronic devices for signal isolation and voltage level shifting.
• Motor Control: Suitable for use in motor control circuits for isolating control signals from the power stage.
• Telecommunications Equipment: Implemented in telecommunications equipment for signal isolation and noise reduction.

Features

• Phototransistor Output: Features a phototransistor output for interfacing with various electronic circuits.
• High Isolation Voltage: Provides high isolation voltage between the input and output sides.
• Compact Package: Available in a compact package, suitable for space-constrained applications.
• CTR (Current Transfer Ratio): Offers a good current transfer ratio, ensuring efficient signal transfer.
• Safety Approvals: Typically approved by various safety agencies such as UL, VDE, and CSA.
• DIP-4 Package: Commonly available in a DIP-4 package for easy integration into circuit boards.

Benefits

• Electrical Isolation: Provides electrical isolation between input and output circuits, protecting sensitive components from high voltages and transients.
• Improved Signal Integrity: Isolates signals and reduces noise, improving signal integrity.
• Enhanced Safety: Safety approvals ensure compliance with safety standards and regulations.
• Easy Integration: The DIP-4 package allows for easy integration into circuit boards.
• Versatile Application: Suitable for a wide range of isolation and signal transfer applications.

Additional Details

The EL817(D)-F optocoupler's performance is characterized by its current transfer ratio (CTR), isolation voltage, and forward voltage of the IRED. It is essential to consult the official datasheet from Everlight Electronics for detailed electrical characteristics, CTR curves, and application notes before integrating this component into a design. The (D) suffix often indicates a specific CTR ranking. External resistors are typically required on both the input (LED) and output (transistor) sides for proper operation.