The EL817S(A) is a single-channel phototransistor output optocoupler manufactured by Everlight Electronics Co., Ltd. It provides electrical isolation between input and output circuits, allowing for safe signal transfer in various applications.

Applications

• Programmable Controllers
• System Appliances
• Measuring Instruments
• Signal Transmission between Circuits of Different Potentials and Impedances

Features

• High Collector-Emitter Voltage (VCEO): The EL817S(A) features a high collector-emitter voltage, providing a wide operating range and robust performance.
• Current Transfer Ratio (CTR): Offers various CTR ranges depending on the specific grade (A, B, C, D), allowing flexibility in circuit design. The CTR ensures efficient signal transfer from the input LED to the output transistor.
• Electrical Isolation: Provides a high degree of electrical isolation between the input and output, protecting sensitive circuits from high voltages and noise.
• Compact Package: Available in a small outline package (SOP), minimizing board space requirements.
• RoHS Compliant: Ensures compliance with environmental regulations.

Benefits

• Safety: Provides electrical isolation, protecting circuits and personnel from high voltage hazards.
• Noise Immunity: Reduces noise and interference in signal transmission.
• Versatility: Suitable for a wide range of applications due to its various CTR options and voltage ratings.
• Space Saving: The compact package allows for high-density circuit designs.
• Reliability: Everlight Electronics is a reputable manufacturer, ensuring high quality and reliability.

Additional Details

The EL817S(A) typically consists of an infrared emitting diode (IRED) optically coupled to a phototransistor. When current flows through the IRED, it emits infrared light, which activates the phototransistor, allowing current to flow in the output circuit. The current transfer ratio (CTR) is an important parameter that defines the ratio of output collector current to input forward current. Different grades of the EL817S(A) offer varying CTR ranges. The isolation voltage is another critical parameter, specifying the maximum voltage that the optocoupler can withstand between the input and output circuits. Proper selection of the CTR grade and isolation voltage is essential for optimal performance and safety in specific applications.

It is available in different package types including through-hole and surface mount options. The operating temperature range usually spans from -30°C to +100°C. It's a widely used and readily available optocoupler.