The EL817S(B)(TU) is a single-channel phototransistor optocoupler manufactured by Everlight Electronics Co. Ltd. It is designed for electrical isolation in various applications, providing a safe separation between circuits operating at different voltage levels. The device consists of an infrared emitting diode optically coupled to a phototransistor.

Applications

• Power supplies: Isolation between primary and secondary sides.
• Industrial control systems: Isolating sensitive control circuitry from high-voltage or noisy environments.
• Microprocessor input/output isolation: Protecting microprocessors from voltage spikes and surges.
• Signal transmission between systems of different potentials: Ensuring safe and reliable data transfer.
• Noise isolation in communication equipment: Preventing interference and improving signal quality.

Features

• High isolation voltage: Provides robust electrical isolation, typically up to 5000 Vrms.
• Compact package: Space-saving design for high-density circuit boards.
• Current transfer ratio (CTR): Offers a range of CTR values, ensuring compatibility with various circuit designs. (Specific CTR values depend on the rank).
• Low saturation voltage: Minimizes power dissipation and improves efficiency.
• Compliance with safety standards: Meets industry safety requirements for isolation devices.

Benefits

• Enhanced safety: Protects users and equipment from electrical hazards.
• Improved system reliability: Isolates sensitive circuits from noise and voltage transients.
• Simplified circuit design: Reduces the need for complex and expensive isolation techniques.
• Increased system performance: Minimizes signal distortion and improves data transfer rates.
• Cost-effective solution: Provides a reliable and affordable isolation solution.

Additional Details

The EL817S(B)(TU) is available in a surface-mount package. It operates over a wide temperature range, typically from -30°C to +110°C, making it suitable for use in harsh environments. The device is RoHS compliant, ensuring it meets environmental regulations.

Specific CTR ranking (B) determines the current transfer ratio range, which is a critical parameter for selecting the appropriate optocoupler for a given application. Consult the manufacturer's datasheet for detailed specifications, including CTR ranges, isolation voltage, and operating temperature range.