Optocouplers are commonly used in electronic circuits to provide electrical isolation between input and output circuits, protecting sensitive components from high voltages, noise, and voltage spikes. The EL817 is typically used in applications such as:
- Isolation of control signals in power electronics
- Communication between low-voltage and high-voltage systems
- Signal isolation in industrial automation systems
- Feedback and control circuits in switch-mode power supplies
- Isolation of signals in motor control circuits
Development:
The EL817 Optocoupler Surface Mount (SMD) component is integrated into circuit designs using surface-mount technology (SMT). Designers incorporate it into their PCB layouts, ensuring proper placement and connection of input and output terminals to achieve the desired electrical isolation and signal transmission.
Specifications:
| Specification | Details |
|---|---|
| Isolation Voltage | Maximum voltage between input and output |
| Input Current | Current required to activate the LED on the input side |
| Output Current | Maximum current through the output transistor |
| Response Time | Time for the output transistor to switch on or off |
| Operating Temperature Range | Temperature range for reliable operation |
| Forward Current Transfer Ratio (CTR) | Ratio of output current to input current |
| Package Type | Surface-mount package (e.g., SOIC, SOP) |
| Dimensions | Physical dimensions of the component |
Features:
- Electrical Isolation: Provides galvanic isolation between input and output circuits, preventing the passage of electrical currents and voltages.
- Compact Design: Surface-mount package allows for compact and space-efficient PCB designs.
- High Reliability: Designed for long-term operation in harsh industrial environments, with high immunity to noise voltage transients.
- Fast Response Time: Allows for rapid signal transmission between isolated circuits.
- Low Input Power: The LED input requires low power for activation, making it suitable for energy-efficient applications.
- RoHS Compliance: May comply with RoHS regulations, ensuring environmental sustainability.
Manufacturer and Availability
- Manufacturer: The EL817 is produced by various manufacturers, including Everlight Electronics, Lite-On, and Vishay.
- Part Number Variations: Depending on the manufacturer, the part number may have slight variations such as EL817S or EL817C.
Compliance and Standards
- RoHS Compliance: The EL817 typically complies with the Restriction of Hazardous Substances (RoHS) directive, making it environmentally friendly by restricting the use of specific hazardous materials.
- UL Certification: Many versions of the EL817 are UL certified, ensuring they meet safety standards for electrical and electronic devices.
Packaging and Handling
- Packaging Type: The EL817 SMD is usually available in tape and reel packaging for automated assembly processes.
- Handling Precautions: It is recommended to follow standard ESD (Electrostatic Discharge) precautions while handling the EL817 to avoid damage.
Performance Characteristics
- Response Time: The EL817 offers a response time suitable for general signal isolation purposes, typically in the microsecond range.
- Isolation Capacitance: The device has low isolation capacitance, which helps in minimizing the coupling of transient signals.
Reliability and Durability
- Life Span: Optocouplers like the EL817 are designed for long-term reliability, with a typical lifespan exceeding tens of thousands of hours under normal operating conditions.
- Thermal Stability: The device maintains stable performance over a wide temperature range, ensuring consistent operation in various environments.
Design Considerations
- PCB Layout: When designing the PCB, ensure proper spacing and layout to maintain isolation integrity and to avoid electrical noise interference.
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