EL817-V

Overview

The EL817-V is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It integrates an infrared emitting diode with a phototransistor detector, providing electrical isolation between input and output circuits. The device features a maximum insulation voltage of 5000 Vrms and operates within a temperature range of -55 °C to +110 °C. Key electrical parameters include a collector-emitter breakdown voltage of at least 35 V, a maximum forward current of 60 mA, and a typical current transfer ratio ranging from 50% to 600% at a forward current of 5 mA. The component is RoHS compliant and available in DIP-4 or SMD packages.

Feature Summary

• High isolation voltage capability between input and output channels
• Wide operating temperature range suitable for industrial environments
• Compact package options including through-hole and surface mount variants

Applications

• Signal isolation in microprocessor systems
• Switching power supply feedback loops
• Solid-state relay driver circuits

Procurement Notes

Verify the specific suffix code (e.g., M, S, S1) to confirm lead spacing or surface mount configuration. Ensure the datasheet version matches the required safety approvals such as UL or VDE. Confirm that the CTR binning meets circuit design requirements before procurement.

Selection Notes

Select based on required isolation voltage and package type. Verify the current transfer ratio specifications against the load requirements. Check for specific safety agency approvals needed for the target market. Consider thermal dissipation limits when designing the PCB layout.

Part Context

The EL817 series is a widely used family of optocouplers known for reliability in general-purpose isolation applications. Variants like the EL817-V denote specific compliance or packaging configurations within this established product line. The series offers multiple pin spacing and mounting options to accommodate diverse board designs.

Replacement Considerations

Direct substitutes may include other 4-pin transistor output optocouplers with similar isolation ratings and CTR ranges. Verify pinout compatibility and physical dimensions before substitution. Cross-reference safety certifications if regulatory compliance is critical.