EL817(D)-V

Overview

The EL817(D)-V is a surface-mount transistor output optocoupler manufactured by Everlight Electronics. It integrates an infrared emitting diode with a phototransistor detector in a compact 4-pin SMD package. The device provides high isolation voltage of 5000 Vrms between input and output circuits. Key electrical parameters include a collector-emitter breakdown voltage of 35 V, a maximum forward current of 50 mA, and a typical forward voltage of 1.2 V. The current transfer ratio ranges from 300% to 600% at a forward current of 5 mA. It operates within a temperature range of -55 °C to +110 °C.

Feature Summary

• High isolation voltage capability for safe signal transmission across isolated domains
• Compact surface mount design suitable for automated assembly processes
• Wide operating temperature range ensuring reliability in diverse environments
• Compliant with international safety standards including UL, VDE, and RoHS

Applications

• Signal isolation in industrial control systems
• Power supply feedback loops
• Microcontroller interface circuits
• Communication equipment isolation

Procurement Notes

Verify the specific suffix 'D' confirms the surface mount package type and lead configuration as distinct from through-hole variants. Confirm RoHS compliance status and specific safety agency approvals required for your target market. Ensure the supplier provides original manufacturer documentation to validate authenticity and traceability.

Selection Notes

Select this component when surface mount technology is required for space-constrained designs. The 5000 Vrms isolation rating makes it suitable for applications requiring robust galvanic isolation. Consider the 300-600% CTR range for driving logic inputs or small loads directly. Verify thermal management requirements given the 110 °C maximum junction temperature limit.

Part Context

The EL817 series is a widely used family of optocouplers known for cost-effectiveness and reliability. The EL817(D)-V specifically denotes the surface mount variant, differing from the standard DIP packages like EL817(C). This series is commonly utilized in general-purpose isolation applications where moderate speed and high isolation are necessary.

Replacement Considerations

Direct pin-compatible replacements may include other EL817 series variants such as EL817(S)(D)-V or EL817(S1)(D)(TA)-V, provided the package dimensions and electrical characteristics match the design requirements. Always verify datasheet specifications before substitution.