EL815

Overview

The EL815 is a single-channel photodarlington optocoupler manufactured by Everlight Electronics. It features a high current transfer ratio of at least 600% at an input current of 1 mA and collector-emitter voltage of 2 V. The device provides robust electrical isolation with a maximum insulation voltage of 5000 Vrms between the input LED and output transistor. It operates within a temperature range of -55 °C to +110 °C and dissipates up to 200 mW of power. The component utilizes a compact dual-in-line package suitable for through-hole mounting.

Feature Summary

• High current transfer ratio capability for efficient signal transmission
• High isolation voltage ensuring safe separation between circuits
• Wide operating temperature range for diverse environmental conditions

Applications

• Telephone sets and telephone exchangers
• Sequence controllers
• System appliances and measuring instruments
• Signal transmission between circuits of different potentials and impedances

Procurement Notes

Verify the specific suffix designation, such as M or V, to confirm lead spacing and compliance status. Confirm RoHS compliance details directly from the manufacturer documentation. Check for end-of-life status or availability constraints prior to finalizing design specifications. Ensure the selected variant matches the required packaging format for assembly processes.

Selection Notes

Select this component when high gain is required due to its photodarlington output structure. Consider the DIP-4 package dimensions for board layout constraints. Evaluate the 5000 Vrms isolation rating against system safety requirements. Compare the CTR specifications with other optocouplers if lower gain suffices for the application.

Part Context

The EL815 belongs to the Everlight photocoupler family designed for general-purpose isolation. It differs from standard phototransistor variants by offering significantly higher current gain. The series includes options for surface mount and varying lead spacings. It serves as a reliable interface for digital and analog signal coupling in industrial equipment.

Replacement Considerations

Cross-reference with EL817 series devices for similar isolation ratings but note differences in output type and current transfer ratio. Verify pinout compatibility before substituting with generic equivalents. Ensure replacement parts meet the same UL and VDE approval standards.