EL825

Overview

The EL825 is a dual-channel photodarlington output optocoupler manufactured by Everlight Electronics Co Ltd. It features an infrared emitting diode coupled to two phototransistors in a Darlington configuration, housed in an 8-pin DIP package. The device provides high current transfer ratio and isolation voltage of 5000Vrms, suitable for applications requiring robust signal transmission with electrical isolation between input and output circuits.

Feature Summary

• Dual-channel photodarlington output configuration
• High isolation voltage rating of 5000Vrms
• Infrared LED emitter paired with Darlington phototransistors

Applications

• Industrial control systems
• Signal isolation in measurement equipment
• Power supply feedback loops

Procurement Notes

Verify the specific suffix variant (e.g., M, TB, TA) against the required pinout and packaging specifications. Confirm RoHS compliance status if environmental regulations apply. Check availability through authorized distributors as stock levels may vary. Ensure the selected package matches the PCB footprint requirements.

Selection Notes

Select this component when high gain and fast switching are not critical but high isolation voltage is required. Compare current transfer ratio requirements against application needs. Consider thermal management if operating at high ambient temperatures. Verify compatibility with control logic levels.

Part Context

Part of the EL8xx series from Everlight, designed for general-purpose optoisolation. Shares common characteristics with other dual-channel variants in the family. Offers a cost-effective solution for basic isolation tasks where moderate speed is acceptable.

Replacement Considerations

Check datasheets for compatible alternatives such as EL817 or PC817 equivalents. Verify pin compatibility and electrical parameters before substitution. Ensure replacement parts meet the same isolation voltage and CTR requirements.