EL815(S)(TA)

Overview

The EL815(S)(TA) is a single-channel photodarlington output optocoupler manufactured by Everlight Electronics Co Ltd. It features a high current transfer ratio of 600% minimum at IF=1mA and VCE=2V, ensuring efficient signal transmission. The device provides robust electrical isolation with a maximum insulation voltage of 5000 Vrms between input and output circuits. Designed for through-hole or surface-mount applications depending on the specific suffix variant, it operates within a temperature range of -55°C to +110°C. Key electrical parameters include a maximum collector-emitter saturation voltage of 1V and a continuous collector current capacity of 80mA.

Feature Summary

• High current transfer ratio capability for sensitive signal detection
• Strong electrical isolation performance between input and output sides
• Wide operating temperature range suitable for industrial environments

Applications

• Industrial control systems requiring galvanic isolation
• Signal switching in low-power electronic circuits
• Microcontroller interface isolation for noise immunity

Procurement Notes

Verify the exact suffix configuration (e.g., TA, TB, S1) as these denote specific packaging types such as tape and reel or tube. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability may vary by region. Ensure the selected package matches the PCB footprint requirements before ordering.

Selection Notes

Select this component when high gain is required from a single channel without additional amplification stages. Consider the slow rise and fall times inherent to photodarlington outputs; they are unsuitable for high-speed digital communication but ideal for DC or low-frequency AC switching applications where isolation voltage ratings are critical.

Part Context

This part belongs to the EL81x series of transistor output optocouplers from Everlight. The series includes variants like EL816 and EL817, which differ primarily in output transistor type (Darlington vs. NPN). The EL815 specifically utilizes a photodarlington structure to achieve higher current transfer ratios compared to standard phototransistor counterparts in the same family.

Replacement Considerations

Direct substitutes include other photodarlington optocouplers with similar isolation voltages and CTR specifications, such as the PC815 or TLP785. Verify pinout compatibility and package dimensions before substitution to ensure mechanical fit and correct electrical operation.