EL817(S)(A)(TU)

Overview

The EL817(S)(A)(TU) is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It integrates an infrared emitting diode with a phototransistor detector in a surface-mount 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 60 mA, and a collector current of 50 mA. The typical current transfer ratio ranges from 100% to 600% at a forward current of 5 mA. Operating temperature spans from -55 °C to +110 °C.

Feature Summary

• Provides galvanic isolation via optical coupling between input LED and output phototransistor
• Features high insulation voltage capability for safe signal transmission across potential barriers
• Designed for compact surface-mount integration in space-constrained electronic assemblies

Applications

• Signal isolation in industrial control systems
• Feedback loop isolation in switching power supplies
• Communication interface isolation in data transmission equipment

Procurement Notes

Verify the specific CTR binning requirements against the datasheet specifications before ordering. Confirm that the SMD package dimensions match the target PCB footprint. Ensure compliance with RoHS directives if required by the end application. Check for any specific tape and reel type requirements for automated assembly processes.

Selection Notes

Select this component when surface-mount technology is required for the optocoupler function. Consider the 5000 Vrms isolation rating for applications requiring significant potential difference between circuits. Evaluate the CTR range to ensure sufficient gain for the intended load conditions. Verify thermal management capabilities within the specified operating temperature range.

Part Context

This part belongs to the EL817 series of optocouplers, which are widely used for general-purpose isolation. The series includes various packaging options such as DIP and SMD types. The (S) suffix indicates a surface-mount variant, while (TU) typically denotes tape and reel packaging. This family is known for reliability in industrial and consumer electronics applications.

Replacement Considerations

Direct replacements may include other EL817 series variants with compatible pinouts and electrical characteristics. Verify that substitute components meet the same isolation voltage and CTR specifications. Ensure the replacement package matches the physical constraints of the existing design.