EL817(S1)(D)(TA)

Overview

The EL817(S1)(D)(TA) is a single-channel transistor output optocoupler manufactured by Everlight Electronics. It integrates an infrared emitting diode with an NPN phototransistor detector in a surface-mount package. The device provides electrical isolation with a rated insulation voltage of 5000 Vrms and a creepage distance exceeding 7.62 mm. Key electrical parameters include a collector-emitter breakdown voltage of 35 V, a maximum forward current of 50 mA, and a typical current transfer ratio ranging 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 between input and output circuits
• Compact surface-mount small outline package design
• Compliant with lead-free and RoHS environmental standards

Applications

• Digital logic signal transmission and conversion
• Power supply control and switching circuits
• Electrical insulation isolation between circuits and systems
• Impedance transformation applications

Procurement Notes

Verify the specific suffix configuration against official Everlight documentation to ensure correct packaging and compliance status. Confirm availability as distribution channels may list this component as discontinued or restricted. Cross-reference the manufacturer part number with authorized distributor databases to validate authenticity and technical specifications before procurement.

Selection Notes

Select this component for applications requiring robust galvanic isolation in compact surface-mount designs. Ensure the circuit design accommodates the specified 5000 Vrms isolation rating and the operating temperature range up to 110°C. Verify that the required current transfer ratio meets the system's logic level requirements under the intended operating conditions.

Part Context

This component belongs to the EL817 series of optocouplers, which are widely used for general-purpose isolation. The series typically offers various package options including DIP and SMD configurations. The EL817(S1)(D)(TA) specifically denotes a surface-mount variant with defined lead pitch and compliance markings, distinguishing it from through-hole equivalents within the same functional family.

Replacement Considerations

Equivalent parts include other 4-pin SMD transistor output optocouplers with similar isolation ratings. Verify pinout compatibility and electrical characteristics such as CTR and breakdown voltage when substituting.