EL817(S)(C)(TA)

Overview

The EL817(S)(C)(TA) is a single-channel transistor output optocoupler manufactured by Everlight Electronics Co Ltd. It features an infrared emitting diode optically coupled to an NPN phototransistor in a surface-mount 4-SMD package. The device provides high isolation voltage of 5000 Vrms and operates within a temperature range of -55°C to +110°C. Key electrical parameters include a maximum collector-emitter voltage of 35V, a maximum forward current of 60mA, and a nominal current transfer ratio of 200% at 5mA input.

Feature Summary

• High isolation voltage capability between input and output circuits
• Compact surface-mount package design for space-constrained applications
• Wide operating temperature range suitable for industrial environments
• Compliant with international safety standards including UL and VDE

Applications

• Industrial control systems requiring signal isolation
• Power supply feedback loops
• Communication interface isolation
• Microcontroller input/output isolation

Procurement Notes

Verify the specific suffix (S)(C)(TA) matches your board layout requirements, as packaging variations exist within the EL817 family. Confirm RoHS compliance status if required by your manufacturing process. Check official Everlight documentation for exact reel quantities and tape specifications before ordering. Ensure the supplier provides traceable datasheets matching this exact part number to avoid substitution errors.

Selection Notes

Select this component when surface-mount technology is required for the EL817 form factor. The SMD package differs from the standard DIP-4 version, necessitating different PCB footprints. Verify that the 5000Vrms isolation rating meets your system's safety requirements. Consider the 200% minimum CTR for logic level compatibility with downstream components.

Part Context

This part belongs to the EL817 series of optocouplers, which are widely used for electrical isolation. The EL817 series includes both through-hole DIP and surface-mount SMD variants. The (S) designation typically indicates the surface-mount package type, while (C) often refers to the specific current transfer ratio grouping or lead-free configuration depending on the manufacturer's coding scheme.

Replacement Considerations

Direct replacements may include other EL817 SMD variants such as EL817(S)(A)(TA) or EL817(S)(B)(TA), provided the current transfer ratio ranges are compatible. Verify pinout compatibility and package dimensions before substituting. Generic equivalents like PC817 SMD versions may fit mechanically but require verification of electrical parameters.