ELD205(TA)

Overview

The ELD205(TA) is a dual-channel transistor output optocoupler manufactured by Everlight Electronics. It integrates an infrared emitting diode and phototransistors in an 8-pin SOP package to provide electrical isolation between input and output circuits. The device offers an insulation voltage of 3750 Vrms, ensuring high safety standards for signal transmission. Key electrical parameters include a minimum current transfer ratio of 40% at 10 mA forward current and a maximum of 80% under the same conditions. Typical switching times are specified as 5 µs for turn-on and 4 µs for turn-off. The unit supports a maximum collector-emitter voltage of 80 V and operates within a temperature range of -55°C to 110°C.

Feature Summary

• Dual-channel configuration for simultaneous signal isolation
• High insulation voltage rating for enhanced safety
• Fast switching speed suitable for digital logic applications

Applications

• Digital logic signal transmission and conversion
• Power supply control and switching circuits
• Electrical isolation between circuit stages or systems

Procurement Notes

Verify the specific suffix (TA) against the manufacturer's datasheet to confirm packaging type and moisture sensitivity level. Ensure compatibility with surface-mount assembly processes given the SOP-8 form factor. Cross-reference the part number with official Everlight documentation to distinguish it from similar variants like ELD205(TB)-V, which may have different pinouts or performance characteristics. Confirm RoHS compliance status through official environmental declarations before procurement.

Selection Notes

Select this component when dual-channel isolation is required within a compact footprint. The 3750 Vrms insulation rating makes it suitable for applications demanding robust galvanic separation. Consider the 40-80% current transfer ratio range for driving subsequent logic stages. Verify that the 80 V output voltage capability meets the load requirements. The wide operating temperature range supports deployment in industrial environments where thermal stability is critical for reliable signal integrity.

Part Context

The ELD205 series belongs to Everlight's family of transistor output optocouplers designed for general-purpose isolation tasks. These devices utilize infrared technology to convert electrical signals into optical ones and back again, providing noise immunity and ground loop elimination. The SOP-8 package allows for automated surface-mount placement, facilitating efficient manufacturing integration. This series is commonly used in consumer electronics, industrial controls, and communication interfaces requiring reliable data transfer across isolated boundaries.

Replacement Considerations

Check for direct substitutes such as ELD205(TB)-V, noting potential differences in channel count or specifications. Verify pinout compatibility with existing PCB layouts before substitution. Ensure that any replacement maintains the required 3750 Vrms isolation voltage and operates within the same temperature range. Consult official cross-reference lists from Everlight or authorized distributors to confirm functional equivalence.