EL814

Overview

The EL814 is a single-channel optocoupler featuring an AC input configuration with two infrared emitting diodes connected in inverse parallel, optically coupled to an NPN phototransistor detector. It operates within a temperature range of -55°C to +110°C and provides a high isolation voltage of 5000 Vrms. Key electrical parameters include a maximum collector-emitter voltage of 80V, a typical forward voltage of 1.2V, and a maximum forward current of 60mA. The device exhibits rise and fall times of 7µs and 11µs respectively, with a power dissipation rating of 200mW.

Feature Summary

• AC input response capability enabled by dual inverse-parallel infrared LEDs
• High isolation voltage between input and output channels
• Wide operating temperature range suitable for demanding environments
• Compact dual-in-line package design

Applications

• AC mains detection circuits
• Solid-state relay driver interfaces
• Microcontroller isolation for AC signal monitoring
• Industrial control system input stages

Procurement Notes

Verify the specific ordering suffix (e.g., TU, TB) to confirm the correct packaging type, such as tape and reel or tube, as this affects handling and assembly compatibility. Ensure compliance requirements like RoHS and UL recognition match the target application standards. Cross-reference the manufacturer's latest datasheet revision to confirm pinout consistency and any updates to absolute maximum ratings before finalizing procurement specifications.

Selection Notes

Select this component when AC signal isolation is required without external rectification circuitry due to the integrated inverse-parallel LED structure. Consider the 80V collector-emitter voltage limit for output side compatibility. Evaluate the thermal management needs given the 200mW power dissipation and wide temperature range. Verify that the CTR range meets the switching requirements of the downstream logic or transistor stage.

Part Context

The EL814 belongs to Everlight's EL814 series of 4-pin DIP phototransistor optocouplers designed specifically for AC input applications. This series utilizes a unique internal architecture where two LEDs are connected in inverse parallel to handle alternating current directly. It serves as a cost-effective solution for isolating AC signals from low-voltage DC control circuits in industrial and consumer electronics.

Replacement Considerations

Check for direct pin-compatible alternatives within the same series or similar AC-input optocouplers from other manufacturers. Verify that substitute parts maintain the 5000 Vrms isolation rating and 80V output voltage capability. Confirm that the replacement offers comparable current transfer ratio and switching speed characteristics.