IL4118

Overview

The Vishay IL4118 is a single-channel optocoupler featuring an AlGaAs infrared LED optically coupled to a photosensitive zero-crossing triac network. It provides high isolation voltage of 5300Vrms and supports an off-state voltage of 800V. The device operates within a temperature range of -55°C to 100°C, ensuring reliable performance in demanding environments. Key electrical characteristics include a minimum static dV/dt of 10kV/µs and a typical forward voltage of 1.3V for the input LED.

Feature Summary

• Integrated zero-crossing detection circuitry for precise AC switching control
• High isolation voltage capability for safe signal transmission between circuits
• Robust noise immunity with high static dV/dt rating

Applications

• Solid-state relay (SSR) driver circuits
• AC power switching applications
• Motor control systems requiring phase-angle or zero-crossing triggering

Procurement Notes

Verify the specific suffix (e.g., X001, X007T) against the required packaging configuration, as these denote different reel or tube quantities. Confirm that the 5300Vrms isolation rating meets your safety certification requirements. Ensure the 800V off-state voltage is sufficient for your line voltage application. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.

Selection Notes

Select this component when zero-crossing operation is mandatory to minimize electromagnetic interference and inrush current. The 800V blocking voltage makes it suitable for universal AC mains applications. Consider the 6-DIP package for through-hole mounting convenience. Compare the 5300Vrms isolation against other models if higher voltage ratings are needed for specific industrial standards.

Part Context

The IL4118 belongs to Vishay's family of zero-crossing triac output optocouplers, alongside the IL4116 and IL4117. These devices share similar internal architectures but may differ in specific electrical parameters or packaging options. This series is designed for applications requiring reliable AC load switching with built-in timing synchronization to the AC waveform zero point.

Replacement Considerations

The onsemi FOD4118 is a functional equivalent offering similar zero-crossing triac output characteristics. Verify pinout compatibility and ensure the replacement part meets the same 5000Vrms or higher isolation requirements. Check if the substitute maintains the 800V off-state voltage and comparable dV/dt specifications for direct board-level substitution.