FOD4118SD

Triac, SCR Output Optoisolators Overview

The FOD4118SD is a six-pin surface-mount triac driver optocoupler from onsemi, designed for snubless zero-crossing applications. It integrates an infrared emitting diode with a hybrid triac output capable of driving high dv/dt loads without external snubber circuits. The device provides electrical isolation and features a black package variant to enhance resistance against UV degradation. It operates within a standard industrial temperature range and supports surface mount technology for automated assembly processes.

Triac, SCR Output Optoisolators Feature Summary

• Integrated zero-cross detection circuitry enables precise timing control for AC power switching applications.
• High dv/dt immunity allows direct drive of triacs in snubless configurations, reducing component count.
• Black package construction offers improved protection against ultraviolet light-induced leakage currents.

Triac, SCR Output Optoisolators Applications

• Solid-state relays requiring zero-crossing switching
• AC motor speed control systems
• Lighting dimmer circuits

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix designation to confirm the black package option and surface mount configuration. Ensure compatibility with the target PCB footprint and reflow soldering profile. Confirm that the required isolation voltage and current transfer ratio meet the design specifications for the intended load conditions.

Triac, SCR Output Optoisolators Selection Notes

Select this component when snubless operation and zero-crossing functionality are required for AC load control. Consider the surface mount package constraints and thermal management requirements. Evaluate the need for UV resistance if the application involves exposure to harsh environmental lighting conditions.

Triac, SCR Output Optoisolators Part Context

This part belongs to the FOD410 series of triac drivers, which includes variants like the FOD4108 and FOD4116. These devices share similar internal architectures but differ in packaging and specific feature sets such as package color or lead form. The SD suffix typically denotes a surface mount dip package variant.

Triac, SCR Output Optoisolators Replacement Considerations

Direct replacements include other members of the FOD410 series such as the FOD4108SD or FOD4116SD, provided pinout and functional specifications match. Verify that substitute parts maintain the same isolation ratings and package dimensions for board-level compatibility.