FOD4118S

Triac, SCR Output Optoisolators Overview

The FOD4118S is a high dv/dt zero-cross triac driver optocoupler from onsemi, featuring a single channel with a hybrid triac output. It provides 5000Vrms isolation and supports an 800V breakover voltage. Key electrical parameters include a maximum turn-on time of 60µs, a minimum static dv/dt of 10kV/µs, and a maximum LED trigger current of 1.3mA. The device operates within a temperature range of -55°C to 100°C and is housed in a surface-mount 6-SMD package.

Triac, SCR Output Optoisolators Feature Summary

• Integrated zero-cross detection circuitry for precise switching timing
• High noise immunity with a minimum static dv/dt rating of 10kV/µs
• Snubberless design capability for simplified circuit implementation
• Hybrid triac output structure for reliable high-voltage control

Triac, SCR Output Optoisolators Applications

• Solid-state relay (SSR) driver circuits
• AC motor speed control systems
• Industrial process control interfaces
• Power supply switching applications

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'S' denotes the surface-mount variant distinct from the through-hole 'T' version. Confirm RoHS compliance status via the latest datasheet revision. Check for obsolescence notices as older DIP versions may be discontinued. Ensure the supplier provides official onsemi documentation to validate pinout and thermal characteristics for SMD assembly.

Triac, SCR Output Optoisolators Selection Notes

Select this component when snubberless operation is required to reduce external passive components. Choose the SMD package for automated surface-mount assembly processes. Verify that the 800V blocking voltage meets the load requirements. Ensure the 1.3mA trigger current compatibility with the driving logic level. Consider the 5000Vrms isolation barrier for safety-critical AC mains applications.

Triac, SCR Output Optoisolators Part Context

The FOD4118S belongs to the FOD4118 family of high-performance triac drivers. This series includes variants like the FOD4118T for through-hole mounting. The family is designed for industrial AC power control, offering superior dv/dt immunity compared to standard optocouplers. It integrates zero-cross detection to minimize electromagnetic interference during switching events.

Triac, SCR Output Optoisolators Replacement Considerations

The FOD4118TV is a listed similar replacement part from onsemi. Verify pinout compatibility between the SMD and TQFP/SMD variations if substituting. Cross-reference technical specifications with competitors like Vishay IL4118-X006 only if functional equivalence is confirmed by datasheets.