FOD4108SDV

Triac, SCR Output Optoisolators Overview

The FOD4108SDV is a single-channel triac output optocoupler featuring an integrated zero-crossing detection circuit. It combines an infrared emitting diode with a hybrid triac formed by two back-to-back SCRs, designed to drive discrete triacs in snubless applications. The device offers high static dv/dt immunity and supports peak on-state currents of 300 mA with a blocking voltage of 800 V. It provides 5000 Vrms isolation and operates within a temperature range of -55°C to +100°C.

Triac, SCR Output Optoisolators Feature Summary

• Integrates zero-crossing detection for reduced electromagnetic interference during AC switching
• Provides high static dv/dt immunity to prevent false triggering from voltage transients
• Features a hybrid triac structure capable of driving discrete triacs without external snubber circuits

Triac, SCR Output Optoisolators Applications

• Solid-state relays requiring snubless operation
• AC motor control systems
• Lighting dimmer circuits
• Heater control applications

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'SDV' against the manufacturer's official datasheet to confirm package type and tape-and-reel specifications. Ensure that the zero-crossing functionality aligns with the target AC line frequency requirements. Cross-reference safety certifications such as UL and VDE for the intended region. Confirm that the 800 V blocking voltage meets the peak reverse voltage demands of the load circuit.

Triac, SCR Output Optoisolators Selection Notes

Select this component when snubber-less triac driving is required to simplify PCB layout and reduce component count. The integrated zero-crossing feature makes it suitable for applications demanding low EMI generation. Compare the 800 V blocking voltage against higher voltage alternatives if the application involves higher line voltages. Evaluate the trigger current sensitivity relative to the available drive signal strength from the microcontroller or logic interface.

Triac, SCR Output Optoisolators Part Context

The FOD4108SDV belongs to the FOD410 series of high dv/dt zero-cross triac drivers from onsemi. This family includes variants like FOD410, FOD4116, and FOD4118, which share similar architectural principles but differ in blocking voltage and trigger sensitivity. The series is designed for robust AC power control applications where reliable isolation and transient immunity are critical.

Triac, SCR Output Optoisolators Replacement Considerations

Compatible substitutes include FOD4108S and FOD4108V, which share the same core electrical characteristics and pinout. Verify that any alternative part maintains the 800 V blocking voltage and zero-crossing functionality. Ensure the replacement package matches the existing footprint and thermal requirements.