FOD4108V

Triac, SCR Output Optoisolators Overview

The FOD4108V is a single-channel Triac and SCR output optocoupler manufactured by onsemi, designed for snubberless triac driver applications. It integrates an infrared LED with a hybrid photo-triac structure featuring an integrated zero-crossing detection circuit. The device operates in a 6-pin DIP package with through-hole mounting. Key electrical specifications include a maximum repetitive peak off-state voltage of 800 V and a maximum continuous output current of 300 mA. It supports a forward input current up to 30 mA with a typical forward voltage of 1.25 V. The unit provides 5000 Vrms isolation voltage and functions within a temperature range of -55°C to +100°C.

Triac, SCR Output Optoisolators Feature Summary

• Integrated zero-crossing detection circuit enables snubberless operation by triggering the output triac only when the AC line voltage is near zero.
• High static dv/dt rating ensures reliable switching performance and immunity to voltage transient interference without external snubber networks.
• Hybrid photo-triac output structure combines high blocking voltage capability with efficient light coupling for robust signal isolation.

Triac, SCR Output Optoisolators Applications

• Solid-state relay (SSR) designs requiring galvanic isolation and noise immunity
• Motor control circuits for AC induction motors and solenoids
• Industrial process control systems utilizing TRIAC-based power regulation

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'V' corresponds to the required packaging configuration, as it typically indicates bulk packaging rather than tape and reel. Confirm that the 6-pin DIP form factor aligns with the target PCB footprint and assembly method. Ensure the 800 V blocking voltage meets the peak line voltage requirements of the application. Cross-reference the RoHS compliance status with current environmental regulations for the destination market.

Triac, SCR Output Optoisolators Selection Notes

Select this component when snubberless operation is required to reduce bill-of-materials count and improve efficiency in AC power switching. The integrated zero-crossing feature minimizes electromagnetic interference and inrush current compared to random-phase devices. Consider the 300 mA output current limit for load sizing. The wide operating temperature range suits harsh industrial environments where thermal stability is critical for consistent triac triggering.

Triac, SCR Output Optoisolators Part Context

The FOD4108V belongs to the FOD4108 series of Triac and SCR output optocouplers from onsemi. This family is engineered for driving discrete TRIACs in AC power control applications. The series distinguishes itself by combining high isolation voltage with integrated zero-crossing logic, eliminating the need for external timing or snubber components. It serves as a compact solution for isolating low-voltage control logic from high-voltage AC loads.

Triac, SCR Output Optoisolators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify pinout compatibility and electrical parameters if considering alternative manufacturers. Note that suffix variations may indicate different packaging options rather than functional changes.