FOD4218V

Triac, SCR Output Optoisolators Overview

The FOD4218V is a single-channel Triac output optocoupler designed for random phase triggering applications. It features a PhotoTriac output capable of handling a maximum continuous on-state current of 300 mA and blocking voltages up to 800 V. The device provides robust electrical isolation with an insulation voltage rating of 5000 Vrms. Key electrical parameters include a forward current of 30 mA, a forward voltage of 1.28 V, and a power dissipation capacity of 500 mW. It operates within a temperature range of -55°C to +100°C and utilizes a PDIP-6 through-hole package.

Triac, SCR Output Optoisolators Feature Summary

• Random phase triac output configuration suitable for snubberless AC control circuits
• High blocking voltage capability supporting demanding industrial load conditions
• Integrated zero-crossing circuit absence allows for precise phase angle firing

Triac, SCR Output Optoisolators Applications

• Solid state relays for AC load switching
• Industrial motor control systems requiring random phase triggering
• Lighting dimmer circuits for incandescent or resistive loads

Triac, SCR Output Optoisolators Procurement Notes

Verify the manufacturer designation carefully, as this component has been transitioned from Fairchild Semiconductor to onsemi. Ensure the ordering suffix matches the required packaging format, such as tube quantities for standard distribution. Confirm RoHS compliance status and specific datasheet revisions prior to finalizing procurement orders to guarantee compatibility with current manufacturing standards.

Triac, SCR Output Optoisolators Selection Notes

Select this component when random phase triggering is required rather than zero-crossing switching. The 300 mA on-state current rating supports moderate power loads without external heat sinking in most standard DIP-6 configurations. Consider the 5000 Vrms isolation barrier for safety-critical interfaces between low-voltage control logic and high-voltage AC mains.

Triac, SCR Output Optoisolators Part Context

This device belongs to the FOD4218 series of Triac drivers manufactured by onsemi (formerly Fairchild). It is part of a family of 6-pin DIP optocouplers designed for AC power control applications. The series distinguishes itself by offering random phase operation, contrasting with zero-crossing variants like the FOD4118V, providing flexibility for phase-angle control implementations.

Triac, SCR Output Optoisolators Replacement Considerations

The FOD4218S serves as a pin-compatible alternative within the same product family. Verify that the substitute maintains identical random phase characteristics and electrical ratings. Cross-reference datasheets to ensure interface compatibility and thermal performance match the original design requirements.