FOD4218SD

Triac, SCR Output Optoisolators Overview

The FOD4218SD is a random phase triac snubberless optocoupler from onsemi, featuring an infrared emitting diode coupled to a hybrid random phase triac. It provides electrical isolation with an insulation voltage of 5000 Vrms and supports a maximum continuous output current of 300 mA. The device operates within a temperature range of -55°C to +100°C and offers a peak repetitive off-state voltage (VDRM) of 800 V. Key electrical parameters include a maximum forward current of 30 mA, a typical forward voltage of 1.28 V, and a maximum turn-on time of 60 µs. It utilizes a 6-SMD surface-mount package.

Triac, SCR Output Optoisolators Feature Summary

• Snubberless design for random phase triac triggering
• High static dv/dt capability of 10 kV/µs
• Integrated hybrid random phase triac output

Triac, SCR Output Optoisolators Applications

• Solid state relays
• Motor control circuits
• Industrial process control systems

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape/reel specifications. Ensure compliance with RoHS directives and check for recent PCN updates regarding packaging or manufacturing site changes. Confirm that the supplier source aligns with authorized distribution channels to guarantee component authenticity and traceability.

Triac, SCR Output Optoisolators Selection Notes

Select this component for applications requiring snubberless operation and high noise immunity. The 10 kV/µs static dv/dt rating allows direct driving of triacs without external RC snubbers. Consider the 6-SMD footprint for space-constrained designs and verify thermal management requirements given the 500 mW power dissipation limit at elevated temperatures.

Triac, SCR Output Optoisolators Part Context

This part belongs to the FOD420 series, which includes variants like FOD4208, FOD4216, and FOD4218. These devices share a common architecture of an infrared LED coupled to a hybrid triac. The FOD4218SD specifically denotes the surface mount DIP-6 variant within this family, distinguished by its random phase triggering characteristics suitable for AC power control.

Triac, SCR Output Optoisolators Replacement Considerations

FOD4218SDV

Triac, SCR Output Optoisolators FAQ

Does the FOD4218SD include a zero-crossing circuit?

No, the FOD4218SD is designed for random phase triggering and does not incorporate a zero-crossing detection circuit.

What is the maximum static dv/dt rating for this device?

The device has a minimum static dv/dt rating of 10 kV/µs, enabling snubberless operation.