FOD420

Triac, SCR Output Optoisolators Overview

The FOD420 is a single-channel optocoupler featuring an infrared emitting diode coupled to a hybrid random phase triac. It provides electrical isolation with a rated insulation voltage of 5000 Vrms and supports a maximum forward current of 30 mA. The device operates within a temperature range of -55°C to +100°C, dissipating up to 500 mW. Key electrical parameters include a peak off-state voltage of 600 V, a maximum trigger current of 2 mA, and a typical turn-on time of 60 µs. Packaged in a PDIP-6 through-hole configuration, it lacks zero-crossing circuitry.

Triac, SCR Output Optoisolators Feature Summary

• Integrates an infrared LED with a hybrid random phase triac for robust signal isolation
• Provides high-voltage isolation capability suitable for demanding industrial environments
• Features snubberless design characteristics for simplified circuit implementation

Triac, SCR Output Optoisolators Applications

• Solid-state relay driver circuits
• Industrial motor control systems
• AC power switching applications

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific package variant required, as onsemi offers both through-hole (PDIP) and surface-mount (SMD) versions under similar naming conventions. Confirm that the selected part matches the intended mounting style and lead configuration. Ensure the random phase triac output aligns with the application's timing requirements, as zero-crossing variants differ functionally.

Triac, SCR Output Optoisolators Selection Notes

Select this component when high dv/dt immunity and random phase triggering are necessary for AC load control. The absence of zero-crossing detection allows for immediate response to input signals, which is critical for phase-angle control applications. Evaluate thermal management capabilities given the 500 mW power dissipation limit and ensure the operating temperature range fits the system environment.

Triac, SCR Output Optoisolators Part Context

The FOD420 belongs to the FOD420 series of optocouplers from onsemi, designed for general-purpose isolation tasks. It is part of a family that includes variations such as the FOD4208 and FOD4216, which may offer different packaging or performance specifications. This series targets applications requiring reliable triac driving with galvanic isolation between control and power stages.

Triac, SCR Output Optoisolators Replacement Considerations

Compatible substitutes include the FOD4208 and FOD4216, which share similar functional architectures. Verify pinout compatibility and package dimensions before substitution. Surface-mount alternatives like the FOD420SDV offer equivalent functionality in a different form factor.