FOD4208

Triac, SCR Output Optoisolators Overview

The FOD4208 is a six-pin snubberless random phase TRIAC driver optocoupler manufactured by onsemi. It integrates an infrared emitting diode coupled to a hybrid random phase TRIAC capable of driving discrete TRIACs. The device features a maximum turn-on time of 60 microseconds and a maximum trigger current of 2 mA. It provides 5000 Vrms isolation voltage and supports a maximum continuous output current of 300 mA with an off-state output voltage (VDRM) of 800 V. The component operates within a temperature range of -55°C to +100°C and is available in MDIP packaging.

Triac, SCR Output Optoisolators Feature Summary

• Snubberless design eliminates the need for external RC snubber networks
• Hybrid random phase TRIAC output structure for robust switching
• High dv/dt immunity for reliable operation in noisy environments

Triac, SCR Output Optoisolators Applications

• Solid state relay control circuits
• Motor speed control systems
• Lighting dimmer applications

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific ordering suffix against the official onsemi datasheet to ensure correct package type and tape/reel specifications. Confirm that the procurement channel sources genuine components directly from authorized distributors or the manufacturer to avoid counterfeit devices. Check for updated device numbers as per manufacturer notices regarding part number revisions.

Triac, SCR Output Optoisolators Selection Notes

Select this component when snubberless operation is required to reduce bill of materials complexity. Ensure the load current does not exceed the 300 mA continuous rating. Verify that the application requires random phase triggering rather than zero-crossing functionality, as this device does not include zero-crossing detection circuitry.

Triac, SCR Output Optoisolators Part Context

The FOD4208 belongs to the FOD420 series of high dv/dt TRIAC drivers. This family includes related models such as the FOD420, FOD4216, and FOD4218. These devices are designed for industrial and consumer applications requiring isolated TRIAC control with high noise immunity and simplified external circuitry requirements.

Triac, SCR Output Optoisolators Replacement Considerations

Compatible substitutes within the same family include the FOD420, FOD4216, and FOD4218. Verify pinout compatibility and electrical parameter alignment before substitution.