FOD4208V

Triac, SCR Output Optoisolators Overview

The FOD4208V is a random phase Triac output optocoupler manufactured by onsemi. It integrates an infrared emitting diode with a hybrid random phase Triac in a single package. The device features a maximum continuous output current of 300 mA and supports an off-state output voltage (VDRM) of 800 V. It operates without a zero-crossing circuit, allowing for snubberless operation in AC power control applications. Key electrical parameters include a forward current (If) of 30 mA, a forward voltage (Vf) of 1.28 V, and a power dissipation (Pd) of 500 mW. 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

• Integrates an infrared LED coupled to a hybrid random phase Triac for AC load switching
• Enables snubberless operation due to high dv/dt capability inherent in the random phase design
• Provides high isolation voltage of 5000 Vrms between input and output circuits
• Operates without zero-crossing detection, allowing firing at any point in the AC cycle

Triac, SCR Output Optoisolators Applications

• Solid state relays for AC power control
• Motor speed control circuits
• Lighting dimmer applications
• General purpose AC load switching

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'V' indicates the PDIP-6 through-hole package configuration when ordering. Confirm RoHS compliance status via the manufacturer's official documentation or certified datasheet before finalizing procurement. Ensure the supplier provides traceable component history. Cross-reference the manufacturer part number FOD4208V with authorized distributor catalogs to validate authenticity and avoid counterfeit components.

Triac, SCR Output Optoisolators Selection Notes

Select this component for applications requiring random phase triggering rather than zero-crossing switching. It is suitable for driving AC loads up to 800 V peak reverse voltage. Consider the 300 mA continuous current rating against the actual load requirements. The PDIP-6 package is appropriate for through-hole PCB assembly processes. Evaluate thermal management needs based on the 500 mW power dissipation limit under operating conditions.

Triac, SCR Output Optoisolators Part Context

The FOD4208V belongs to the FOD4208 series of Triac & SCR Output Optocouplers from onsemi. This series is designed for general-purpose AC power control where precise timing relative to the AC zero-crossing is not required. It serves as an interface between low-voltage DC control logic and higher-voltage AC power stages, providing electrical isolation and noise immunity in industrial and consumer electronic systems.

Triac, SCR Output Optoisolators Replacement Considerations

Compatible substitutes within the same family include FOD4208SDV for surface mount applications. Other random phase Triac optocouplers may serve as functional replacements if pinout and electrical ratings match. Verify package compatibility and isolation voltage specifications when substituting.