FOD4218S

Triac, SCR Output Optoisolators Overview

The FOD4218S is a random phase triac output optocoupler from onsemi, featuring an infrared emitting diode coupled to a hybrid triac. It provides 5000 Vrms isolation and supports a maximum continuous output current of 300 mA with an off-state voltage of 800 V. The device operates without zero-crossing circuitry, enabling snubberless applications. Key electrical parameters include a forward current of 30 mA, forward voltage of 1.28 V, power dissipation of 500 mW, and a maximum turn-on time of 60 us. It functions within a temperature range of -55°C to +100°C.

Triac, SCR Output Optoisolators Feature Summary

• Random phase triac output enables snubberless operation for AC load control
• High insulation voltage of 5000 Vrms ensures robust electrical isolation
• Hybrid construction combines infrared LED with triac for reliable switching

Triac, SCR Output Optoisolators Applications

• Industrial AC motor controls
• Solid state relays
• Power supply feedback circuits

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'S' indicates the SMD-DIP-6 surface mount package variant. Confirm RoHS compliance status through official documentation. Ensure the procurement channel provides valid traceability for the onsemi manufacturer identification. Check for any specific handling requirements related to the hybrid triac component structure.

Triac, SCR Output Optoisolators Selection Notes

Select this component when snubberless AC switching is required in isolated environments. The random phase characteristic allows triggering at any point in the AC cycle, suitable for phase control applications. Verify that the 300 mA output current meets the load requirements and that the 800 V blocking voltage exceeds peak line voltages.

Triac, SCR Output Optoisolators Part Context

This device belongs to the FOD4218 series, which includes variants like FOD4218SV. The series utilizes a hybrid technology integrating an infrared LED with a triac output. The FOD4218S specifically denotes the surface mount version packaged in a 6-lead SMD-DIP configuration, distinguishing it from through-hole alternatives.

Triac, SCR Output Optoisolators Replacement Considerations

Direct substitutes within the same family include FOD4218SV. Verify pinout compatibility and package dimensions before substitution. Ensure the replacement part maintains the same random phase triac output characteristics and isolation voltage ratings.