FOD4218SDV

Triac, SCR Output Optoisolators Overview

The FOD4218SDV is a single-channel Triac output optocoupler from onsemi, designed for snubberless random phase triac applications. It features a PhotoTriac output capable of handling a maximum continuous output current of 300 mA and blocking voltages up to 800 V. The device provides robust isolation with an insulation voltage of 5000 Vrms. Key electrical parameters include a forward current of 30 mA, a forward voltage of 1.28 V, and a power dissipation rating of 500 mW. It operates within a temperature range of -55°C to +100°C and utilizes a 6-SMD surface-mount package.

Triac, SCR Output Optoisolators Feature Summary

• Snubberless design enables direct triggering of random phase triacs without external RC networks
• High static dV/dt immunity reduces false triggering in noisy environments
• Integrated zero-crossing detection is absent, allowing for precise phase control applications

Triac, SCR Output Optoisolators Applications

• Solid-state relay circuits requiring snubberless operation
• AC motor speed control systems
• Lighting dimmer applications
• Heater control modules

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'SDV' corresponds to the 6-SMD鸥翼 (gull-wing) package configuration as documented in the official datasheet. Confirm that the ordering part number matches the required tape and reel or cut tape packaging options available from authorized distributors. Ensure compliance with RoHS directives and material declarations specified by onsemi for environmental standards.

Triac, SCR Output Optoisolators Selection Notes

Select this component when snubberless triac driving is required to simplify circuit design and reduce component count. The high insulation voltage of 5000 Vrms makes it suitable for industrial isolation requirements. Consider the 60 µs turn-on delay and 1.3 mA max trigger current for timing-sensitive phase control designs. Ensure the PCB layout supports the SMD-DIP-6 footprint and thermal dissipation needs for the 500 mW power rating.

Triac, SCR Output Optoisolators Part Context

This device belongs to the FOD4218 series of Triac & SCR Output Optocouplers. It is distinct from zero-crossing variants like the FOD4108SDV, which includes internal zero-crossing circuitry. The FOD4218SDV is specifically engineered for random phase applications where immediate triac firing upon signal receipt is necessary, contrasting with zero-crossing devices that delay firing until the AC waveform crosses zero.

Triac, SCR Output Optoisolators Replacement Considerations

Direct substitutes within the same family include FOD4208SD, which shares similar specifications but may have different trigger current characteristics. Verify pinout compatibility and package dimensions before substitution. Cross-reference with other snubberless triac optocouplers from onsemi or competitors ensuring matching isolation voltage, current ratings, and package type.