FOD4108T

Triac, SCR Output Optoisolators Overview

The FOD4108T is a Triac and SCR output optocoupler featuring an integrated zero-crossing circuit. It consists of an infrared LED coupled to a hybrid triac structure with two back-to-back SCRs. Key electrical parameters include a 5000 Vrms isolation voltage, 800 V blocking voltage (VDRM), and a maximum continuous output current of 300 mA. The device operates within a temperature range of -55°C to +100°C, supports a forward current of 30 mA, and utilizes a 6-pin PDIP package for through-hole mounting.

Triac, SCR Output Optoisolators Feature Summary

• Integrates a zero-crossing detection circuit to minimize electromagnetic interference during AC switching
• Provides high dv/dt noise immunity to prevent false triggering in noisy environments
• Features snubberless operation capability for simplified circuit design
• Offers robust electrical isolation suitable for safety-critical applications

Triac, SCR Output Optoisolators Applications

• Solid-state relay control systems
• AC motor speed control circuits
• Lighting dimmer applications
• Heating element control interfaces

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'T' against the manufacturer's current product status, as availability may vary. Confirm that the 6-pin DIP package aligns with your PCB layout requirements. Ensure the 800 V blocking voltage meets the peak line voltage specifications of your target application. Cross-reference the latest datasheet for any updates on compliance standards or recommended operating conditions prior to finalizing the bill of materials.

Triac, SCR Output Optoisolators Selection Notes

Select this component when high-voltage isolation and precise phase control are required. The integrated zero-crossing feature makes it ideal for applications demanding low EMI. Consider the 300 mA output current limit for load sizing. The PDIP-6 package facilitates easy prototyping and through-hole assembly. Evaluate the 5000 Vrms insulation rating against regulatory safety requirements for your specific market.

Triac, SCR Output Optoisolators Part Context

The FOD4108T belongs to the FOD410x series of Triac driver optocouplers from onsemi. This family includes variants like the FOD4108 and FOD4118, distinguished by blocking voltages and trigger sensitivities. The series is designed for driving external Triacs in AC power control applications. The 'T' suffix typically denotes a specific tape-and-reel or bulk packaging configuration within the standard DIP-6 form factor.

Triac, SCR Output Optoisolators Replacement Considerations

The FOD4108SD is a documented alternative within the same series offering identical electrical characteristics but potentially different packaging. Verify pinout compatibility and thermal performance before substitution. Other series members like the FOD4108 share similar functionality but may differ in specific voltage ratings or trigger currents.