IL4108-X001

Overview

The IL4108-X001 is a phototriac output optoisolator manufactured by Vishay Semiconductor Opto Division. It integrates a GaAs infrared LED with a photosensitive thyristor system featuring integrated zero-crossing detection and high dV/dt capability. The device provides 5300Vrms isolation voltage in a 6-DIP package. Key electrical parameters include a forward current of 2mA for triggering at a power factor of 1.0, and 5mA for a power factor of 0.7 or lower. It operates within a temperature range of -40°C to +100°C.

Feature Summary

• Integrated zero-crossing detection circuitry for reduced electromagnetic interference during switching
• High dV/dt rating to prevent false triggering from rapid voltage transients
• High input sensitivity allowing direct interface with standard logic outputs
• Optically coupled design ensuring galvanic isolation between control and load circuits

Applications

• Solid-state relay (SSR) driver circuits
• AC motor speed control systems
• Lighting dimmer applications
• Industrial process control interfaces

Procurement Notes

Verify the obsolete status of this specific part number before procurement planning. Confirm that alternative components meet the required isolation voltage and zero-crossing specifications. Ensure the replacement package matches the existing PCB footprint. Check for RoHS compliance requirements if applicable to the final assembly. Validate supplier authenticity due to potential end-of-life distribution channels.

Selection Notes

Select this component when zero-crossing switching is required to minimize electrical noise in AC loads. The high dV/dt immunity makes it suitable for noisy industrial environments. Consider the input current requirements relative to the driving logic level. Ensure the output triac current rating exceeds the maximum load current. Verify that the isolation voltage meets safety standards for the application.

Part Context

The IL4108 belongs to Vishay's family of phototriac output optocouplers designed for AC power control. It shares architectural similarities with the IL410 but includes integrated zero-crossing detection. This series is engineered for reliable switching of resistive and inductive AC loads. The device utilizes a silicon gate thyristor structure for robust performance.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The source indicates the IL4108-X001 is obsolete. Engineers must identify equivalent devices with matching zero-crossing features and isolation ratings through independent datasheet comparison.