IL4218

Overview

The IL4218 is a phototriac output optocoupler manufactured by Vishay Semiconductor Opto Division. It features a high isolation voltage of 5300Vrms and operates with a very low input current, typically 20mA forward current. The device provides an off-state voltage of 800V to 850V and supports a maximum continuous output current of 300mA. It is available in a 6-pin PDIP package with gull-wing leads, suitable for surface mount or through-hole applications. The unit functions without a zero-crossing circuit and exhibits high dV/dt capability.

Feature Summary

• Phototriac output configuration designed for AC load switching applications
• High dV/dt immunity to prevent false triggering in noisy environments
• Very low input current requirement for efficient drive from logic interfaces
• Robust insulation barrier rated at 5300Vrms for safety isolation

Applications

• Solid state relays for AC power control
• Motor control circuits requiring isolated switching
• Industrial automation systems with AC loads
• Consumer appliances utilizing triac-based regulation

Procurement Notes

Verify the specific suffix code (e.g., X017T) against the manufacturer's latest datasheet to confirm packaging type and reel specifications. Ensure the selected variant matches the required lead form and moisture sensitivity level for your assembly process. Cross-reference the official Vishay documentation for any recent product change notices affecting pinout or electrical characteristics.

Selection Notes

Select this component when high isolation voltage and fast switching speed are critical. The low input current makes it suitable for driving from low-power microcontrollers. Consider the 800V off-state voltage rating to ensure compatibility with the peak line voltage of the application. Verify thermal dissipation requirements as the power dissipation is limited to 300mW.

Part Context

This device belongs to Vishay's family of high-performance optocouplers featuring phototriac outputs. It is engineered for applications requiring reliable isolation between control electronics and high-voltage AC lines. The design emphasizes noise immunity and low power consumption on the input side while maintaining robust switching capabilities on the output side.

Replacement Considerations

Publicly confirmed substitute part numbers include CNY17F-3X001 and IL4218-X019. Verify that replacement units maintain the same phototriac output type and isolation voltage ratings. Check for compatibility in package dimensions and pin configurations before integration.