S21ME8Y

Triac, SCR Output Optoisolators Overview

The S21ME8Y is a Triac output optoisolator manufactured by Sharp Microelectronics. It features an internal zero-crossing trigger circuit for low electromagnetic interference switching. The device provides 5000Vrms isolation voltage and supports an off-state voltage of 800V. It operates within a temperature range of -30°C to +100°C, with a forward current of 15mA and a forward voltage of 1.2V. The component utilizes a 6-DIP plugin package.

Triac, SCR Output Optoisolators Feature Summary

• Integrated zero-crossing detection circuitry for reduced noise generation during AC load switching
• High isolation capability rated at 5000Vrms between input and output circuits
• Robust off-state blocking voltage of 800V suitable for mains voltage applications

Triac, SCR Output Optoisolators Applications

• Solid state relays requiring zero-crossing turn-on
• AC motor speed control circuits
• Lighting dimmer switches
• Industrial process control isolation interfaces

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix variant against the original design specification, as Sharp part numbers often include code changes that may affect pinout or electrical characteristics. Confirm RoHS compliance status through the manufacturer's official documentation before integration. Check for obsolescence notices as this component type may have been superseded by newer series in the Sharp portfolio.

Triac, SCR Output Optoisolators Selection Notes

Select this component when zero-crossing switching is mandatory to minimize inrush current and radio frequency interference. Ensure the system voltage does not exceed the 800V off-state rating. Verify that the required isolation voltage meets the safety standards of the target application, specifically the 5000Vrms rating provided by this package.

Triac, SCR Output Optoisolators Part Context

This device belongs to Sharp's Triac and SCR Output Optocouplers category. It is designed for galvanic isolation in AC power control systems. The zero-crossing feature distinguishes it from random-phase triac optoisolators, making it ideal for applications where switching timing relative to the AC waveform is critical for performance and EMI reduction.

Triac, SCR Output Optoisolators Replacement Considerations

Direct replacements must match the 6-DIP package, 800V off-state voltage, and zero-crossing functionality. Verify that substitute components maintain the same 5000Vrms isolation rating and compatible forward current requirements to ensure circuit compatibility without redesign.