ACST435-8FP

Overview

The ACST435-8FP is an 800 V AC Switch from STMicroelectronics, designed as a rugged alternative to conventional Triacs for appliance and industrial applications. It integrates a Triac structure with a high-voltage clamping device to absorb inductive turn-off energy and withstand line transient voltages. The device features a sensitive gate option allowing direct drive from microcontrollers and improved commutating dV/dt and dI/dt capabilities. Packaged in TO-220FPAB, it enables appliances to meet IEC 61000-4-4 and -4-5 standards without external snubber circuits when limits are respected.

Feature Summary

• Built-in overvoltage protection absorbs inductive turn-off energy
• Sensitive gate allows direct drive from microcontrollers
• Improved commutation performance reduces need for snubber circuits

Applications

• Washing machine drum motor control
• Refrigerator compressor control
• Dishwasher pump motor control
• Industrial systems-medium power loads

Procurement Notes

Verify the specific ordering suffix to confirm package type and pinout configuration. Ensure the selected variant matches the required voltage and current ratings for the target application. Cross-reference the manufacturer's official documentation to confirm active status and availability before finalizing procurement plans.

Selection Notes

Select this component for AC switching applications requiring robust transient immunity and simplified circuit design. The integrated clamping device eliminates the need for external snubber networks, reducing bill of materials cost. Verify that the load characteristics remain within the specified commutation limits to ensure reliable operation.

Part Context

This part belongs to the ACST Series of 800 V AC Switches, which expands upon previous generations by increasing the repetitive peak reverse voltage range up to 800 V. The series offers various current ratings and packages, providing designers with flexible options for medium-power AC control tasks in residential and industrial environments.

Replacement Considerations

Direct substitutes may include other parts from the ACST series with compatible voltage and current ratings. Verify pin compatibility and thermal requirements when replacing standard Triacs with this AC Switch to ensure proper integration into existing designs.