ACST2-8SFP

Overview

The ACST2-8SFP is an overvoltage protected AC switch from the ACS/ACST power switch family, designed for home appliances and industrial systems. It integrates a Triac structure with a high voltage clamping device to absorb inductive turn-off energy and withstand line transients per IEC 61000-4-5 standards. The device drives loads up to 2 A RMS at 800 V blocking voltage. It features low gate current activation (IGT max 10 mA) and high electrical noise immunity (static dV/dt min 500 V/µs). Available in TO-220FPAB packages, it provides insulation voltages rated at 1500 V rms.

Feature Summary

• Integrates Triac structure with overvoltage crowbar technology for self-protection against surge voltages
• Provides high electrical noise immunity compliant with fast transient burst test standards
• Enables direct interface with microcontrollers due to low gate trigger current requirements
• Eliminates the need for external overvoltage protection components

Applications

• AC on/off static switching in home appliances
• Control of low power highly inductive loads such as solenoids, pumps, fans, and micro-motors
• Industrial control systems requiring robust switching capabilities

Procurement Notes

Verify the specific package configuration when ordering, as the suffix indicates the physical form factor. Confirm that the selected variant meets the required thermal dissipation characteristics for the intended application environment. Ensure compatibility with standard lead-free soldering processes specified for ECOPACK compliant components.

Selection Notes

Select this component for applications requiring integrated overvoltage protection without additional snubber circuits. Consider the thermal resistance values when designing heat sinking solutions, particularly for continuous operation near maximum current ratings. Verify that the load inductance does not exceed the device's non-repetitive surge current capabilities during turn-off events.

Part Context

This device belongs to the STMicroelectronics ACST series of rugged AC switches. It serves as an alternative to conventional Triacs by embedding high voltage clamping capabilities. The series spans various current ratings and packaging options, targeting appliance and industrial markets where reliability against line transients is critical.

Replacement Considerations

Standard Triacs lack the integrated overvoltage clamping feature and may require external protection components. When replacing standard Triacs, verify that the circuit layout supports the lower gate drive requirements and that the thermal management accounts for the specific junction-to-case resistance of the new package.