ACST6-7SFP

Overview

The ACST6-7SFP is an overvoltage protected AC power switch from STMicroelectronics, utilizing Application Specific Discrete (ASD) technology. 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 features a sensitive gate requiring low triggering current (IGT < 10 mA), enabling direct microcontroller interface. Rated for 700 V repetitive peak off-state voltage, it supports RMS currents up to 6 A at case temperatures of 105 °C. Packaged in TO-220FPAB, it offers snubberless commutation and high noise immunity, eliminating the need for external MOVs or RC networks.

Feature Summary

• Integrated high-voltage clamping device absorbs inductive turn-off energy and withstands line transients
• Sensitive gate logic allows direct drive from microcontrollers without level shifting
• Snubberless operation capability reduces external component count and PCB space
• High static dV/dt immunity ensures reliable switching in noisy environments

Applications

• AC static switching in home appliance control systems
• Induction motor drive actuators for refrigerator and freezer compressors
• Spray pump control in dishwashers
• Actuator control for refrigerator or freezer thermostats

Procurement Notes

Verify the specific suffix '7SFP' against official STMicroelectronics documentation to confirm pinout compatibility and thermal characteristics. Ensure the procurement source provides valid datasheets confirming the 700V rating and TO-220FPAB package insulation requirements. Cross-reference the part number with authorized distributors to avoid counterfeit components that may lack the integrated overvoltage protection features.

Selection Notes

Select this component when designing circuits requiring robust transient protection without external MOVs. The 700V rating suits standard residential AC lines. Verify that the load current does not exceed 6A RMS at the maximum expected case temperature of 105°C. Ensure the driving microcontroller can supply the required gate trigger current below 10mA. Consider the insulated TO-220FPAB package if electrical isolation from heatsinks is required by safety standards.

Part Context

The ACST6 series belongs to STMicroelectronics' ASD technology family, designed as rugged alternatives to conventional triacs. These devices embed a triac structure with a high-voltage clamping device to handle inductive loads and line transients. The series spans various current ratings and packages, targeting home appliances and industrial systems where reliability and simplified circuit design are critical.

Replacement Considerations

Direct replacements must match the 700V rating, 6A current capacity, and TO-220FPAB package. Verify that substitute parts also feature sensitive gate logic and integrated overvoltage protection to maintain snubberless operation and EMI immunity.