ACST8-8CT

Overview

The ACST8-8CT is an overvoltage protected AC power switch belonging to the ASD technology family. It integrates a Triac structure with a high voltage clamping device for absorbing inductive turn-off energy and withstanding line transients per IEC61000-4-5 standards. The component operates with a repetitive peak off-state voltage of +/- 800V and supports an RMS on-state current of 8A at a case temperature of 90°C. It features high noise immunity with a static dV/dt greater than 750 V/µs and requires no external overvoltage protection.

Feature Summary

• Integrates a Triac structure with a high voltage clamping device to absorb inductive turn-off energy
• Provides high noise immunity against fast transient bursts and static dV/dt
• Eliminates the need for external overvoltage protection components

Applications

• AC static switching in appliance control systems
• Washing machine bi-rotational induction motor drive
• Induction motor drive for refrigerator or freezer compressors

Procurement Notes

Verify the specific package type during procurement, as the ACST8 series includes TO-220FPAB, TO-220AB, and D2PAK variants. Confirm that the ordering suffix matches the required physical footprint for your design. Ensure compliance with UL standards if using insulated packages. Check datasheet revision history for any updates to electrical characteristics before finalizing orders.

Selection Notes

Select this component when driving medium power induction motors up to 8A without requiring external snubber circuits. The device is optimized for applications needing robustness against AC line transients and fast capacitor discharge events. Consider thermal resistance values based on the chosen package and ambient operating conditions to ensure junction temperatures remain within safe limits.

Part Context

The ACST8-8CT belongs to the ACST8 series of AC power switches built around STMicroelectronics' ASD technology. This series is designed for home appliances and industrial systems, offering integrated overvoltage protection. The CT suffix specifically denotes the TO-220AB through-hole package variant within the broader product lineup.

Replacement Considerations

Direct substitutes include other ACST8 series variants such as ACST8-8CFP (TO-220FPAB) or ACST8-8CG (D2PAK), provided the package form factor is compatible with the existing PCB layout and thermal management requirements.