ACST12-7CT

Overview

The ACST12-7CT is a transient protected AC power switch from the ACS/ACST family, utilizing ASD technology. It integrates a Triac structure with an overvoltage crowbar device to absorb inductive turn-off energy and withstand line transients per IEC 61000-4-5. Rated for 12 A RMS on-state current and 700 V repetitive peak off-state voltage, this component features high static dV/dt immunity of 2 kV/µs minimum at 125 °C. Packaged in TO-220AB, it operates within a junction temperature range of -40 to +125 °C.

Feature Summary

• Integrates Triac structure with overvoltage crowbar technology for self-protection against line transients
• Provides extremely high static dV/dt immunity of 2 kV/µs minimum at elevated temperatures
• Designed for low gate triggering current activation compatible with microcontroller interfaces
• Eliminates the need for external overvoltage protection components

Applications

• AC mains static switching in home appliance control systems
• Universal drum motor drive in washing machines
• Compressor drive for refrigerators or air conditioners

Procurement Notes

Verify the specific ordering code ACST12-7CT corresponds to the TO-220AB package configuration. Confirm that the 'C' suffix indicates the high dV/dt sensitivity variant rather than the standard 'S' version. Ensure compliance with RoHS standards as specified by the ECOPACK® lead-free interconnect requirements before finalizing procurement.

Selection Notes

Select this component when driving medium power AC loads up to 12 A requiring robust transient immunity. The high dV/dt rating allows operation without additional snubber circuits for many inductive loads. Verify that the 700 V blocking voltage meets the peak line voltage requirements plus safety margins for the specific application environment.

Part Context

This part belongs to the ACST12 series, which includes variants like ACST12-7ST and ACST12-7CG. The series utilizes Application Specific Discrete (ASD) technology to combine power switching and protection functions. The ACST12-7CT specifically denotes the TO-220AB package version with high dV/dt characteristics.

Replacement Considerations

Direct substitutes include other ACST12 series members such as ACST12-7ST for lower dV/dt requirements or ACST12-7CG for surface mount D²PAK applications. Cross-referencing absolute ratings and thermal characteristics is essential when replacing with non-ST TRIACs.