ACST12-7CG-TR

Overview

The ACST12-7CG-TR is a transient protected AC power switch manufactured by STMicroelectronics, 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 standards. This specific variant features a sensitive gate (IGT < 10 mA) for direct microcontroller drive and offers high static dV/dt immunity of at least 2000 V/µs. The component operates with a maximum on-state RMS current of 12 A and a repetitive peak off-state voltage of 700 V. It is housed in a D²PAK package.

Feature Summary

• Integrates Triac structure with overvoltage crowbar technology for self-protection against surge voltages
• Provides extremely high static dV/dt immunity of 2 kV/µs minimum
• Features low gate triggering current allowing direct drive from microcontrollers
• Eliminates the need for external overvoltage protection components

Applications

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

Procurement Notes

Verify the ordering code matches ACST12-7CG-TR to ensure correct sensitivity and packaging. Confirm the D²PAK package type aligns with PCB footprint requirements. Check datasheet specifications for thermal management needs under full load conditions. Ensure compliance with environmental directives such as RoHS if applicable to the final assembly.

Selection Notes

Select this component when high noise immunity and transient protection are required without external snubbers. The 7C suffix indicates high dV/dt immunity suitable for noisy environments. The 7S variant offers lower gate current but reduced dV/dt immunity. Choose based on the specific trade-off between gate drive simplicity and commutation robustness.

Part Context

This part belongs to the ACST12 series within the ACS/ACST family built on ASD technology. It serves as a rugged alternative to conventional TRIACs for home appliances and industrial systems. The series spans various current ratings and packages, offering integrated protection features that simplify circuit design and reduce passive component counts.

Replacement Considerations

Direct replacements include other ACST12 variants like ACST12-7SG-TR for different sensitivities. Standard TRIACs may require additional external protection circuits to match the transient performance. Verify pinout compatibility and thermal characteristics when substituting with devices from other manufacturers.