ACST8-8CG-TR

Overview

The ACST8-8CG-TR is an overvoltage protected AC power switch manufactured by STMicroelectronics, belonging to the ASD™ (Application Specific Discrete) technology family. It integrates a Triac structure with a high voltage clamping device designed to absorb inductive turn-off energy and withstand line transients compliant with IEC61000-4-5 standards. The component features a repetitive peak off-state voltage of 800 V and supports an RMS on-state current of 8 A at specified case temperatures. Packaged in D2PAK for surface mount applications, it offers 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 built-in high voltage clamping device to absorb inductive turn-off energy
• Provides high noise immunity against fast transient bursts as per IEC61000-4-4 standards
• Eliminates the need for external overvoltage protection components
• Enables equipment compliance with EN61000-4-5 surge immunity standards

Applications

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

Procurement Notes

Verify the specific ordering suffix '-TR' corresponds to tape and reel packaging containing 500 units, distinct from the tube-packaged 'ACST8-8CG'. Confirm that the gate triggering current specification aligns with the 30 mA maximum value documented in the datasheet electrical characteristics table. Ensure the design accounts for the thermal resistance parameters provided for the D2PAK package under full cycle sine wave conduction conditions.

Selection Notes

Select this component when driving medium power induction loads up to 8 A without requiring external snubber circuits for turn-off commutation. The integrated avalanche control allows direct connection to inductive loads while managing line transients. Verify that the controller interface can supply the necessary negative gate current flow for triggering. Consider the thermal dissipation requirements based on the junction-to-case thermal resistance for the D2PAK footprint.

Part Context

This part belongs to the ACST8 series of overvoltage protected AC switches, which serves as a rugged alternative to conventional Triacs in home appliances and industrial systems. The series utilizes ASD™ technology to embed overvoltage protection directly within the silicon die. The ACST8-8CG variant specifically denotes the D2PAK surface mount package configuration within the broader product lineup that includes TO-220FPAB and TO-220AB options.

Replacement Considerations

Direct substitutes include other ACST8-8C variants such as ACST8-8CT or ACST8-8CFP if package compatibility permits. For equivalent performance in different packages, verify the thermal resistance and pinout alignment. Cross-reference with standard Triacs only if external snubber and clamping circuits are added to replicate the integrated protection features.