ACST2-8SB-TR

Overview

The ACST2-8SB-TR is an overvoltage protected AC switch from the ACS/ACST family, manufactured by STMicroelectronics. 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. Rated for an on-state RMS current of 2 A and a repetitive peak off-state voltage of 800 V, it features a sensitive gate requiring a maximum trigger current of 10 mA and a maximum trigger voltage of 1.1 V. The component operates within a junction temperature range of -40°C to +125°C and is housed in a DPAK surface-mount package.

Feature Summary

• Integrates overvoltage crowbar technology to clamp transient voltages and absorb inductive turn-off energy without external protection components.
• Provides high electrical noise immunity with a static dV/dt rating exceeding 500 V/µs at 125°C, ensuring reliability against fast transients defined in IEC 61000-4-4.
• Features a logic-level sensitive gate that allows direct interface with microcontrollers using minimal gate drive current.

Applications

• AC on/off static switching in home appliances and industrial control systems
• Driving low power highly inductive loads such as solenoids, pumps, fans, and micro-motors
• General purpose AC switching where high commutation capability and robustness are required

Procurement Notes

Verify the specific ordering code ACST210-8B-TR matches the required DPAK tape and reel packaging configuration. Confirm that the 800 V blocking voltage and 2 A current ratings align with the system's electrical requirements. Ensure compliance with environmental directives such as RoHS if applicable to the final assembly process.

Selection Notes

Select this component for applications requiring direct microcontroller interfacing due to its low gate trigger current. The integrated overvoltage protection eliminates the need for external MOVs or snubber circuits, reducing bill of materials complexity. Verify thermal management capabilities based on the specific copper surface area under the tab for adequate heat dissipation during continuous operation.

Part Context

This device belongs to the ACST series of overvoltage protected AC switches built with Application Specific Discrete (A.S.D.) technology. It serves as a rugged alternative to conventional Triacs, offering enhanced reliability and simplified circuit designs for appliance actuators and industrial loads up to 2 A.

Replacement Considerations

The ACST210-8B is the tube version of this component. Other members of the ACST family offer higher current ratings but may require different thermal management strategies.