ACST1210-7G

Overview

The ACST1210-7G is a single-phase power switch from the ACST12 series, manufactured by STMicroelectronics. It integrates a Triac structure with an overvoltage crowbar technology for robust protection against line transients. The device operates with a maximum on-state current of 12 A and supports blocking voltages up to 1000 V. Designed for surface-mount applications in TO-263 packages, it features low gate trigger current requirements (IGT < 10 mA) and high static dV/dt immunity exceeding 2000 V/μs. This component complies with IEC 61000-4-5 and IEC 61000-4-4 standards, ensuring reliable performance in demanding environments.

Feature Summary

• Integrates Triac structure with overvoltage crowbar technology to absorb inductive turn-off energy and withstand line transients.
• Provides high electrical noise immunity with static dV/dt greater than 2000 V/μs, complying with IEC 61000-4-4 standards.
• Requires low gate current for activation, enabling direct drive from microcontrollers while reducing passive component count.
• Eliminates the need for external overvoltage protection devices through intrinsic ruggedness and planar technology.

Applications

• Home appliances requiring AC switching and load control.
• Industrial systems needing high reliability and transient protection.
• AC-DC power supplies utilizing inrush current limitation circuits.

Procurement Notes

Verify the specific ordering suffix to confirm package type and tape-and-reel specifications. Ensure compatibility with IEC 61000-4-5 surge immunity requirements for your target application. Confirm thermal management solutions align with the TO-263 package dissipation characteristics. Check for RoHS compliance status if required by regional regulations.

Selection Notes

Select this component when designing circuits that demand integrated overvoltage protection without external crowbar diodes. Choose the ACST1210-7G for applications requiring low gate drive current to simplify microcontroller interfacing. Consider its high dV/dt immunity for environments with significant fast transient noise. Evaluate the 12 A current rating against peak load requirements to ensure adequate margin.

Part Context

The ACST1210-7G belongs to the ACS/ACST power switch family built with Application Specific Discrete (A.S.D.) technology. This series combines Triac functionality with high-voltage clamping capabilities. It is designed to replace traditional Triac plus snubber/crowbar combinations, simplifying circuit design and reducing board space requirements for AC load control applications.

Replacement Considerations

Direct replacements include other ACST12 series variants such as ACST1235-7G for higher dV/dt immunity or different voltage ratings. Verify pinout compatibility and thermal resistance values when substituting with generic TRIACs, as external protection components may be required.

FAQ

Does the ACST1210-7G require an external snubber circuit?

No, the device integrates overvoltage crowbar technology and offers high dV/dt immunity, typically eliminating the need for external snubber networks.

What is the maximum static dV/dt immunity of this component?

The ACST1210-7G provides a minimum static dV/dt immunity of 2000 V/μs, ensuring high noise immunity.

Can this device be directly driven by a microcontroller?

Yes, it requires a low gate trigger current (IGT < 10 mA), allowing direct interface with standard microcontroller GPIO pins.