ACST1235-7GTR

Overview

The ACST1235-7GTR is a single-phase triac from the STMicroelectronics ACST series, housed in a TO-263 (D2PAK) surface-mount package. It features an integrated overvoltage protection structure capable of absorbing inductive turn-off energy and withstanding line transients per IEC 61000-4-5 standards. The device supports a maximum RMS on-state current of 12 A and offers high static dV/dt immunity exceeding 2000 V/μs at 150 °C junction temperature. Key electrical parameters include a repetitive peak off-state voltage of 800 V, a non-repetitive peak surge current of 126 A, and a maximum gate trigger current of 35 mA.

Feature Summary

• Integrates a Triac structure with a high-voltage clamping device for self-protection against inductive turn-off energy and line transients.
• Provides extremely high static dV/dt immunity of at least 2 kV/μs to ensure reliable operation under fast transient conditions.
• Designed to comply with IEC 61000-4-4 and IEC 61000-4-5 electromagnetic compatibility standards without requiring external snubber circuits.

Applications

• Solid-state relays
• Industrial motor control systems
• Home appliance power switching

Procurement Notes

Verify the specific suffix 'GTR' against the manufacturer's official datasheet to confirm tape-and-reel packaging and RoHS compliance status. Ensure the selected component matches the required 800 V blocking voltage rating for the target circuit design.

Selection Notes

Select this component when a surface-mount solution is required for 12 A AC loads. The integrated crowbar technology eliminates the need for external overvoltage protection components, reducing passive part count. Verify that the application environment remains within the specified -40 °C to +150 °C operating temperature range.

Part Context

This device belongs to the ACST family built with Application Specific Discrete (A.S.D.) technology. It serves as a robust alternative to traditional discrete triacs by combining switching capabilities with inherent overvoltage protection in a compact D2PAK package suitable for automated assembly.

Replacement Considerations

Direct replacements include the ACST1235-8FP for through-hole applications or other ACST1235 variants with compatible voltage ratings. Verify pinout compatibility and thermal resistance requirements before substituting.

FAQ

Does the ACST1235-7GTR require an external snubber circuit?

No, the device features high static dV/dt immunity and integrated overvoltage protection, allowing it to operate without external snubber networks in most standard applications.

What is the maximum junction temperature for this component?

The maximum operating junction temperature is 150 °C, which allows for high-temperature operation while maintaining specified dV/dt immunity levels.