ACST410-8B

Overview

The ACST410-8B is a bidirectional triac switch from STMicroelectronics, designed for surface-mount applications in the TO-252 package. It features an RMS on-state current rating of 4 A and a repetitive peak off-state voltage of 800 V. The device supports a surge current capacity of 32 A and operates within a temperature range of -40°C to +125°C. Key electrical parameters include a maximum gate trigger current of 10 mA, a maximum gate trigger voltage of 1 V, and a peak on-state voltage of 1.7 V. The component maintains a holding current of 20 mA and exhibits a repetitive peak off-state leakage current of 0.5 mA.

Feature Summary

• Integrated high-voltage clamp circuitry to absorb inductive turn-off energy and withstand line transients per IEC 61000-4-5 standards.
• Logic-level gate sensitivity enabling direct microcontroller drive with low gate trigger current requirements.
• High immunity to electrical noise, complying with IEC 61000-4-4 fast transient burst test standards.

Applications

• General-purpose AC switching in household appliances
• Industrial system load control
• Phase-angle control circuits

Procurement Notes

Verify the specific ordering suffix against official STMicroelectronics documentation to confirm exact pinout and thermal characteristics. Ensure the selected variant matches the required voltage and current ratings for the target application. Cross-reference datasheet revisions to confirm compliance with current environmental directives such as RoHS. Confirm package dimensions match PCB footprint requirements before finalizing procurement.

Selection Notes

Select this component when a surface-mount solution is required for 4 A AC loads with integrated overvoltage protection. The logic-level gate drive simplifies interface design with standard microcontrollers. Consider the TO-252 package thermal performance for continuous operation at elevated ambient temperatures. Verify that the 800 V blocking voltage exceeds the peak line voltage plus transient spikes in the specific application environment.

Part Context

This device belongs to the ACS/ACST power switch series utilizing ASD technology. It is part of a broader family of triacs ranging from lower current ratings like the ACST210-8B to higher current variants. The series is characterized by embedded clamping capabilities and compatibility with automated surface-mount manufacturing processes.

Replacement Considerations

Direct functional substitutes within the same series include the ACST310-8B (3 A) or ACST6 (6 A), provided voltage ratings and package types are compatible. Verify that any replacement maintains the 800 V blocking voltage and TO-252 form factor. Check gate trigger specifications to ensure MCU compatibility.