ACST1010-7T

Overview

The ACST1010-7T is a standard Triac from the ACS™/ACST power switch family, manufactured by STMicroelectronics. It features an integrated overvoltage crowbar protection device designed to absorb inductive turn-off energy and withstand transients compliant with IEC 61000-4-5 standards. The component operates with a maximum on-state RMS current of 10 A and a repetitive peak off-state voltage of 700 V. It utilizes a TO-220AB through-hole package and requires a low gate trigger current (IGT) of up to 10 mA for activation. The device supports a junction temperature range of -40°C to +125°C.

Feature Summary

• Integrates overvoltage crowbar technology to clamp transient voltages and protect against surges without external components.
• Provides high noise immunity with static dV/dt exceeding 2000 V/µs, complying with IEC 61000-4-4 standards.
• Requires low gate triggering current (IGT < 10 mA), allowing direct drive from microcontrollers via simple gate resistors.
• Offers UL certified insulation rated at 1500 VRMS when housed in the insulated TO-220FPAB package variant.

Applications

• AC mains static switching in home appliances and industrial control systems.
• Driving universal motors, such as washing machine drums.
• Controlling compressors for refrigerators or air conditioners.

Procurement Notes

Verify the specific package type required for the application, as the ACST10 series is available in both standard TO-220AB and insulated TO-220FPAB configurations. Confirm that the ordering suffix matches the desired sensitivity level, ensuring the selection aligns with the system's gate drive capabilities and isolation requirements before finalizing procurement.

Selection Notes

Select the ACST1010-7T when the application demands a low gate trigger current to facilitate direct interfacing with logic-level drivers or microcontrollers. This variant is suitable for circuits requiring robust transient suppression and high dV/dt immunity. Ensure the thermal management design accounts for the junction-to-case thermal resistance specified for the chosen package style to maintain operation within the 125°C junction temperature limit.

Part Context

The ACST1010-7T belongs to the ACST10 series, which utilizes Application Specific Discrete (A.S.D.) technology. This family is engineered for medium-power AC load driving, combining Triac functionality with built-in overvoltage protection. The series includes variants with different gate sensitivities, such as the ACST1035-7, to accommodate various control circuit designs.

Replacement Considerations

The ACST1035-7T serves as a functional alternative within the same series, offering a higher gate trigger current threshold of 35 mA while maintaining identical electrical ratings and package options.

FAQ

How does the ACST1010-7T handle overvoltage transients?

It employs an internal overvoltage crowbar technology that clamps low-energy spikes or switches to the on state to dissipate higher energy shocks, recovering its blocking capability after the surge.

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

The device guarantees a minimum static dV/dt immunity of 2000 V/µs at a junction temperature of 125°C.

Can the ACST1010-7T be driven directly by a microcontroller?

Yes, due to its low gate trigger current requirement (IGT < 10 mA), it can be driven directly by an MCU using a simple gate resistor.