ACS108-6SA-TR

Overview

The ACS108-6SA-TR is a logic-level gate AC switch built with A.S.D.® technology, designed for alternating current static switching in appliances and industrial control systems. It features an overvoltage crowbar structure to absorb inductive turn-off energy and a gate level shifter driver to isolate the digital controller from the main switch. Triggered by negative gate current, it controls loads up to 0.8 A with a 600 V blocking capability. The device operates within a junction temperature range of -30°C to +125°C, housed in a TO-92 package.

Feature Summary

• Enables equipment to meet IEC 61000-4-5 surge standards using overvoltage crowbar technology
• Provides high noise immunity against static dV/dt and IEC 61000-4-4 burst events
• Eliminates the need for external protection snubbers or varistors
• Interfaces directly with microcontrollers via logic-level gate characteristics

Applications

• Alternating current on/off static switching in appliances and industrial control systems
• Driving low power high inductive or resistive loads such as relays, valves, solenoids, and dispensers
• Controlling pumps, fans, low power motors, door locks, air flow dumpers, and lamps

Procurement Notes

Verify the specific ordering suffix to confirm the packaging format, as the base part number corresponds to bulk packaging while the -TR suffix indicates tape and reel delivery. Confirm that the component meets RoHS compliance requirements and check for any relevant environmental declarations before finalizing procurement specifications.

Selection Notes

Select this component when direct microcontroller interface is required without additional level shifting circuitry. Ensure the application load does not exceed the 0.8 A RMS rating at the expected lead temperature. Verify that the system can accommodate the negative gate trigger current requirement flowing out of the gate pin for proper activation.

Part Context

This device belongs to the ACS™ series of AC switches manufactured by STMicroelectronics. It utilizes A.S.D.® technology to provide integrated overvoltage protection and high commutation capabilities. The product line targets applications requiring simplified designs with reduced bill of materials by integrating protection functions typically handled by discrete components.

Replacement Considerations

Direct replacements must match the 600 V rating, 0.8 A current capacity, and TO-92 package. Verify that alternative devices support negative gate triggering and offer comparable dV/dt immunity if snubberless operation is required in the design.

FAQ

How is the ACS108-6SA triggered?

The device is triggered by a negative gate current flowing out of the gate pin, allowing it to be driven directly by a digital controller through a resistor.

What is the purpose of the overvoltage crowbar structure?

The overvoltage crowbar structure absorbs inductive turn-off energy and withstands AC mains transients, enabling the device to meet IEC 61000-4-5 surge standards without external protection.

Can this device operate without a snubber circuit?

Yes, the ACS108-6SA is designed to drive small power high inductive loads without requiring an additional turn-off snubber or varistor due to its integrated protection features.