ACS110-7SN

Overview

The ACS110-7SN is an AC line switch from the ASD family, packaged in SOT-223. It controls loads up to 1 A with a blocking voltage of +/-700V and avalanche-controlled clamping at 1100 V typical. Triggered by negative gate current, it integrates a high-voltage clamp for inductive energy absorption and a gate level shifter driver. Key electrical parameters include IT(RMS) = 1 A, IGT max 10 mA, VGT max 1 V, dV/dt min 500 V/µs, and non-repetitive surge peak current of 8 A at 50 Hz.

Feature Summary

• Integrates a high-voltage clamping structure to absorb inductive turn-off energy without external snubbers or varistors
• Features a gate level shifter driver that isolates the digital controller from the main switch and eliminates gate kickback
• Provides high noise immunity against static dV/dt and complies with IEC 61000-4-5 surge standards
• Allows direct interface with microcontrollers and supports connecting multiple devices on the same cooling pad

Applications

• AC static switching in appliance control systems
• Driving low power high inductive or resistive loads such as relays, valves, solenoids, and dispensers
• Control of pumps, fans, micro-motors, and defrost heaters
• Washing machines, dishwashers, tumble dryers, refrigerators, water heaters, air-conditioning systems, and microwave ovens

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the SOT-223 package configuration when sourcing components. Confirm that the device meets the required thermal resistance specifications for the intended PCB copper surface area. Ensure compatibility with the negative gate triggering logic required by the digital controller interface.

Selection Notes

Select this component for applications requiring integrated overvoltage protection and simplified gate drive circuits. The SOT-223 package is suitable for designs needing common cooling pads for multiple switches. Consider the 1 A RMS current rating and 700 V blocking voltage limits when sizing for specific load requirements.

Part Context

The ACS110-7SN belongs to the STMicroelectronics AC Switch (ACS) family built around the ASD concept. This series provides high-performance switching capabilities for AC line applications. The device combines power switching with protection features, reducing the need for external protective components and simplifying the overall circuit design.

Replacement Considerations

The datasheet lists the DIL-8 package variant as ACS110-7SB2. Verify pinout and thermal characteristics if substituting between packages.

FAQ

How is the ACS110-7SN triggered?

The device is triggered with a negative gate current flowing out of the gate pin G.

What is the function of the internal clamping structure?

It absorbs inductive turn-off energy, allowing the switch to drive inductive loads up to 1 A without additional snubber circuits.

Can multiple ACS110 devices be connected together?

Yes, several ACS110 devices can be connected on the same cooling PCB pad, which serves as the COM pin.