ACS120-7SH

Overview

The STMicroelectronics ACS120-7SB is an AC line switch built on the ASD concept, designed for static switching in appliance control systems. It integrates a high-voltage clamping 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 supports up to 2 A RMS load current with a repetitive peak off-state voltage of +/-700 V. The device features avalanche-controlled operation at a typical clamping voltage of 1100 V, enabling direct microcontroller interfacing without external snubbers or varistors.

Feature Summary

• Integrates a high-voltage clamping structure to absorb inductive turn-off energy
• Includes a gate level shifter driver to separate the digital controller from the main switch
• Triggered by negative gate current flowing out of the gate pin
• Interfaces directly with microcontrollers while eliminating gate kickback

Applications

• AC static switching in appliance control systems
• Drive of low power high inductive loads such as relays, valves, solenoids, and dispensers
• Control of pumps, fans, micro-motors, and defrost heaters

Procurement Notes

Verify package availability against specific ordering suffixes. The DPAK variant is available in tubes or tape and reel formats. Confirm that the selected package matches the thermal requirements of the application, as junction-to-ambient resistance varies significantly between surface mount and through-hole options.

Selection Notes

Select based on required RMS current and thermal management capabilities. The DPAK package offers lower thermal resistance to the tab compared to free-air ambient conditions but requires adequate copper area under the tab for optimal performance. Ensure the gate drive circuit provides sufficient negative current to trigger the switch reliably across the operating temperature range.

Part Context

This component belongs to the ACS AC Switch Family, which utilizes the ASD concept for integrated AC line switching. The family includes variants with different voltage ratings and packages, such as the TO-220FPAB and TO-220AB, allowing designers to choose the appropriate form factor for their specific cooling and mounting needs.

Replacement Considerations

Direct replacements within the same family include the ACS120-7SFP (TO-220FPAB package) and ACS120-7ST (TO-220AB package). These share identical electrical characteristics but differ in physical dimensions and thermal resistance values.