ACS120-7ST

Overview

The ACS120-7ST is a single AC line switch from STMicroelectronics, packaged in TO-220AB. It features a repetitive peak off-state voltage (VDRM/VRRM) of 700 V and an RMS on-state current (IT(RMS)) of 2 A at Tc = 115 °C. The device includes avalanche-controlled clamping with a typical voltage (VCL) of 1100 V. Electrical characteristics include a maximum gate triggering current (IGT) of 10 mA, a maximum holding current (IH) of 45 mA, and a critical rate of rise of off-state voltage (dV/dt) of 500 V/µs. Thermal resistance junction-to-case (Rth j-l) is 2.6 °C/W.

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 separates the digital controller from the main switch, eliminating gate kickback.
• Designed for direct interface with microcontrollers using negative gate current triggering.
• Capable of driving low-power high-inductive loads up to 2 A.

Applications

• AC static switching in appliance control systems
• Drive of solenoids, valves, relays, and dispensers
• Control of pumps, fans, and micro-motors
• Defrost heater management

Procurement Notes

Verify the specific package variant against the datasheet ordering information. The 'ST' suffix corresponds to the TO-220AB bulk packaging format. Confirm compliance requirements such as UL94 V0 epoxy ratings and ensure the component meets the specified thermal and electrical limits for the intended application environment.

Selection Notes

Select this component for applications requiring integrated transient protection and simplified gate drive circuits. Ensure the load current does not exceed the 2 A RMS rating at the operating case temperature. Verify that the system can accommodate the negative gate current requirement for triggering and that the 700 V blocking voltage aligns with the line voltage specifications.

Part Context

This part belongs to the ACS™ AC Switch Family built around the ASD™ concept. It is designed to reduce component count by up to 80% compared to traditional solutions. The family includes variants like the DPAK (SB) and TO-220FPAB (SFP) packages, all sharing similar electrical performance profiles for AC line switching.

Replacement Considerations

Direct substitutes within the same family include ACS120-7SB (DPAK) and ACS120-7SFP (TO-220FPAB). Cross-package replacements require verifying pinout compatibility and thermal dissipation capabilities relative to the PCB layout or heatsink constraints.