STMicroelectronics ACS120-7SFP

Overview

ACS120-7SFP from STMicroelectronics is a high-noise-immunity AC line switch in TO-220FPAB package, designed for direct microcontroller-driven static switching of inductive/resistive loads up to 2 A RMS. It features ±700 V blocking voltage, 1100 V avalanche clamping, <10 mA gate trigger current, and integrated gate-level shifter driver. Used in appliance motor and solenoid control where snubber-free turn-off is required.

For engineers reviewing the ACS120-7SFP datasheet, ACS120-7SFP pinout, ACS120-7SFP application, or ACS120-7SFP equivalent, this page delivers verified electrical specs, thermal resistance values, dV/dt immunity, clamping behavior under IEC 61000-4-5 transients, and real-world load interface guidance for washing machines, dishwashers, and HVAC systems.

Technical Context

The ACS120-7SFP implements ST's ASD™ (Advanced Switching Device) architecture with monolithically integrated high-voltage clamping diode and gate-level shifter. Its negative-gate-trigger operation enables direct MCU connection without optocouplers or level-shifting circuitry.

It sustains 2 kV non-repetitive line pulse voltage per IEC 61000-4-5 while dissipating up to 10 mJ inductive turn-off energy via on-chip avalanche structure. Thermal resistance is 60 °C/W (junction-to-tab), enabling 2 A RMS conduction at Tc = 115 °C without external heatsink in many applications.

Key Specifications

Pinout & Package

ACS120-7SFP uses TO-220FPAB package (isolated tab, 3-pin vertical mount) with 60 °C/W junction-to-tab thermal resistance. Tab is electrically isolated and thermally connected to internal die substrate.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar AC line switching applications.

Compared with ACS120-7ST, the -7SFP offers safer isolation for floating PCB layouts; compared with ACS108-7SFP, it delivers 2.5× higher RMS current and 22% higher clamping voltage-critical for defrost heaters and pump motors.

Availability

ACS120-7SFP is available at Aetrix Electronics and suitable for washing machine valve control, dishwasher solenoid actuation, refrigerator defrost heating, and HVAC fan switching requiring stable component supply across multi-year appliance production cycles.

Supply support for ACS120-7SFP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The ACS™ AC line switch product line targets appliance manufacturers needing robust, snubberless, microcontroller-compatible AC switching - specifically engineered to replace electromechanical relays in white goods and HVAC systems.

FAQ

What is the recommended gate drive circuit for ACS120-7SFP?

Drive the G pin with a standard MCU GPIO configured as open-drain or push-pull sinking current. Use a series resistor (typically 140 Ω) between GPIO and G to limit IGT to <10 mA at 12 V logic. No pull-up or external voltage source is needed - the device triggers on negative current flow out of G.

Can ACS120-7SFP replace a mechanical relay in a 2 A, 230 VAC solenoid application?

Yes - it is qualified for direct replacement in solenoid, valve, and micro-motor loads up to 2 A RMS. Its 500 V/µs dV/dt immunity and integrated 1100 V clamping eliminate relay contact wear and EMI issues, and it meets IEC 61000-4-5 surge requirements without external protection.

Does ACS120-7SFP require a heatsink for 2 A continuous operation?

No external heatsink is required if the tab is mounted to ≥0.5 cm² copper area on FR4 PCB with natural convection. At Tc = 115 °C, it sustains 2 A RMS; derating applies only above that case temperature. Thermal resistance is 60 °C/W junction-to-tab, not junction-to-ambient.

How does ACS120-7SFP handle inductive turn-off energy without a snubber?

It uses an integrated avalanche diode structure that clamps VOUT to ~1100 V during turn-off, linearly dissipating stored inductive energy (up to 10 mJ) within the silicon. This eliminates external snubbers while maintaining safe SOA - validated per IEC 61000-4-5 with 2 kV surges on 10 H inductive loads.