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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACS120-7SB-TR

Name: ACS120-7SB-TR
Brand: STMicroelectronics
SKU: ACS120-7SB-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ACS120-7SB-TR

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: ACS120-7SB-TR.pdf

Description:: TRIAC SENS GATE 700V 2A DPAK

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Product details

Overview

ACS120-7SB-TR from STMicroelectronics is a DPAK-packaged AC line switch designed for solid-state replacement of electromechanical relays in appliance control systems. It provides bidirectional 700 V blocking voltage (VDRM/VRRM), 2 A RMS on-state current, and integrated avalanche clamping (VCL = 1100 V) to safely commutate inductive loads such as solenoids and defrost heaters without external snubbers.

For engineers reviewing the ACS120-7SB-TR datasheet, ACS120-7SB-TR pinout, ACS120-7SB-TR application, or ACS120-7SB-TR equivalent, this device offers direct microcontroller interface via negative gate triggering, high noise immunity (dV/dt > 500 V/µs), and IEC 61000-4-5 surge compliance up to 2 kV - critical for white goods and HVAC load switching.

Technical Context

The ACS120-7SB-TR implements ST's ASD™ architecture: an integrated high-voltage thyristor with monolithically embedded gate driver, level shifter, and avalanche energy-absorbing clamp diode. Its negative gate trigger current (IGT < 10 mA) flows *out* of the G pin, enabling direct connection to MCU GPIO through a series resistor.

It operates in quadrants II and III only, sustaining turn-off energy up to ~10 mJ via controlled clamping at VCL ≈ 1100 V. Thermal performance is defined by Rth(j-l) = 2.6 °C/W (junction-to-tab) and Rth(j-a) = 70 °C/W (junction-to-ambient, S = 0.5 cm²), supporting conduction at Tc = 115 °C with no heatsink required for 2 A RMS.

Key Specifications

Parameter	Value and Actual Design Meaning
VDRM / VRRM	±700 V - blocks full-cycle AC mains (230 VAC + transients) without breakdown
IT(RMS)	2 A at Tc = 115 °C - supports continuous resistive/inductive loads like pumps and fans
VCL	1100 V typ - clamps inductive turn-off voltage spikes, eliminating need for external MOV/snubber
IGT	< 10 mA - low gate drive requirement enables direct interface with 3.3 V/5 V MCUs
dV/dt	> 500 V/µs - immune to fast line transients and EMI in noisy appliance environments
Rd	200 mΩ max at Tj = 125 °C - ensures low conduction loss (~0.8 W at 2 A) and thermal stability
VPP	2 kV per IEC 61000-4-5 - withstands surge events on both polarities without failure

Pinout & Package

DPAK (TO-252) package: surface-mount, single-tab thermally enhanced outline with 3 terminals. Tab is electrically connected to COM pin and serves as primary heat path.

Pin/Terminal	Circuit Role	Design Meaning
COM	Common reference terminal	Connected to AC neutral or return path; tab is internally bonded to COM for thermal and electrical continuity
G	Gate input	Receives negative-triggering current (flowing out); requires no pull-up; interfaces directly with MCU GPIO
OUT	Switch output	Connected to load; handles full AC line voltage and current; bidirectional conduction path

Key Features

Feature	Design Value
Integrated avalanche clamping	Monolithic 1100 V clamp absorbs inductive turn-off energy - eliminates external snubber components
Negative gate trigger logic	IGT flows out of G pin - simplifies drive circuitry and prevents gate kickback to MCU
Direct microcontroller interface	No level shifter or optocoupler needed - reduces BOM count by up to 80% vs relay-based designs
IEC 61000-4-5 compliance	Withstands 2 kV line-to-line surges on resistive and inductive loads - meets appliance safety standards
Multi-device thermal sharing	Multiple ACS120-7SB-TR units can share a single copper cooling pad - simplifies thermal layout in multi-load systems

Applications

Washing Machine Control

Dishwasher Solenoid Drive

Use Scenario: Switching water inlet valves and drain pumps during cycle phases.

IC Role / Device Role / Timing Role: AC line switch replacing mechanical relay; triggered synchronously with zero-crossing detection for EMI reduction.

Use Value: Eliminates contact wear, bounce, and arcing - extends system lifetime beyond 100,000 cycles.

Use Scenario: Controlling detergent dispenser solenoids and heating element relays.

IC Role / Device Role / Timing Role: Bidirectional AC switch handling inductive loads up to 2 A RMS with built-in clamping.

Use Value: Removes need for external flyback diodes or RC snubbers - reduces PCB area by ≥30%.

Refrigerator Defrost Heater

Air-Conditioning Fan Motor

Use Scenario: Cycling 230 VAC defrost heater elements during compressor off-periods.

IC Role / Device Role / Timing Role: High-noise-immunity AC switch operating in thermally constrained evaporator compartments.

Use Value: Withstands ambient temperatures up to +125 °C junction and 500 V/µs dV/dt - ensures reliability in sealed enclosures.

Use Scenario: Speed-controlled fan motor switching in indoor unit blower circuits.

IC Role / Device Role / Timing Role: Solid-state alternative to triac-based dimming, enabling precise phase-angle control.

Use Value: Delivers stable 2 A RMS conduction with Rd ≤ 200 mΩ - minimizes self-heating under continuous duty.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACS108-7SB-TR	Lower IT(RMS) = 1.2 A; same VDRM = 700 V; reduced I²t rating (1.1 A²s)	Suitable only for sub-1.2 A loads (e.g., small solenoids); insufficient for 2 A pumps/fans	Select when thermal budget is tighter and load current is consistently ≤1.2 A RMS.
ACS120-7SFP	Same electrical specs but TO-220FPAB package; Rth(j-l) = 3.5 °C/W; higher weight (2.4 g)	Requires through-hole mounting and larger board area; better suited for prototyping or low-volume assemblies	Choose for manual assembly, legacy footprint compatibility, or where DPAK reflow is unavailable.

Compared with ACS108-7SB-TR, the ACS120-7SB-TR delivers 67% higher RMS current capability and 100% higher I²t robustness; versus ACS120-7SFP, it offers 29% lower thermal resistance to tab and 90% smaller footprint - making it optimal for high-density, high-volume appliance PCBs.

Availability

ACS120-7SB-TR is available at Aetrix Electronics and suitable for washing machine control, dishwasher solenoid drive, and refrigerator defrost heater applications requiring stable component supply across multi-year production cycles.

Supply support for ACS120-7SB-TR 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, specializing in power management, analog, and automotive-grade ICs with over 45 years of industrial reliability heritage.

The ACS™ AC line switch product line was engineered specifically for solid-state replacement of electromechanical relays in white goods and HVAC systems - prioritizing surge ruggedness, thermal efficiency, and MCU interoperability.

FAQ

What is the correct gate drive configuration for ACS120-7SB-TR?

The ACS120-7SB-TR requires a negative gate trigger: current must flow *out* of the G pin into the driving source (e.g., MCU GPIO pulled low). A series resistor (typically 140 Ω for 12 V drive) limits IGT to <10 mA. No pull-up or external bias is needed - the device latches on until current falls below IH (≤45 mA).

Can ACS120-7SB-TR replace a mechanical relay in a 230 VAC, 2 A resistive load?

Yes - it supports 2 A RMS at Tc = 115 °C with VDRM = ±700 V, exceeding 230 VAC peak (325 V) by >2x margin. Its 2 kV IEC 61000-4-5 rating and 500 V/µs dV/dt immunity ensure reliable operation without contact wear, bounce, or arcing - validated in washing machine and cooker applications.

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

No heatsink is required when mounted on ≥0.5 cm² copper area: Rth(j-a) = 70 °C/W and Rth(j-l) = 2.6 °C/W enable safe operation at Tc = 115 °C. At 2 A RMS and Rd = 200 mΩ, power dissipation is ~0.8 W, resulting in ΔT ≈ 56 °C above ambient - well within the -30 °C to +125 °C junction range.

How does the integrated clamping structure protect against inductive kickback?

During turn-off, load inductance forces current through the internal avalanche diode, clamping OUT–COM voltage to VCL ≈ 1100 V. This dissipates stored energy (up to ~10 mJ) safely within the die, eliminating external snubbers. Clamping occurs only during commutation - not during normal conduction - preserving efficiency.

ACS120-7SB-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ASD™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 700 V

Current - On State (It (RMS)) (Max):: 2 A

Voltage - Gate Trigger (Vgt) (Max):: 1 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 20A, 11A

Current - Gate Trigger (Igt) (Max):: 10 mA

Current - Hold (Ih) (Max):: 45 mA

Configuration:: Single

Operating Temperature:: -30°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

ACS120-7SB-TR FAQ

1.How can I place an order for ACS120-7SB-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for ACS120-7SB-TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ACS120-7SB-TR reliable?

The price and inventory of ACS120-7SB-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACS120-7SB-TR is usually 5 days.

3.What payment methods are accepted for ACS120-7SB-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS120-7SB-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ACS120-7SB-TR?

ACS120-7SB-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ACS120-7SB-TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ACS120-7SB-TR?

For technical support, including ACS120-7SB-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS120-7SB-TR requirements.

6.How does Aetrix verify that ACS120-7SB-TR is sourced from the original manufacturer or authorized distributors?

All ACS120-7SB-TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ACS120-7SB-TR meets industry standards.

7.What is the process for return or replacement of ACS120-7SB-TR?

All ACS120-7SB-TR units undergo pre-shipment inspection (PSI). If there is an issue with ACS120-7SB-TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ACS120-7SB-TR part is unused and in its original packaging.

Return procedure for ACS120-7SB-TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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