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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACST6-7SG-TR

Name: ACST6-7SG-TR
Brand: STMicroelectronics
SKU: ACST6-7SG-TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ACST6-7SG-TR

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: ACST6-7SG-TR.pdf

Description:: TRIAC SENS GATE 700V 6A D2PAK

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Product details

Overview

ACST6-7SG-TR from STMicroelectronics is an overvoltage-protected AC switch (integrated triac + clamping device) in TO-220FPAB insulated package, rated 6 A RMS, 800 V blocking voltage, with gate trigger current < 10 mA and 1500 V_RMS insulation. It enables IEC 61000-4-5-compliant AC mains static switching without external snubbers or TVS, used in washing machine drum motor and refrigerator compressor control.

For engineers reviewing the ACST6-7SG-TR datasheet, ACST6-7SG-TR pinout, ACST6-7SG-TR application, or ACST6-7SG-TR equivalent, this device delivers self-protected AC switching for medium-power inductive loads, direct MCU gate drive capability, and validated immunity to fast transients (IEC 61000-4-4) and surge events (IEC 61000-4-5).

Technical Context

The ACST6-7SG-TR integrates a planar triac structure with an on-die high-voltage crowbar clamping circuit that activates at ≥850 V (V_CL) to safely absorb inductive turn-off energy and line transients. Its gate-triggering threshold remains stable across –40 °C to +125 °C junction temperature, with I_GT ≤ 10 mA and V_GT ≤ 1.0 V under standard test conditions.

It operates in all four quadrants (I, II, III, IV), supports full-cycle conduction up to 6 A RMS at T_c = 92 °C, and exhibits dV/dt immunity ≥500 V/µs (at 125 °C, gate open) and critical dI/dt rating of 100 A/µs - enabling robust commutation without external snubbers in inductive load applications.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	6 A - Sustains continuous AC load current up to 6 A RMS with case temperature ≤ 92 °C in TO-220FPAB package.
VDRM / VRRM	800 V - Blocks 800 V peak AC line voltage in both directions, meeting global mains requirements (230 VAC + margin).
IGT	< 10 mA - Enables direct drive from low-power MCUs via simple series gate resistor, eliminating buffer stages.
VCL (Clamping Voltage)	≥850 V - Activates internal crowbar protection before destructive overvoltage occurs, absorbing transient energy.
VINS(RMS)	1500 V - Provides reinforced insulation between main terminals and heatsink-mounting tab, enabling safe isolation in Class I appliances.
dV/dt Immunity	≥500 V/µs - Prevents false triggering from fast line-edge noise or EMI without requiring gate snubbers.
Rd (Dynamic Resistance)	≤80 mΩ - Limits conduction loss to <1.7 V at 8.5 A, reducing thermal stress and improving efficiency in 6 A loads.

Pinout & Package

ACST6-7SG-TR uses the TO-220FPAB package: insulated plastic body with metal tab (electrically isolated), 1500 V_RMS isolation rating, and screw-mount compatible footprint (recommended torque: 0.4–0.6 N·m). The tab serves as the COM terminal and provides primary thermal path to heatsink.

Pin/Terminal	Circuit Role	Design Meaning
COM (Tab)	Common reference / return path	Electrically isolated metal tab; connects to load neutral or system ground reference; primary thermal interface.
OUT	Main output / load connection	Carries full load current (6 A RMS); bidirectional conduction path; referenced to COM for voltage blocking.
G	Gate control input	Low-current trigger input (≤10 mA); controls turn-on in all quadrants; referenced to COM for logic-level compatibility.

Key Features

Feature	Design Value
Integrated overvoltage protection	On-die crowbar clamping (V_CL ≥ 850 V) eliminates need for external MOVs or TVS diodes in IEC 61000-4-5 compliance designs.
Planar triac technology	Ensures high off-state reliability and stable dV/dt immunity (≥500 V/µs) across temperature, reducing false-trigger risk.
TO-220FPAB insulation	1500 V_RMS isolation enables safe mounting on grounded heatsinks without insulating washers in Class I appliance designs.
Low I_GT & high noise immunity	I_GT ≤ 10 mA and IEC 61000-4-4 compliance allow direct MCU GPIO drive with minimal external components.
No external snubber required	Robust commutation performance (dI/dt = 100 A/µs) supports zero-crossing or phase-angle control of inductive loads like universal motors without RC snubbers.

Applications

Washing Machine Drum Motor Control

Refrigerator Compressor Start/Run

Use Scenario: Precise speed and direction control of universal motor driving washing machine drum during spin and rinse cycles.

IC Role / Device Role / Timing Role: AC mains static switch replacing mechanical relays; handles 6 A inductive load with phase-angle or zero-crossing firing.

Use Value: Eliminates relay wear-out and contact arcing; enables silent, programmable motor control with no external snubber or overvoltage protection.

Use Scenario: Reliable start-up and run control of hermetic compressor in domestic refrigerators and air conditioners.

IC Role / Device Role / Timing Role: High-reliability AC switch managing inrush current (up to 45 A surge) and steady-state 4–6 A operation.

Use Value: Withstands compressor turn-off inductive spikes without snubber; meets IEC 61000-4-5 surge immunity for global safety certification.

Industrial AC Solenoid Valve Control

Smart Appliance Mains Interface Module

Use Scenario: On/off control of 240 VAC solenoid valves in HVAC or fluid control systems with frequent cycling.

IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical contactors; handles repetitive 6 A resistive/inductive switching.

Use Value: Extends service life beyond 100,000 cycles; reduces EMI generation vs. relay bounce; simplifies PCB layout with integrated protection.

Use Scenario: Centralized AC mains switching node in smart ovens, dishwashers, or laundry centers with MCU-based power management.

IC Role / Device Role / Timing Role: Isolated, certified AC switch providing BOM consolidation for multiple load zones (heating, motor, pump).

Use Value: Reduces passive component count by ≥3 parts per channel (no MOV, snubber, isolation transformer); accelerates IEC/UL certification.

Equivalent & Alternatives

The following parts are listed as comparable options for similar overvoltage-protected AC switch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACS108-7SN	Lower IT(RMS) = 1.2 A; same 800 V VDRM; TO-92 package; no isolation.	Suitable only for signal-level or low-power AC loads (<1.2 A); cannot replace ACST6-7SG-TR in 6 A motor/compressor roles.	Select when space-constrained, low-current, non-isolated switching is needed - not a drop-in replacement.
ACST12-7SG-TR	Higher IT(RMS) = 12 A; identical TO-220FPAB package, 800 V, 1500 V_RMS insulation, and crowbar protection.	Supports heavier loads (e.g., larger compressors, dual-motor systems); higher thermal mass requires derating analysis at same heatsink.	Choose for future-proofing or higher-load headroom; shares footprint and drive interface but requires updated thermal design.

Compared with ACS108-7SN and ACST12-7SG-TR, ACST6-7SG-TR uniquely balances 6 A load capacity, reinforced insulation, and compact TO-220FPAB form factor - making it optimal for mid-power home appliance motor control where size, safety, and snubber-free operation are jointly critical.

Availability

ACST6-7SG-TR is available at Aetrix Electronics and suitable for washing machine drum motor control, refrigerator compressor drive, and industrial AC solenoid valve switching requiring stable component supply, long-term lifecycle support, and certified overvoltage protection.

Supply support for ACST6-7SG-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, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.

ACST6-7SG-TR belongs to ST's ACS™/ACST family of Application-Specific Discrete (A.S.D.®) power switches - engineered specifically for snubberless, self-protected AC mains control in cost-sensitive, safety-certified home appliances.

FAQ

What is the maximum allowable case temperature for continuous 6 A RMS operation?

The ACST6-7SG-TR sustains 6 A RMS continuous conduction at a maximum case temperature (T_c) of 92 °C when mounted in TO-220FPAB configuration. Exceeding this requires derating per Figure 3 in the datasheet; thermal resistance from junction to case is 4.25 °C/W, so proper heatsinking is essential to maintain T_j ≤ 125 °C under full load.

Does ACST6-7SG-TR require a heat sink in typical appliance applications?

Yes - a heatsink is mandatory. At 6 A RMS and 1.4 V on-state drop, power dissipation exceeds 8.4 W. With R_th(j-c) = 4.25 °C/W and max T_j = 125 °C, even at T_c = 92 °C, junction temperature would exceed limits without thermal management. ST recommends mounting on ≥25 cm² copper area or an extruded aluminum heatsink.

Can ACST6-7SG-TR be used in zero-crossing switch mode with an optocoupler driver?

Yes - its low I_GT (<10 mA) and high dV/dt immunity (≥500 V/µs) make it compatible with standard zero-crossing optocouplers (e.g., MOC3041, IL420). Gate drive must respect PG(AV) = 0.1 W and PGM = 10 W limits; a 330 Ω series resistor is typical for 5 V MCU or optocoupler output.

How does the internal crowbar protection activate during a 2 kV surge event?

During an IEC 61000-4-5 2 kV surge, the internal clamping structure triggers when voltage across OUT–COM reaches ≥850 V, folding the device into low-impedance conduction for <10 ms. Energy is safely dissipated through the load, then the device recovers blocking capability after the next zero-current crossing - verified for ≥10 polarity-switched surges.

ACST6-7SG-TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 700 V

Current - On State (It (RMS)) (Max):: 6 A

Voltage - Gate Trigger (Vgt) (Max):: 1.5 V

Current - Non Rep. Surge 50, 60Hz (Itsm):: 45A, 50A

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

Current - Hold (Ih) (Max):: 25 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

ACST6-7SG-TR FAQ

1.How can I place an order for ACST6-7SG-TR through Aetrix?

Please submit a Request for Quotation (RFQ) for ACST6-7SG-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 ACST6-7SG-TR reliable?

The price and inventory of ACST6-7SG-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST6-7SG-TR is usually 5 days.

3.What payment methods are accepted for ACST6-7SG-TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST6-7SG-TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ACST6-7SG-TR?

ACST6-7SG-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ACST6-7SG-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 ACST6-7SG-TR?

For technical support, including ACST6-7SG-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST6-7SG-TR requirements.

6.How does Aetrix verify that ACST6-7SG-TR is sourced from the original manufacturer or authorized distributors?

All ACST6-7SG-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 ACST6-7SG-TR meets industry standards.

7.What is the process for return or replacement of ACST6-7SG-TR?

All ACST6-7SG-TR units undergo pre-shipment inspection (PSI). If there is an issue with ACST6-7SG-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 ACST6-7SG-TR part is unused and in its original packaging.

Return procedure for ACST6-7SG-TR:

1.Submit a request within 90 days.

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

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