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STMicroelectronics ACST6-7SG
- Part No.:
- ACST6-7SG
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST6-7SG.pdf
- Description:
- TRIAC SENS GATE 700V 6A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:454
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Product details
Overview
ACST6-7SG from STMicroelectronics is an overvoltage-protected AC switch (integrated triac + clamping device) designed for mains-connected static switching in home appliances and industrial controls. It delivers 6 A RMS on-state current, 800 V blocking voltage (VDRM/VRRM), <10 mA gate trigger current (IGT), and integrated 1500 VRMS insulation in TO-220FPAB package - enabling direct MCU drive and eliminating external snubbers for inductive loads like washing machine drum motors.
For engineers reviewing the ACST6-7SG datasheet, ACST6-7SG pinout, ACST6-7SG application, or ACST6-7SG equivalent, this device serves as a self-protected, high-noise-immunity AC power switch compliant with IEC 61000-4-4 (fast transients) and IEC 61000-4-5 (surge), with verified clamping voltage ≥850 V and dV/dt immunity ≥500 V/µs at 125 °C.
Technical Context
The ACST6-7SG integrates a planar triac structure with an on-die high-voltage crowbar clamping device that activates during line transients - either clamping low-energy spikes or latching into conduction (<10 ms) to safely dissipate high-energy surges up to 2 kV per IEC 61000-4-5. Its gate-triggering threshold remains stable across -40 to +125 °C (IGT ≤10 mA, VGT ≤1.0 V).
It operates in all four quadrants with guaranteed holding current ≤25 mA and latching current ≤40 mA at 25 °C, while sustaining critical dI/dt ≥100 A/µs and off-state dV/dt ≥500 V/µs at junction temperature up to 125 °C - ensuring robust commutation for universal motors and compressors without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 6 A - Sustains continuous 6 A RMS load current (e.g., compressor startup inverter output or drum motor winding) without heatsink derating at Tc = 92 °C. |
| VDRM/VRRM | 800 V - Blocks 800 V peak AC line voltage (e.g., 230 VRMS mains with 1.5× safety margin), preventing false turn-on during voltage transients. |
| IGT | <10 mA - Enables direct drive from low-power MCU GPIO via single series resistor (no buffer stage required), reducing BOM count and PCB area. |
| VCL | ≥850 V - Clamps transient overvoltages above 850 V (e.g., inductive kickback from motor turn-off), protecting downstream circuitry without external MOVs or TVS diodes. |
| dV/dt | ≥500 V/µs - Resists false triggering from fast-rising noise (e.g., EMI from adjacent switching circuits), meeting IEC 61000-4-4 burst immunity requirements. |
| Rth(j-c) | 4.25 °C/W - Low thermal resistance from junction to case enables efficient heat transfer to heatsink, supporting 6 A operation with minimal thermal margin loss. |
| VINS(RMS) | 1500 VRMS - Provides reinforced insulation between main terminals and heatsink-mounting tab, satisfying creepage/clearance requirements for Class I appliances. |
Pinout & Package
ACST6-7SG uses the TO-220FPAB insulated package: epoxy-insulated plastic housing with metal tab electrically isolated (1500 VRMS isolation), 3-pin configuration, and screw-mount mechanical interface (recommended torque: 0.4–0.6 N·m).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Low-current control input (IGT <10 mA); referenced to COM; triggers conduction in all four quadrants. |
| OUT | Main Output Terminal (Anode 2) | Carries full load current (6 A RMS); connected to AC load (e.g., motor winding); voltage polarity reverses each half-cycle. |
| COM | Common Terminal (Anode 1 / MT1) | Reference terminal for gate drive and load return path; forms main current path with OUT; electrically tied to insulated tab in TO-220FPAB. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage protection | On-die crowbar clamping (VCL ≥850 V) eliminates need for external MOVs or snubbers in IEC 61000-4-5-compliant designs. |
| High noise immunity | Guaranteed dV/dt ≥500 V/µs and IEC 61000-4-4 compliance enable reliable operation in noisy appliance environments (e.g., near compressor drivers). |
| Direct MCU drivability | IGT <10 mA allows single-resistor interface to 3.3 V/5 V microcontrollers - no level-shifting or driver IC required. |
| Planar triac technology | Ensures high off-state reliability and stable parameter drift over temperature (-40 to +125 °C junction range). |
| Insulated package | TO-220FPAB provides 1500 VRMS isolation between terminals and heatsink, simplifying safety certification for Class I appliances. |
Applications
| Washing Machine Drum Motor Control | Refrigerator Compressor Drive |
|---|---|
|
Use Scenario: Precise speed and direction control of universal motor in washing machine drum during wash/spin cycles. IC Role / Device Role / Timing Role: AC mains static switch replacing mechanical relay; handles bidirectional 6 A inductive load with zero-crossing-compatible turn-on. Use Value: Eliminates relay wear-out and contact arcing; enables silent, maintenance-free operation with programmable timing via MCU gate pulse width. |
Use Scenario: Start/stop and overload-protected control of hermetic compressor in refrigerator or air conditioner. IC Role / Device Role / Timing Role: High-reliability AC switch managing inrush current (up to 45 A surge) and steady-state 6 A load without snubber network. Use Value: Withstands compressor turn-off inductive spikes and line surges per IEC 61000-4-5, reducing failure rate in field-deployed units. |
| Industrial Fan Speed Regulation | Smart Plug AC Load Switching |
|
Use Scenario: Variable-speed control of 230 V AC induction fan in HVAC or factory ventilation systems. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical contactor; switches full sine wave with phase-angle or zero-crossing logic. Use Value: Delivers smooth speed ramp-up/down and eliminates contact bounce; thermal design supports continuous 6 A at ambient ≤62 °C. |
Use Scenario: Remote-controlled on/off switching of household AC loads (lamps, heaters, small appliances) via Wi-Fi/BLE smart plug. IC Role / Device Role / Timing Role: Safety-certified AC power switch with reinforced insulation (1500 VRMS) and built-in surge protection. Use Value: Meets UL/EN 60730 requirements for automatic electrical controls; reduces bill-of-materials by integrating protection previously requiring 3+ discrete components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST610-8FP | Same die, identical electrical specs (6 A, 800 V, <10 mA IGT), TO-220FPAB package, but marked "ACST6108" - pinout and thermal performance identical. | No functional difference; used interchangeably in same PCB footprint and thermal layout. | Select when standard marking format (ACST6108) is required for traceability or legacy BOM alignment. |
| ACS108-8T | Lower current rating (1.2 A RMS), same 800 V VDRM, TO-220AB (non-insulated) package, higher Rth(j-c) (2.5 °C/W) but no isolation. | Suitable only for sub-2 A loads; requires external insulation and snubber for surge protection - not drop-in compatible. | Choose only for cost-sensitive, low-power applications where isolation and surge immunity are handled externally. |
Compared with ACST6-7SG, ACST610-8FP offers identical performance in the same insulated package, while ACS108-8T trades off current capacity, integrated protection, and isolation for lower cost - making ACST6-7SG optimal for 6 A mains-switching where safety, reliability, and BOM reduction are prioritized.
Availability
ACST6-7SG is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, industrial fan regulation, and smart plug AC load switching requiring stable component supply, long lifecycle support, and certified surge immunity.
Supply support for ACST6-7SG 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The ACST6 series belongs to ST's ACS™/ACST power switch family built with A.S.D.® (application-specific discrete) technology - engineered specifically for robust, self-protected AC mains switching in home appliances and industrial equipment.
FAQ
What is the maximum continuous load current supported by ACST6-7SG?
The ACST6-7SG supports a continuous RMS on-state current of 6 A when mounted on a heatsink at case temperature ≤92 °C (per TO-220FPAB rating). At higher ambient temperatures or with reduced heatsinking, derating applies - e.g., 1.5 A at 62 °C ambient with 1 cm² copper pad (D²PAK variant data). Peak non-repetitive surge current reaches 45 A (50 Hz, 20 ms).
Does ACST6-7SG require an external snubber circuit for inductive loads?
No. ACST6-7SG embeds an integrated overvoltage clamping device (VCL ≥850 V) and high dV/dt immunity (≥500 V/µs), enabling safe commutation of inductive loads like universal motors and compressors without external RC snubbers - validated per IEC 61000-4-5 surge testing up to 2 kV.
Can ACST6-7SG be driven directly by a 3.3 V microcontroller GPIO?
Yes. With IGT <10 mA and VGT ≤1.0 V, ACST6-7SG can be triggered using a single series resistor (e.g., 220 Ω for 3.3 V GPIO) without level-shifting or buffer stages. Gate power dissipation remains within limits (PGM = 10 W peak, PG(AV) = 0.1 W), supporting PWM or pulse-triggered operation.
What safety certifications does the TO-220FPAB package support?
The TO-220FPAB package provides 1500 VRMS insulation between main terminals and mounting tab, satisfying reinforced insulation requirements per IEC/UL 60730 and EN 60335 for Class I household appliances. Its UL94 V0-rated epoxy housing and defined creepage/clearance dimensions facilitate end-equipment safety certification without additional isolation barriers.
ACST6-7SG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ACST6-7SG through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST6-7SG 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 reliable?
The price and inventory of ACST6-7SG 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 is usually 5 days.
3.What payment methods are accepted for ACST6-7SG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST6-7SG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST6-7SG?
ACST6-7SG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST6-7SG 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?
For technical support, including ACST6-7SG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST6-7SG requirements.
6.How does Aetrix verify that ACST6-7SG is sourced from the original manufacturer or authorized distributors?
All ACST6-7SG 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 meets industry standards.
7.What is the process for return or replacement of ACST6-7SG?
All ACST6-7SG units undergo pre-shipment inspection (PSI). If there is an issue with ACST6-7SG, 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 part is unused and in its original packaging.
Return procedure for ACST6-7SG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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