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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACST610-8G

Name: ACST610-8G
Brand: STMicroelectronics
SKU: ACST610-8G
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ACST610-8G

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: ACST610-8G.pdf

Description:: TRIAC SENS GATE 800V 6A D2PAK

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Inventory:234

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Product details

Overview

ACST610-8G from STMicroelectronics is a 6 A, 800 V RMS overvoltage-protected AC switch (Triac with integrated crowbar clamping), housed in a D²PAK package. It delivers low gate trigger current (<10 mA), high dV/dt immunity (≥500 V/µs at 125 °C), and clamps transients up to 2 kV per IEC 61000-4-5 - enabling direct MCU-driven static switching of universal motors and compressors in washing machines and refrigerators.

For engineers reviewing the ACST610-8G datasheet, ACST610-8G pinout, ACST610-8G application, or ACST610-8G equivalent, this device serves as a self-protected AC power switch for medium-power inductive loads where snubberless operation, IEC-compliant surge ruggedness, and thermal reliability at 125 °C junction temperature are critical design requirements.

Technical Context

The ACST610-8G integrates a planar Triac structure with an on-die high-voltage clamping device that activates during line transients, folding back into conduction to safely dissipate energy without external protection. Its gate-triggering threshold remains stable across -40 to +125 °C, with IGT ≤ 10 mA and VGT ≤ 1.0 V under standard test conditions (V_OUT = 12 V, R_L = 33 Ω).

It operates in all four quadrants with guaranteed latching (I_L ≤ 40 mA) and holding (I_H ≤ 25 mA) currents, supports dI/dt up to 100 A/µs, and maintains blocking capability after transient recovery at the next zero-crossing - essential for robust AC mains control in appliance motor drives.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	6 A - Sustains continuous sinusoidal load current up to 6 A without heatsink derating at T_c = 106 °C (D²PAK on 1 cm² copper)
VDRM / VRRM	800 V - Blocks 800 V peak reverse/forward voltage, suitable for 230 VAC mains with safety margin
IGT	< 10 mA - Enables direct drive from low-power MCU GPIO via simple series resistor (no buffer stage required)
VCL	≥ 850 V - Clamping voltage threshold ensures safe crowbar activation before destructive overvoltage occurs
dV/dt	≥ 500 V/µs - Immune to fast transients per IEC 61000-4-4, eliminating false triggering in noisy industrial environments
R_th(j-c)	2.5 °C/W - Low thermal resistance enables efficient heat transfer from junction to case in D²PAK package
I₂t	13 A²s - Supports fuse coordination for surge protection without nuisance blowing during inrush events

Pinout & Package

ACST610-8G uses the D²PAK (TO-263) surface-mount package: insulated epoxy body (UL94 V0), 3-pin configuration (G, OUT, COM), designed for high-current conduction and PCB-level thermal management via large copper pad (1 cm² recommended). Mounting torque not applicable (soldered only).

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Low-energy control input; triggers conduction when I_GT ≥ 10 mA applied between G and COM
OUT	Main output terminal (anode side)	Carries full load current; referenced to COM; polarity agnostic due to Triac structure
COM	Common terminal (cathode side)	Return path for load current and gate reference; connects to neutral or return rail in AC bridge configurations

Key Features

Feature	Design Value
Integrated overvoltage crowbar protection	Clamps 2 kV surges per IEC 61000-4-5 without external MOVs or snubbers - reduces BOM count and board space
Snubberless inductive load switching	Drives 6 A universal motors and compressors without external RC snubbers, even under high dI/dt turn-off conditions
High noise immunity	Meets IEC 61000-4-4 burst immunity (±2 kV contact, ±4 kV air) due to ≥500 V/µs dV/dt rating and planar junction design
MCU-direct gate drive	IGT ≤ 10 mA allows single-resistor interface to 3.3 V or 5 V microcontrollers - eliminates level-shifting or driver ICs
Thermal reliability	Junction-to-case R_th(j-c) = 2.5 °C/W and T_j range of –40 to +125 °C support sustained operation in sealed appliance enclosures

Applications

Washing Machine Drum Motor Control

Refrigerator Compressor Drive

Use Scenario: Bidirectional speed and direction control of universal motor in drum assembly using phase-angle or zero-cross switching.

IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relay; handles 6 A peak inrush and continuous torque load with snubberless commutation.

Use Value: Eliminates relay wear-out and acoustic noise while maintaining IEC 61000-4-5 compliance via on-chip clamping at 850 V minimum V_CL.

Use Scenario: Start/stop and run-cycle control of hermetic compressor in refrigeration system with high inrush current.

IC Role / Device Role / Timing Role: Solid-state AC switch managing 6 A RMS load; withstands 45 A non-repetitive surge (50 Hz, 20 ms) without failure.

Use Value: Replaces discrete Triac + MOV + snubber network, reducing component count by ≥3 parts and improving long-term reliability under thermal cycling.

Industrial Fan Speed Controller

Smart Plug AC Load Switching

Use Scenario: Variable-speed control of 230 VAC induction fan in HVAC duct systems using microcontroller-based phase-cut dimming.

IC Role / Device Role / Timing Role: High-dV/dt AC switch ensuring clean turn-on/turn-off without false triggering during EMI-rich duct environments.

Use Value: Maintains ≥500 V/µs immunity at 125 °C junction temperature - avoids spurious conduction during fan startup transients.

Use Scenario: Remote-controlled on/off switching of 230 VAC resistive or mixed loads (lamps, heaters) in IoT-enabled smart outlets.

IC Role / Device Role / Timing Role: Self-protected AC switch providing galvanic isolation via D²PAK creepage/clearance and 2000 V_RMS insulation (in TO-220FPAB variant; D²PAK meets IEC 60747-5-2).

Use Value: Enables UL/CE-certified designs without external isolation barriers or transient suppressors - accelerates safety certification.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACS108-8SN	Lower IT(RMS) = 0.8 A; SO-8 package; no integrated overvoltage clamping - requires external MOV	Suitable only for <1 A resistive loads (e.g., LED drivers); not rated for motor/compressor inrush	Select only for low-power, space-constrained, non-inductive applications where clamping is handled externally
BTB16-800CW	Standard Triac (no clamping); IT(RMS) = 16 A; TO-220 package; IGT = 35 mA; requires external snubber	Supports higher current but lacks self-protection - needs MOV + RC snubber for IEC 61000-4-5 compliance	Choose when cost-per-amp is prioritized and board space allows external protection components

Compared with ACS108-8SN and BTB16-800CW, ACST610-8G uniquely combines 6 A rating, integrated 2 kV surge clamping, and MCU-compatible gate drive - delivering BOM reduction, simplified certification, and snubberless inductive load control in a single D²PAK device.

Availability

ACST610-8G is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, industrial fan regulation, and smart plug AC switching requiring stable component supply, long-lifecycle support, and IEC-compliant surge protection.

Supply support for ACST610-8G 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 Application-Specific Discrete (A.S.D.) power switch family, engineered specifically for snubberless, self-protected AC mains control in home appliances and industrial equipment - targeting reliability, safety compliance, and system-level simplification.

FAQ

Is ACST610-8G compatible with zero-cross detection circuits?

Yes. ACST610-8G supports both phase-angle and zero-cross switching modes. Its low IGT (<10 mA) and high dV/dt immunity (≥500 V/µs) ensure reliable turn-on synchronization with zero-cross signals, and its internal clamping remains active regardless of firing angle - making it suitable for dimming, soft-start, and noise-sensitive applications.

What is the maximum ambient temperature for ACST610-8G in free-air convection?

At 6 A RMS load, ACST610-8G in D²PAK package achieves ~2.5 A in free-air convection (per Figure 4). For full 6 A operation, it requires mounting on ≥1 cm² copper area with forced or natural convection cooling. The absolute max ambient temperature is 62 °C at full rating with 1 cm² copper, per Table 2 absolute ratings.

Does ACST610-8G require a heatsink for 6 A operation?

No external heatsink is required if mounted on a 1 cm² copper pad on FR-4 PCB - its R_th(j-a) is 45 °C/W under that condition (Table 5). With proper PCB thermal design, junction temperature stays within –40 to +125 °C limits at 6 A and 62 °C ambient, satisfying IEC 60747-5-2 thermal safety requirements.

Can ACST610-8G replace a mechanical relay in appliance control?

Yes - it replaces electromechanical relays in washing machine timers, compressor controllers, and smart outlet switches. With 6 A RMS rating, 45 A surge tolerance, and >10⁵ cycle lifetime (vs. relay wear-out), it eliminates contact arcing, bounce, and acoustic noise while meeting IEC 61000-4-5 surge immunity without external components.

ACST610-8G Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ACS™/A.S.D®

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

Packaging:: Tube

Product Status:: Active

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 800 V

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

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 45A, 47A

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

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

Configuration:: Single

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

ACST610-8G FAQ

1.How can I place an order for ACST610-8G through Aetrix?

Please submit a Request for Quotation (RFQ) for ACST610-8G 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 ACST610-8G reliable?

The price and inventory of ACST610-8G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST610-8G is usually 5 days.

3.What payment methods are accepted for ACST610-8G?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST610-8G transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ACST610-8G?

ACST610-8G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ACST610-8G 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 ACST610-8G?

For technical support, including ACST610-8G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST610-8G requirements.

6.How does Aetrix verify that ACST610-8G is sourced from the original manufacturer or authorized distributors?

All ACST610-8G 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 ACST610-8G meets industry standards.

7.What is the process for return or replacement of ACST610-8G?

All ACST610-8G units undergo pre-shipment inspection (PSI). If there is an issue with ACST610-8G, 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 ACST610-8G part is unused and in its original packaging.

Return procedure for ACST610-8G:

1.Submit a request within 90 days.

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

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