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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACST610-8GTR

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

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Part No.:: ACST610-8GTR

Manufacturer:: STMicroelectronics

Category:: TRIACs

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

Datasheet:: ACST610-8GTR.pdf

Description:: TRIAC SENS GATE 800V 6A D2PAK

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Product details

Overview

ACST610-8GTR from STMicroelectronics is an overvoltage-protected AC switch (integrated triac + clamping device) designed for direct mains-connected static switching of inductive AC loads up to 6 A RMS. It features 800 V blocking voltage (V_DRM/V_RRM), low gate trigger current (<10 mA), and integrated crowbar-based overvoltage protection compliant with IEC 61000-4-5, enabling robust compressor and universal motor control in washing machines and refrigerators.

For engineers reviewing the ACST610-8GTR datasheet, ACST610-8GTR pinout, ACST610-8GTR application, or ACST610-8GTR equivalent, this device offers verified self-protected AC switching without external snubbers, high dV/dt immunity (>500 V/µs at 125 °C), and D²PAK package thermal performance suitable for industrial appliance PCB layouts requiring creepage/clearance compliance and conduction cooling.

Technical Context

The ACST610-8GTR integrates a planar triac structure with a monolithically embedded high-voltage clamping device that activates during line transients - either clamping low-energy spikes or crowbarring into conduction for high-energy surges (up to 2 kV peak per IEC 61000-4-5). Its gate-triggering circuit operates across all four quadrants with guaranteed I_GT ≤ 10 mA at 25 °C and maintains noise immunity per IEC 61000-4-4 (fast transient burst).

Thermal design leverages the D²PAK package's R_th(j-a) = 45 °C/W (with 1 cm² copper pad), enabling 6 A RMS conduction at T_c = 106 °C. The device recovers full blocking capability after surge events at the next zero-crossing, ensuring deterministic reset behavior without latch-up or degradation.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	6 A - Sustains continuous sinusoidal load current up to 6 A without heatsink derating when mounted on 1 cm² copper.
VDRM / VRRM	800 V - Blocks 800 V peak AC line voltage, supporting global mains (230 VAC, 240 VAC, 277 VAC) with margin.
IGT (max)	10 mA - Enables direct drive from MCU GPIO via single series resistor (e.g., 1.2 kΩ @ 12 V), eliminating buffer ICs.
dV/dt (min)	500 V/µs at 125 °C - Resists false triggering from fast line transients without RC snubber network.
VCL (min)	850 V at 25 °C - Clamping voltage threshold ensures safe foldback before destructive breakdown during surge events.
Rd (max)	80 mΩ at 125 °C - Low on-state resistance minimizes conduction loss (≤1.7 V_TM at 8.5 A), reducing thermal stress.
I²t (fuse selection)	13 A²s - Defines minimum fuse let-through energy rating to clear faults before device failure.

Pinout & Package

D²PAK (TO-263) surface-mount package with insulated tab, UL-recognized insulation (2000 V_RMS), and thermal pad optimized for conduction cooling on 1 cm² copper area.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Quadrant-sensitive trigger input; accepts ≤1.6 A peak gate current; requires no polarity reversal for AC phase control.
OUT	Main terminal T2 (anode side)	Carries full load current; electrically isolated from tab; connects to load side of AC line.
COM	Main terminal T1 (cathode side)	Reference terminal tied to neutral or return path; defines voltage reference for gate triggering and clamping action.

Key Features

Feature	Design Value
Integrated overvoltage protection	Self-contained crowbar clamping eliminates need for MOVs, TVS diodes, or RC snubbers in IEC 61000-4-5-compliant designs.
Low I_GT & high noise immunity	Guaranteed <10 mA gate drive enables direct MCU interfacing while maintaining >500 V/µs dV/dt immunity at full operating temperature.
Planar triac technology	Ensures stable off-state leakage (<500 µA at 125 °C) and high reliability under repeated surge stress without parameter drift.
D²PAK thermal performance	R_th(j-a) = 45 °C/W (on 1 cm² copper) supports 6 A RMS operation in compact, fanless appliance PCBs.
IEC 61000-4-4/4-5 compliance	Validated against fast transient bursts (4 kV) and surge waveforms (2 kV, 1.2/50 µs), reducing system-level EMC test risk.

Applications

Washing Machine Drum Motor Control

Refrigerator Compressor Drive

Use Scenario: Bidirectional speed and direction control of universal motors in drum assemblies using phase-angle or burst-fire AC switching.

IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relays; handles inrush currents up to 45 A peak and commutates at zero-crossing.

Use Value: Eliminates relay wear-out and acoustic noise; sustains 6 A RMS continuously with no external snubber due to integrated VCL clamping.

Use Scenario: Start-stop cycling of hermetic compressors in refrigeration systems exposed to grid surges and inductive turn-off transients.

IC Role / Device Role / Timing Role: Solid-state replacement for contactor-based compressor control; withstands 2 kV line surges per IEC 61000-4-5 without failure.

Use Value: Prevents compressor lock-up or controller damage during brownouts and lightning-induced transients; recovers automatically at next zero-crossing.

Industrial HVAC Fan Control

Smart Plug Load Switching

Use Scenario: Modulated AC power delivery to PSC or shaded-pole fans in commercial HVAC units with variable airflow requirements.

IC Role / Device Role / Timing Role: High-reliability AC switch interfaced with microcontroller PWM timing logic for precise duty-cycle control.

Use Value: Delivers stable 6 A RMS output with <1.7 V conduction drop, minimizing heat generation in enclosed duct-mounted enclosures.

Use Scenario: Mains-rated switching in Wi-Fi/Zigbee smart plugs where space, safety certification, and surge resilience are critical.

IC Role / Device Role / Timing Role: Primary isolation and switching element meeting UL 60730 and IEC 61000-4-5 Class 3 requirements.

Use Value: Reduces BOM count by removing discrete protection components; D²PAK footprint simplifies automated assembly and creepage compliance.

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; same 800 V rating; SO-8 package; no integrated overvoltage protection.	Suitable only for low-power auxiliary loads (e.g., indicator lamps, solenoids); requires external MOV/TVS for surge handling.	Select when board space is constrained and load current ≤ 0.8 A; not a functional substitute for 6 A motor/compressor switching.
BTB16-800CW	Standard triac (no clamping); IT(RMS) = 16 A; TO-220 package; IGT = 50 mA; requires external snubber.	Used in high-current industrial panels but adds design complexity for surge protection and EMI filtering.	Choose only if higher current headroom is needed and external protection components are acceptable in the BOM and layout.

Compared with ACS108-8SN and BTB16-800CW, the ACST610-8GTR uniquely delivers 6 A switching with monolithic overvoltage protection in a surface-mount D²PAK, reducing system-level validation effort for IEC 61000-4-5 compliance while maintaining MCU-direct drivability.

Availability

ACST610-8GTR is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, and smart plug load switching requiring stable component supply, long lifecycle support, and certified surge resilience.

Supply support for ACST610-8GTR 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, microcontrollers, and automotive-grade ICs.

The ACST6 series belongs to ST's Application-Specific Discrete (A.S.D.) power switch family, engineered specifically for reliable, snubberless AC mains control in white goods and industrial equipment where surge immunity and thermal efficiency are critical.

FAQ

Is ACST610-8GTR compatible with zero-crossing detection circuits?

Yes - the ACST610-8GTR supports both phase-control and zero-crossing switching modes. Its low I_GT and high dV/dt immunity allow clean triggering synchronized to zero-crossing signals from optocouplers or MCU timers without false turn-on. Gate timing must respect minimum pulse width (20 µs) and avoid sub-microsecond edge rates that exceed dI/dt limits.

Does the D²PAK package require solder paste stencil optimization for thermal pad reflow?

Yes - the D²PAK thermal pad (exposed copper tab) requires a 70–80% open-area stencil with 5–7 vias (0.3 mm diameter, filled with solder) connecting to inner ground planes. ST recommends IPC-7351B "SOIC263" footprint with 1 cm² copper pour; insufficient thermal relief causes junction temperature rise beyond 125 °C at 6 A RMS.

Can ACST610-8GTR replace a mechanical relay in a 230 VAC, 5 A resistive load application?

Yes - it exceeds requirements: 800 V blocking voltage provides 3.5× margin over 230 VAC peak (325 V), and 6 A RMS rating covers 5 A loads with thermal headroom. Unlike relays, it offers silent operation, infinite cycle life, and immunity to contact welding - but requires proper gate drive isolation and heatsinking for continuous duty.

What is the maximum allowable gate resistor value when driving from a 3.3 V MCU GPIO?

For reliable triggering at 25 °C, R_G ≤ 330 Ω is recommended (I_G ≥ 10 mA). At 125 °C, I_GT increases up to 2.5× typical, so R_G must be reduced to ≤ 150 Ω to maintain ≥10 mA worst-case. ST AN4377 confirms 220 Ω as optimal for 3.3 V/5 V MCUs across full temperature range.

ACST610-8GTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ACS™/A.S.D®

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

Packaging:: Tape & Reel (TR)

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

ACST610-8GTR FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your ACST610-8GTR 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 ACST610-8GTR?

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

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

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

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

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

Return procedure for ACST610-8GTR:

1.Submit a request within 90 days.

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

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