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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACST610-8T

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

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Part No.:: ACST610-8T

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: ACST610-8T.pdf

Description:: TRIAC SENS GATE 800V 6A TO220

Quantity:: RFQ Add To RFQ list

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Inventory:101,552

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Product details

Overview

ACST610-8T from STMicroelectronics is a 6 A, 800 V RMS overvoltage-protected AC switch (Triac with integrated crowbar clamping), housed in an insulated TO-220AB package. It delivers low gate trigger current (< 10 mA), high dV/dt immunity (> 500 V/µs at 125 °C), and withstands 2 kV line transients per IEC 61000-4-5 - enabling direct MCU-driven static switching of universal motors in washing machines without external snubbers or TVS.

For engineers reviewing the ACST610-8T datasheet, ACST610-8T pinout, ACST610-8T application, or ACST610-8T equivalent, this device is selected for robust AC mains control in cost-sensitive, safety-critical home appliance designs where reduced passive count, IEC-compliant surge resilience, and planar-triac reliability are mandatory.

Technical Context

The ACST610-8T integrates a planar Triac structure with a monolithic high-voltage clamping device that activates during overvoltage events - either clamping low-energy spikes or crowbarring into conduction for ≤10 ms to dissipate high-energy surges (e.g., 2 kV, 120 A, 8/20 µs) across the load. Its gate-triggering threshold remains stable across -40 to +125 °C junction temperature.

It operates in all four quadrants with guaranteed IGT ≤ 10 mA at 25 °C and exhibits critical dI/dt capability of 100 A/µs at 125 °C, supporting reliable turn-on under fast-rising gate drive and inductive load commutation without false triggering.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	6 A - Sustains continuous 6 A RMS load current at Tc = 106 °C without heatsink derating beyond standard TO-220AB thermal limits.
VDRM / VRRM	800 V - Blocks up to 800 V peak reverse or off-state voltage, suitable for 230 VAC mains with ≥2× safety margin.
IGT	< 10 mA - Enables direct drive from MCU GPIO via single series resistor (e.g., 1.2 kΩ @ 12 V), eliminating gate driver ICs.
dV/dt (min)	500 V/µs at 125 °C - Prevents false turn-on from fast line transients (IEC 61000-4-4), even at maximum operating temperature.
VCL (min)	850 V at 25 °C - Clamping voltage ensures safe foldback during surges; combined with load impedance, enables 2 kV transient withstand per IEC 61000-4-5.
Rth(j-c)	2.5 °C/W - Low junction-to-case thermal resistance allows efficient heat transfer to PCB copper or heatsink, supporting high-power density layouts.
ITSM (50 Hz)	45 A - Withstands 45 A non-repetitive surge (20 ms sine half-cycle), sufficient for compressor inrush and motor stall currents.

Pinout & Package

ACST610-8T uses the TO-220AB package: insulated plastic body with metal tab (electrically isolated), UL-certified (E81734), 2000 VRMS insulation rating, and recommended mounting torque of 0.4–0.6 N·m. Tab is electrically connected to the COM terminal.

Pin/Terminal	Circuit Role	Design Meaning
G	Gate	Low-current control input; triggers conduction in all four quadrants; requires ≤10 mA to activate reliably at 25 °C.
OUT	Main output (anode side)	Carries full load current; referenced to COM; polarity agnostic due to Triac topology.
COM	Common (cathode side / return path)	Electrically tied to insulated metal tab; serves as current return and thermal interface; must be connected to system ground or neutral reference.

Key Features

Feature	Design Value
Integrated overvoltage protection	Monolithic crowbar clamping eliminates need for external MOVs or TVS diodes, reducing BOM count and board space.
Planar Triac technology	Ensures high off-state reliability and stable dynamic parameters (VTM ≤ 1.4 V, Rd ≤ 80 mΩ) over temperature and lifetime.
UL-insulated TO-220AB package	2000 VRMS isolation enables direct mounting on non-isolated heatsinks while meeting reinforced insulation requirements for Class I appliances.
High noise immunity	Complies with IEC 61000-4-4 (fast transient burst) and IEC 61000-4-5 (surge) without additional filtering or shielding.
Quadrant III optimized gate	Guaranteed turn-on with negative gate-to-COM voltage, simplifying zero-crossing driver design for bidirectional AC control.

Applications

Washing Machine Drum Motor Control

Refrigerator Compressor Start/Run

Use Scenario: Precise speed and direction control of universal motor driving washing machine drum via phase-angle or burst-fire AC switching.

IC Role / Device Role / Timing Role: AC mains static switch replacing mechanical relays; handles 6 A peak motor current with zero-crossing synchronized gating.

Use Value: Eliminates relay wear-out and audible click; enables soft-start and torque modulation without snubber components.

Use Scenario: Solid-state start/run switching for hermetic compressors in refrigerators and air conditioners, managing inrush (≥4× rated current) and steady-state loads.

IC Role / Device Role / Timing Role: High-surge-capable AC switch providing latching hold during compressor run phase and controlled turn-off at zero-crossing.

Use Value: Withstands 45 A non-repetitive surge (20 ms) and recovers blocking capability after IEC 61000-4-5 transients - no latch-up or degradation.

Induction Cooktop Power Stage

Industrial AC Heater Control

Use Scenario: Medium-power (≤1.3 kW) AC heating element switching in induction cooktops requiring rapid on/off cycling and EMI robustness.

IC Role / Device Role / Timing Role: Fast-turn-on Triac delivering precise power regulation via duty-cycle control; gate driven directly by microcontroller PWM output.

Use Value: Low IGT (<10 mA) and high dV/dt immunity prevent misfiring during high-frequency switching near magnetic field sources.

Use Scenario: Reliable on/off control of resistive heating elements (e.g., ovens, dryers) in industrial control panels exposed to factory-level electrical noise and voltage sags.

IC Role / Device Role / Timing Role: Fail-safe AC switch with built-in overvoltage foldback, ensuring continued operation during line disturbances without component failure.

Use Value: Reduces field failure rate by eliminating external transient protection components prone to aging or thermal runaway.

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, TO-220FPAB package with 2000 VRMS insulation and lower Rth(j-c) = 4.25 °C/W; heavier (2.4 g).	Preferred where higher thermal performance is needed and PCB layout permits insulated tab mounting.	Select when heatsinking efficiency > mechanical clearance constraints; not drop-in due to different footprint and mounting hole pattern.
ACS108-8SN	Lower IT(RMS) = 1.2 A; same 800 V VDRM; lacks integrated overvoltage clamping; requires external TVS.	Suitable only for sub-1 A lighting or fan control; cannot replace ACST610-8T in motor/compressor applications.	Choose only for ultra-low-cost, low-power static switching where surge immunity is managed externally.

Compared with ACST610-8FP, the -8T offers identical electrical specs but trades thermal performance for lower profile and simpler mounting; versus ACS108-8SN, it provides 5× higher current handling and eliminates external protection - making it the sole viable option for 6 A inductive load switching with IEC 61000-4-5 compliance.

Availability

ACST610-8T is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor switching, and industrial AC heater regulation requiring stable component supply, long-lifecycle support, and UL-certified insulation integrity.

Supply support for ACST610-8T 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, microcontroller, 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 robust, snubberless AC mains control in home appliances - prioritizing surge resilience, gate drive simplicity, and thermal reliability over generic Triac performance.

FAQ

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

Yes. The device supports both phase-angle and zero-crossing switching modes. Its guaranteed turn-on in Quadrant III with negative gate voltage and high dV/dt immunity (>500 V/µs) ensure reliable synchronization with zero-crossing detectors, minimizing EMI and inrush stress during turn-on.

Does ACST610-8T require a heatsink in typical appliance applications?

At 6 A RMS with Tc = 106 °C, the TO-220AB package achieves thermal equilibrium with ≥25 cm² copper area on FR-4 PCB. For sustained full-load operation in enclosed environments, a small clip-on heatsink (Rth ≤ 10 °C/W) is recommended - but no heatsink is required for intermittent duty like washing machine cycles.

Can ACST610-8T replace a standard Triac like BT139-800 in existing designs?

Yes, with minor layout updates: G, OUT, and COM pins map directly, but the insulated TO-220AB tab must be mounted without electrical contact to chassis ground. Gate resistor value may be reduced due to lower IGT (≤10 mA vs. typical 35 mA), improving drive efficiency and noise margin.

What is the expected lifetime under IEC 61000-4-5 surge conditions?

Per ST's qualification testing, ACST610-8T withstands ≥10 non-repetitive 2 kV surges (1.2/50 µs voltage, 8/20 µs current) per polarity without parameter shift or functional failure. Lifetime remains unaffected when operated within absolute maximum ratings and derated per Figure 3 (IT(RMS) vs. Tc).

ACST610-8T Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ACS™/A.S.D®

Package/Case:: TO-220-3

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:: Through Hole

Supplier Device Package:: TO-220

ACST610-8T FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your ACST610-8T 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 ACST610-8T?

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

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

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

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

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

Return procedure for ACST610-8T:

1.Submit a request within 90 days.

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

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