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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACST410-8FP

Name: ACST410-8FP
Brand: STMicroelectronics
SKU: ACST410-8FP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ACST410-8FP

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3 Full Pack

Datasheet:: ACST410-8FP.pdf

Description:: TRIAC SENS GATE 800V TO220FPAB

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Product details

Overview

ACST410-8FP from STMicroelectronics is a 4 A, 800 V insulated AC switch with integrated overvoltage clamping, designed as a self-protected triac replacement for mains-connected inductive load control. It features low gate trigger current (IGT < 10 mA), high static dV/dt immunity (>1000 V/μs at Tj = 125 °C), and TO-220FPAB package with 2000 VRMS insulation - enabling direct MCU-driven compressor and drum motor switching in washing machines and refrigerators without external snubbers or transient protection.

For engineers reviewing the ACST410-8FP datasheet, ACST410-8FP pinout, ACST410-8FP application, or ACST410-8FP equivalent, this device is selected for IEC 61000-4-4/4-5-compliant AC static switching where gate drive simplicity, off-state reliability, and surge ruggedness are critical - especially in space-constrained appliance control boards requiring reinforced isolation and zero external crowbar components.

Technical Context

The ACST410-8FP implements a planar triac structure with monolithically integrated voltage-clamping circuitry that activates at ≥850 V (VCL) to absorb inductive turn-off energy or divert IEC 61000-4-5 surges up to 2 kV. Its gate-triggering threshold remains stable across −40 °C to +125 °C junction temperature, with IGT ≤10 mA and VGT ≤1.0 V under standard test conditions.

It operates in all four quadrants with guaranteed latching (IL ≤40 mA) and holding (IH ≤20 mA) currents, and sustains repetitive dI/dt up to 100 A/μs without commutation failure. Thermal resistance is 4.6 °C/W (junction-to-case) in TO-220FPAB, supporting 4 A RMS conduction at Tc = 102 °C without forced cooling.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	4 A - Sustains continuous sinusoidal load current up to 4 A at case temperature ≤102 °C in TO-220FPAB package
VDRM / VRRM	800 V - Blocks 800 V peak AC line voltage in both directions, suitable for 230 VAC mains with safety margin
IGT (max)	10 mA - Enables direct drive from low-power MCU GPIO via single series resistor (e.g., 1 kΩ @ 3.3 V)
dV/dt (min)	1000 V/μs - Immune to fast transients per IEC 61000-4-4 without false triggering, even at max junction temperature
VCL (min)	850 V - Clamps overvoltage spikes above this threshold, protecting downstream circuitry and eliminating need for MOVs or TVS diodes
Rth(j-c)	4.6 °C/W - Enables thermal design with passive heatsinking only; 10 W dissipation yields ≤46 °C junction rise above case
IDRM / IRRM	0.5 mA @ 125 °C - Low leakage ensures reliable off-state blocking during high-temperature operation in enclosed appliances

Pinout & Package

ACST410-8FP uses the TO-220FPAB package: insulated plastic housing with metal tab, UL-certified (File E81734), 2000 VRMS isolation, and recommended mounting torque of 0.4–0.6 N·m. Tab is electrically connected to COM terminal.

Pin/Terminal	Circuit Role	Design Meaning
COM	Common reference terminal	Connected to heatsink and system ground plane; serves as return path for gate and load current; electrically isolated from tab only by molded insulation
G	Gate control input	Low-current trigger input (≤10 mA); referenced to COM; enables full-conduction when pulsed with ≥10 mA for ≥1 μs
OUT	Main load output terminal	Carries full AC load current (up to 4 A RMS); bidirectional conduction path between OUT and COM; voltage clamped at ≥850 V during transients

Key Features

Feature	Design Value
Integrated overvoltage clamping	Eliminates external MOVs or TVS diodes by clamping transients ≥850 V and safely conducting surge energy through load
High noise immunity	Static dV/dt > 1000 V/μs at 125 °C ensures no false triggering from EMI in noisy appliance environments
Insulated TO-220FPAB package	2000 VRMS isolation meets reinforced insulation requirements for Class I appliances without additional creepage/clearance measures
Planar triac technology	Enables stable latching/holding behavior and high off-state reliability over 10+ year product lifetimes in compressor cycling applications
MCU-direct gate drive	IGT ≤10 mA allows use of standard 3.3 V or 5 V microcontroller outputs with only a current-limiting resistor (e.g., 330 Ω)

Applications

Washing Machine Drum Motor Control

Refrigerator Compressor Start/Run

Use Scenario: Bidirectional speed and direction control of universal AC motors in washing machine spin cycles and wash phases.

IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relays; handles 4 A inductive loads with zero-crossing-compatible turn-on and inherent surge suppression.

Use Value: Reduces BOM count by eliminating snubber RC networks and external transient suppressors while meeting IEC 61000-4-5 Level 3 immunity.

Use Scenario: Inrush-current-tolerant start/run switching for hermetic compressors in domestic refrigerators and freezers.

IC Role / Device Role / Timing Role: Solid-state alternative to contactors; sustains 32 A non-repetitive surge (IEC 61000-4-5) during compressor startup without degradation.

Use Value: Extends system lifetime by avoiding contact welding/fatigue and enables precise timing of run/start phase transitions via MCU logic.

Air Conditioner Fan Motor Control

Industrial HVAC Blower Activation

Use Scenario: Medium-power AC fan motor switching in split-system air conditioners with variable airflow staging.

IC Role / Device Role / Timing Role: Mains-rated solid-state switch interfacing directly with HVAC controller MCU; handles 4 A resistive-inductive loads at 50/60 Hz.

Use Value: Enables silent, bounce-free switching with no audible relay click and eliminates arcing-related EMI in sensitive RF environments.

Use Scenario: Reliable on/off control of centrifugal blowers in commercial HVAC systems operating continuously at elevated ambient temperatures.

IC Role / Device Role / Timing Role: High-reliability AC switch rated for 125 °C junction operation; maintains 0.5 mA max leakage at full temperature range.

Use Value: Supports extended thermal derating margins and eliminates periodic maintenance associated with electromechanical contactors in dusty, high-temp duct environments.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACST435-8FP	Higher IGT (≤35 mA) but identical VDRM, VCL, and package; lower dV/dt immunity (500 V/μs min)	Better suited for noisy industrial settings where gate drive margin is prioritized over EMI rejection	Select when gate driver has limited current capability but system-level filtering reduces fast transient coupling
BTB16-600CW	Standard triac (no integrated clamping); VDRM = 600 V; requires external snubber and MOV for IEC 61000-4-5 compliance	Lower cost but increases BOM, PCB area, and validation effort for surge immunity	Choose only if legacy design reuse mandates pin-compatible triac and external protection is already implemented

Compared with ACST435-8FP, ACST410-8FP offers superior noise immunity and lower gate drive burden; compared with BTB16-600CW, it delivers system-level simplification by integrating clamping and insulation - reducing time-to-certification for IEC 61000-4-4/4-5.

Availability

ACST410-8FP is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor activation, and HVAC blower switching requiring stable component supply, long-lifecycle support, and certified surge immunity.

Supply support for ACST410-8FP 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 ACST4 series belongs to ST's ACS/ACST family of self-protected AC switches, engineered specifically for high-reliability, low-BOM-count mains control in white goods and industrial equipment where surge resilience and gate drive simplicity are mandatory.

FAQ

Does ACST410-8FP require a heat sink in 4 A continuous operation?

Yes - at 4 A RMS conduction, power dissipation exceeds 2.5 W (based on VTM ≈ 1.7 V and RD ≈ 110 mΩ). With Rth(j-c) = 4.6 °C/W, a heatsink maintaining case temperature ≤102 °C is required. Free-air operation supports only ≤1.2 A RMS per Figure 3.

Can ACST410-8FP replace a mechanical relay in a 230 VAC, 3 A washing machine motor circuit?

Yes - it supports 4 A RMS at 230 VAC with built-in 2 kV surge withstand (IEC 61000-4-5), eliminates contact wear and bounce, and enables zero-crossing-compatible digital control. No snubber or external clamping is needed due to integrated VCL ≥850 V.

What is the maximum allowable gate resistor value when driving ACST410-8FP from a 3.3 V MCU GPIO?

For guaranteed turn-on at worst-case IGT = 10 mA and VGT = 1.0 V, the maximum series gate resistor is (3.3 V − 1.0 V) / 10 mA = 230 Ω. A 220 Ω resistor is recommended to ensure margin across temperature and process variation.

Is the TO-220FPAB package lead-free and RoHS compliant?

Yes - ACST410-8FP is manufactured in ST's ECOPACK2-compliant TO-220FPAB package, featuring halogen-free molding compound, lead-free terminations, and full RoHS/REACH compliance per ST's published environmental documentation.

ACST410-8FP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: ACS™/A.S.D®

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Active

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 800 V

Current - On State (It (RMS)) (Max):: 4 A

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 30A, 32A

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

Current - Hold (Ih) (Max):: 20 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FPAB

ACST410-8FP FAQ

1.How can I place an order for ACST410-8FP through Aetrix?

Please submit a Request for Quotation (RFQ) for ACST410-8FP 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 ACST410-8FP reliable?

The price and inventory of ACST410-8FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST410-8FP is usually 5 days.

3.What payment methods are accepted for ACST410-8FP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST410-8FP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ACST410-8FP?

ACST410-8FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ACST410-8FP 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 ACST410-8FP?

For technical support, including ACST410-8FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST410-8FP requirements.

6.How does Aetrix verify that ACST410-8FP is sourced from the original manufacturer or authorized distributors?

All ACST410-8FP 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 ACST410-8FP meets industry standards.

7.What is the process for return or replacement of ACST410-8FP?

All ACST410-8FP units undergo pre-shipment inspection (PSI). If there is an issue with ACST410-8FP, 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 ACST410-8FP part is unused and in its original packaging.

Return procedure for ACST410-8FP:

1.Submit a request within 90 days.

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

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