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Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACST10-7SFP

Name: ACST10-7SFP
Brand: STMicroelectronics
SKU: ACST10-7SFP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ACST10-7SFP

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3 Full Pack

Datasheet:: ACST10-7SFP.pdf

Description:: TRIAC SENS GATE 700V 10A TO220FP

Quantity:: RFQ Add To RFQ list

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Inventory:5,341

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Product details

Overview

ACST10-7SFP from STMicroelectronics is a 10 A, 700 V overvoltage-protected AC switch (Triac) in TO-220FPAB insulated package, featuring high static dV/dt immunity (>2000 V/µs), low gate trigger current (IGT < 35 mA), and integrated crowbar clamping (VCL ≥ 850 V). It drives universal motors in washing machines and compressors in refrigerators without external snubbers or transient protection.

For engineers reviewing the ACST10-7SFP datasheet, ACST10-7SFP pinout, ACST10-7SFP application, or ACST10-7SFP equivalent, this device supports IEC 61000-4-4/4-5-compliant AC mains switching in home appliance control, offers direct MCU gate drive capability, and eliminates need for discrete overvoltage protection components in medium-power inductive load circuits.

Technical Context

The ACST10-7SFP integrates a planar Triac structure with an on-chip overvoltage crowbar circuit that triggers into conduction during transients exceeding VCL (≥850 V), safely dissipating energy through the load. Its high dV/dt immunity (≥2000 V/µs at 125 °C) and robust turn-off commutation enable snubberless operation with inductive loads up to 10 A RMS.

It operates across -40 to +125 °C junction temperature, features insulated case (1500 V_RMS), and delivers low on-state voltage (V_TM ≤ 1.5 V at 14.1 A, 25 °C) and dynamic resistance (R_d ≤ 35 mΩ at 125 °C), ensuring thermal stability under compressor inrush and motor torque transients.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	10 A - Supports continuous medium-power AC loads like fridge compressors and drum motors without heatsink derating at Tc = 84 °C.
VDRM/VRRM	700 V - Blocks standard 230 VAC mains with >3× safety margin against line surges and peak voltages.
IGT	< 35 mA - Enables direct drive from MCU GPIO via simple series resistor; no buffer stage required.
dV/dt (static)	> 2000 V/µs - Prevents false triggering from fast transients per IEC 61000-4-4, eliminating need for gate RC filters.
VCL	≥ 850 V - Clamps inductive turn-off spikes and absorbs IEC 61000-4-5 2 kV surge energy by controlled crowbar action.
Rth(j-c)	3.5 °C/W - Enables predictable thermal design in TO-220FPAB insulated package with 1500 V_RMS isolation.
IDRM/IRRM	< 20 µA @ 25 °C - Ensures low leakage in off-state, critical for zero-crossing accuracy and standby power compliance.

Pinout & Package

ACST10-7SFP uses the TO-220FPAB package: insulated plastic housing with 1500 V_RMS creepage/clearance, UL94 V0 epoxy, and mounting hole for mechanical fixation. Thermal resistance R_th(j-c) = 3.5 °C/W; recommended torque: 0.4–0.6 N·m.

Pin/Terminal	Circuit Role	Design Meaning
COM	Common terminal (MT1)	Main terminal 1 reference node; connected to neutral or low-side return path in AC bridge configurations.
OUT	Output terminal (MT2)	Main terminal 2; carries full load current to AC load; voltage referenced to COM defines blocking state.
G	Gate	Control input; triggers conduction when IGT ≥ 35 mA pulse applied; polarity-insensitive for quadrants I/II/III.

Key Features

Feature	Design Value
Integrated overvoltage crowbar	Clamps transients ≥850 V and switches to on-state for ≤10 ms, enabling self-protection per IEC 61000-4-5 without external MOVs or TVS.
Snubberless inductive switching	Withstands di/dt up to 100 A/µs and commutates 10 A inductive loads (e.g., compressor windings) without external RC snubber networks.
High-noise-immunity gate	Static dV/dt > 2000 V/µs at 125 °C ensures reliable operation in electrically noisy appliance environments (e.g., near motor brushes or relays).
Direct MCU gate drive	IGT < 35 mA allows connection to 3.3 V/5 V microcontroller outputs using only a single current-limiting resistor (e.g., 220 Ω @ 5 V).
Insulated thermal package	TO-220FPAB provides 1500 V_RMS isolation between case and terminals, simplifying safety certification and eliminating need for insulating washers.

Applications

Washing Machine Drum Motor Control

Refrigerator Compressor Drive

Use Scenario: Controlling bidirectional universal motor in washing machine drum for spin/rinse cycles with variable speed and direction.

IC Role / Device Role / Timing Role: AC mains switching device; replaces electromechanical relay with zero-crossing-compatible solid-state switching.

Use Value: Eliminates contact wear and EMI from relay arcing; enables precise phase-angle control for speed regulation and reduces acoustic noise.

Use Scenario: Driving hermetic compressor in domestic refrigerator during startup, run, and defrost cycles with high inrush current tolerance.

IC Role / Device Role / Timing Role: Snubberless AC switch handling 10 A RMS and 100 A surge (20 ms); withstands compressor inrush without external protection.

Use Value: Reduces BOM count by removing snubber RC network and MOV; improves system reliability under repeated cold-start stress.

Air Conditioner Fan Motor Control

Industrial HVAC Blower System

Use Scenario: Regulating AC induction fan motor in split-type air conditioner indoor unit using phase-cut dimming.

IC Role / Device Role / Timing Role: High-dV/dt Triac switching 230 VAC mains; triggered synchronously with zero-crossing detection for EMI reduction.

Use Value: Maintains stable conduction despite fast transients from nearby compressor switching; meets Class B EMC requirements without added filtering.

Use Scenario: Solid-state replacement for contactor in commercial HVAC blower control, operating continuously at elevated ambient temperatures.

IC Role / Device Role / Timing Role: Thermally robust AC switch rated for Tj = 125 °C; used with heatsink for 24/7 industrial duty cycle.

Use Value: Delivers 10 A RMS with R_th(j-c) = 3.5 °C/W in insulated TO-220FPAB, enabling compact heatsink design and reducing maintenance vs. electro-mechanical solutions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACST1010-7FP	Lower IGT (≤10 mA) but reduced dV/dt immunity (200 V/µs vs. 2000 V/µs)	Better suited for low-noise, low-power MCU interfaces; less robust in high-dV/dt industrial environments	Select when gate drive current budget is <10 mA and system EMI is tightly controlled.
BTB12-700CW	No integrated crowbar; requires external MOV/TVS for IEC 61000-4-5 compliance; higher IGT (50 mA)	Lacks self-protection; adds BOM cost and board space for transient suppression components	Choose only if cost sensitivity outweighs safety certification effort and long-term field reliability requirements.

Compared with ACST1010-7FP, ACST10-7SFP trades lower gate sensitivity for 10× higher dV/dt immunity-critical in noisy appliance motor control-while BTB12-700CW lacks crowbar protection entirely, increasing design complexity and risk of transient-induced failure.

Availability

ACST10-7SFP is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, and HVAC blower systems requiring stable component supply, long lifecycle support, and IEC 61000-4-5 compliance.

Supply support for ACST10-7SFP 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The ACST™/ACST family is engineered for robust AC mains switching in white goods and industrial controls, combining Triac topology with A.S.D.® application-specific discrete technology to eliminate external protection components.

FAQ

What is the maximum repetitive surge current rating for ACST10-7SFP?

The ACST10-7SFP supports a non-repetitive surge peak on-state current (I_TSM) of 100 A for 20 ms at 50 Hz, validated per IEC 61000-4-5 test conditions. This rating applies with T_j initial = 25 °C and enables reliable handling of compressor inrush currents without degradation.

Does ACST10-7SFP require a heat sink in typical appliance applications?

Yes-when operating at full 10 A RMS load, the TO-220FPAB package requires a heatsink to maintain T_j ≤ 125 °C given its R_th(j-c) = 3.5 °C/W. At 5 A RMS with free-air convection, it may operate without heatsink depending on ambient temperature and PCB copper area.

How does the crowbar protection function during an IEC 61000-4-5 surge event?

During a 2 kV surge, the internal crowbar circuit detects voltage exceeding V_CL (≥850 V) and forces the device into low-impedance conduction for ≤10 ms, diverting surge energy through the load. It recovers blocking capability after the next zero-current crossing, enabling repeatable protection.

Can ACST10-7SFP be used in zero-crossing switched applications?

Yes-its high dV/dt immunity (>2000 V/µs) and low gate trigger threshold allow reliable zero-crossing triggering using standard opto-triac drivers or MCU-based timing circuits. The device remains immune to false turn-on from dv/dt during voltage zero crossings.

ACST10-7SFP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Triac Type:: Logic - Sensitive Gate

Voltage - Off State:: 700 V

Current - On State (It (RMS)) (Max):: 10 A

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

Current - Non Rep. Surge 50, 60Hz (Itsm):: 100A, 105A

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

Current - Hold (Ih) (Max):: 30 mA

Configuration:: Single

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

ACST10-7SFP FAQ

1.How can I place an order for ACST10-7SFP through Aetrix?

Please submit a Request for Quotation (RFQ) for ACST10-7SFP 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 ACST10-7SFP reliable?

The price and inventory of ACST10-7SFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST10-7SFP is usually 5 days.

3.What payment methods are accepted for ACST10-7SFP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST10-7SFP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ACST10-7SFP?

ACST10-7SFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ACST10-7SFP 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 ACST10-7SFP?

For technical support, including ACST10-7SFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST10-7SFP requirements.

6.How does Aetrix verify that ACST10-7SFP is sourced from the original manufacturer or authorized distributors?

All ACST10-7SFP 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 ACST10-7SFP meets industry standards.

7.What is the process for return or replacement of ACST10-7SFP?

All ACST10-7SFP units undergo pre-shipment inspection (PSI). If there is an issue with ACST10-7SFP, 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 ACST10-7SFP part is unused and in its original packaging.

Return procedure for ACST10-7SFP:

1.Submit a request within 90 days.

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

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