Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Thyristors > TRIACs

STMicroelectronics ACST10-7CT

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

Compare

Part No.:: ACST10-7CT

Manufacturer:: STMicroelectronics

Category:: TRIACs

Package:: TO-220-3

Datasheet:: ACST10-7CT.pdf

Description:: TRIAC SENS GATE 700V 10A TO220

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:811

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ACST10-7CT from STMicroelectronics is an overvoltage-protected AC switch (Triac) with integrated crowbar clamping, designed for direct mains-connected static switching in home appliances and industrial controls. It delivers 10 A RMS on-state current, 700 V blocking voltage, low gate trigger current (IGT ≤ 10 mA), and withstands 2 kV IEC 61000-4-5 line surges without external protection-enabling compressor and universal motor control in washing machines and refrigerators.

For engineers reviewing the ACST10-7CT datasheet, ACST10-7CT pinout, ACST10-7CT application, or ACST10-7CT equivalent, key selection criteria include its self-protecting VCL clamping behavior, high dV/dt immunity (>2000 V/µs), TO-220FPAB insulated package (1500 V_RMS isolation), and compatibility with MCU-level gate drive without snubbers.

Technical Context

The ACST10-7CT implements a planar Triac structure augmented with an internal overvoltage crowbar circuit that activates at ≥850 V (V_CL) to safely clamp transients or fold into conduction for high-energy surges. Its gate triggering is optimized for low-current drive (IGT ≤ 10 mA at 25 °C) while maintaining robust noise immunity via static dV/dt > 2000 V/µs at 125 °C.

Thermal design leverages TO-220FPAB's 3.5 °C/W junction-to-case resistance and 1500 V_RMS insulation, enabling reliable operation up to 125 °C junction temperature under 10 A RMS loads-even during inrush events like compressor startup-without external snubbers or MOVs.

Key Specifications

Parameter	Value and Actual Design Meaning
IT(RMS)	10 A - Sustains continuous medium-power AC loads (e.g., fridge compressors, drum motors) without derating at Tc = 84 °C.
VDRM/VRRM	700 V - Blocks standard 230 VAC mains with 3× safety margin; supports global 120–240 VAC systems.
IGT (max)	10 mA - Directly drivable by MCU GPIO via simple series resistor; eliminates need for gate driver ICs.
dV/dt (min)	2000 V/µs - Immune to fast transients per IEC 61000-4-4; prevents false turn-on in noisy industrial environments.
VCL (min)	850 V - Clamps inductive turn-off spikes and absorbs IEC 61000-4-5 2 kV surges, replacing external TVS/MOV.
Rth(j-c)	3.5 °C/W - Enables efficient heatsinking in compact appliance enclosures; supports 8 W max power dissipation at Tc = 84 °C.
VINS(RMS)	1500 V - Reinforced insulation allows safe mounting on non-isolated PCBs; meets creepage/clearance requirements for Class II appliances.

Pinout & Package

ACST10-7CT uses the TO-220FPAB insulated package: epoxy body with metal tab isolated at 1500 V_RMS, UL94 V0 rated, and 0.4–0.6 N·m mounting torque specification.

Pin/Terminal	Circuit Role	Design Meaning
COM	Common terminal (MT1)	Main terminal 1 reference; connects to neutral or one side of AC load; forms bidirectional conduction path with OUT.
OUT	Output terminal (MT2)	Main terminal 2; carries full load current (10 A RMS); voltage polarity reverses each half-cycle.
G	Gate	Low-current trigger input (≤10 mA); initiates conduction when referenced to COM; compatible with 3.3 V/5 V logic.

Key Features

Feature	Design Value
Integrated overvoltage crowbar	Clamps transients ≥850 V and switches to on-state for 2 kV surges-eliminates external MOVs and reduces BOM count.
Planar Triac technology	Ensures stable off-state leakage (<1.2 mA at 125 °C) and high reliability across 10,000+ switching cycles.
No-snubber inductive switching	Drives 10 A universal motors and compressors without RC snubbers-reduces board space and EMI filtering complexity.
MCU-compatible gate drive	10 mA IGT enables direct connection to microcontroller pins using only a current-limiting resistor (e.g., 470 Ω @ 5 V).
High thermal robustness	Rated for 125 °C junction operation with 3.5 °C/W R_th(j-c); sustains compressor inrush peaks without thermal runaway.

Applications

Washing Machine Drum Motor Control

Refrigerator Compressor Drive

Use Scenario: Precise speed and direction control of universal motors in washing machine drums during wash/spin cycles.

IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relays; triggered synchronously with zero-crossing detection for EMI reduction.

Use Value: Enables silent, wear-free commutation and programmable torque profiles-improving energy efficiency and cycle consistency.

Use Scenario: Start/stop control of hermetic compressors in refrigerators and air conditioners, handling high inrush currents.

IC Role / Device Role / Timing Role: Solid-state relay with built-in surge protection; activated during thermostat demand pulses.

Use Value: Withstands 100 A surge peaks (20 ms) and clamps inductive kickback-extending compressor lifespan and eliminating snubber components.

Industrial HVAC Fan Control

Smart Plug Load Switching

Use Scenario: Modulated AC fan speed control in commercial HVAC units using phase-angle dimming.

IC Role / Device Role / Timing Role: High-noise-immunity Triac switch; gate triggered mid-cycle to adjust power delivery.

Use Value: 2000 V/µs dV/dt rating prevents misfiring from SCR commutation noise in shared power rails.

Use Scenario: Remote-controlled on/off switching of 120/230 VAC outlets in smart home energy monitors and IoT power strips.

IC Role / Device Role / Timing Role: Isolated mains switch; driven by low-power MCU via optocoupler or direct GPIO.

Use Value: 1500 V_RMS insulation enables safe PCB layout without creepage barriers-reducing certification effort for UL/CE.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ACST1035-7FP	Higher gate trigger current (IGT ≤ 35 mA) but identical VCL, dV/dt, and package.	Better suited for noisy environments where gate signal integrity is compromised; less sensitive to ESD-induced false triggers.	Select when gate drive source has limited current capability or operates in high-EMI settings (e.g., near inverters).
L4006L6	Standard Triac (no crowbar); 6 A RMS, 600 V, requires external MOV for IEC 61000-4-5 compliance.	Lacks integrated overvoltage protection; needs additional components for surge ruggedness.	Choose only if cost sensitivity outweighs design simplification and reliability gains of ACST10-7CT.

Compared with ACST1035-7FP, ACST10-7CT offers lower gate drive burden and faster response to clean control signals; versus L4006L6, it eliminates external protection components and improves system-level surge resilience without increasing board area.

Availability

ACST10-7CT is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, and industrial HVAC fan switching requiring stable component supply across multi-year production cycles.

Supply support for ACST10-7CT 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 discrete devices, microcontrollers, and analog ICs for industrial, automotive, and consumer markets.

The ACST™ family was engineered specifically for robust AC mains switching in white goods and industrial equipment-prioritizing self-protection, thermal resilience, and MCU interoperability over generic Triac performance.

FAQ

What is the maximum surge current the ACST10-7CT can handle?

The ACST10-7CT withstands non-repetitive surge currents up to 100 A (20 ms, 50 Hz sine wave) at Tj = 25 °C. Its I²t rating is 66 A²s for fuse coordination. This enables reliable handling of compressor inrush and transformer energization transients without degradation.

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

Yes-when operating continuously at ≥6 A RMS, a heatsink is required to maintain Tj ≤ 125 °C due to its 3.5 °C/W R_th(j-c). At 10 A RMS, case temperature must be held ≤84 °C; common aluminum extrusions (e.g., 50 × 50 × 10 mm) suffice for intermittent duty in washing machines.

Can ACST10-7CT replace a mechanical relay in smart plug designs?

Yes-it replaces SPST relays driving ≤10 A resistive or inductive loads, offering silent operation, infinite lifetime, and zero-contact bounce. Its 1500 V_RMS isolation and self-clamping eliminate relay arcing risks and external transient suppressors required in relay-based designs.

How does the crowbar protection differ from standard MOV-based solutions?

Unlike MOVs-which degrade after repeated surges-the ACST10-7CT's crowbar is solid-state and fully recoverable: it clamps low-energy spikes or latches briefly (<10 ms) for high-energy surges, then resets automatically at the next zero-crossing. This ensures consistent protection over the product's full service life without parameter drift.

ACST10-7CT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

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-220

ACST10-7CT FAQ

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

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

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

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your ACST10-7CT 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 ACST10-7CT?

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

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

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

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

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

Return procedure for ACST10-7CT:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…