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STMicroelectronics ACST1010-7T
- Part No.:
- ACST1010-7T
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-220-3
- Datasheet:
-
ACST1010-7T.pdf
- Description:
- TRIAC SENS GATE 700V 10A TO220
- Quantity:
- Payment:
- Shipping:
Inventory:990
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Product details
Overview
ACST1010-7T from STMicroelectronics is a 10 A, 700 V RMS overvoltage-protected AC switch (Triac) with integrated crowbar clamping, low 10 mA gate trigger current (IGT), and TO-220AB insulated package. It drives universal motors in washing machines and compressors in refrigerators without external snubbers or transient protection, meeting IEC 61000-4-5 surge immunity requirements.
For engineers reviewing the ACST1010-7T datasheet, ACST1010-7T pinout, ACST1010-7T application, or ACST1010-7T equivalent, this device delivers verified dV/dt immunity >2000 V/µs, clamping voltage ≥850 V, and direct MCU gate drive capability-critical for robust AC mains switching in appliance control systems.
Technical Context
The ACST1010-7T integrates a planar Triac structure with an on-die overvoltage crowbar circuit that triggers into conduction during line transients (e.g., IEC 61000-4-5 2 kV surges), safely diverting energy through the load. Its gate threshold is specified at ≤1.0 V with IGT ≤10 mA at 25 °C, enabling direct drive from 3.3 V or 5 V microcontrollers via a single series resistor.
It operates across -40 to +125 °C junction temperature, sustains 105 A non-repetitive surge current (60 Hz, 20 ms), and achieves static dV/dt ≥200 V/µs at 125 °C-exceeding standard Triac performance without external protection components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 10 A - Sustains continuous sinusoidal load current up to 10 A without heatsink derating at Tc = 105 °C. |
| VDRM / VRRM | 700 V - Blocks 700 V peak AC line voltage, suitable for 230 Vrms mains with safety margin. |
| IGT (max) | 10 mA @ 25 °C - Enables direct gate drive from low-power MCU GPIOs using only a current-limiting resistor. |
| dV/dt (min) | 200 V/µs @ 125 °C - Resists false triggering from fast line noise without snubber networks. |
| VCL (min) | 850 V @ 25 °C - Clamps transients above this voltage by self-triggering, protecting downstream loads per IEC 61000-4-5. |
| Rth(j-c) | 1.7 °C/W - Enables thermal design with predictable junction-to-case temperature rise under full-load operation. |
| Insulation | Not applicable - TO-220AB package is non-insulated; insulation rating applies only to FP variants (e.g., ACST1010-7FP). |
Pinout & Package
ACST1010-7T uses the TO-220AB package: non-insulated, 3-lead, vertical mounting, epoxy body compliant with UL94 V0. Case is electrically connected to the MT2 terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MT1 | Main Terminal 1 | AC load return path; referenced to neutral or low-side of AC bridge; common connection point for bidirectional conduction. |
| MT2 | Main Terminal 2 | AC line input or high-side connection; electrically tied to metal tab in TO-220AB for thermal conduction and EMI shielding. |
| G | Gate | Low-current control input; triggers conduction when IGT ≥10 mA; polarity-insensitive for both quadrants I and III. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | Clamps transients ≥850 V by self-triggering into conduction, eliminating need for MOVs or TVS diodes. |
| Planar Triac technology | Ensures stable off-state leakage (<20 µA at 25 °C) and high reliability under repeated surge stress. |
| High dV/dt immunity | 200 V/µs minimum at 125 °C prevents false turn-on from EMI in noisy industrial environments. |
| Direct MCU gate drive | 10 mA IGT max allows use of standard 3.3 V/5 V microcontroller outputs with Rg ≈ 330 Ω–1 kΩ. |
| No external snubber required | Supports inductive loads (e.g., compressor windings) up to 10 A RMS without RC snubber networks. |
Applications
| Washing Machine Drum Motor Control | Refrigerator Compressor Drive |
|---|---|
Use Scenario: Controlling universal motor speed and direction in front-loading washing machines using phase-angle or burst-fire AC switching. IC Role / Device Role / Timing Role: AC mains switch replacing electromechanical relays; handles 10 A inductive peaks during drum spin cycles. Use Value: Eliminates relay wear-out and contact arcing; enables precise torque control and silent operation via zero-crossing or phase-controlled firing. | Use Scenario: Starting and running hermetic compressors in domestic refrigerators and freezers with high inrush current (≥5× rated). IC Role / Device Role / Timing Role: Solid-state AC switch managing full-line voltage across compressor windings; withstands 100 A surge for 20 ms per IEC 61000-4-5. Use Value: Replaces bulky relay+PTC starter assemblies; reduces board space and improves cold-start reliability at -25 °C ambient. |
| Air Conditioner Fan & Blower Control | Industrial HVAC Zone Valve Actuation |
Use Scenario: Modulating AC fan speed in split-system air conditioners using leading-edge phase control. IC Role / Device Role / Timing Role: Bidirectional AC switch interfacing between MCU and 230 Vrms fan motor; triggered synchronously to AC zero-crossing. Use Value: Achieves smooth, stepless airflow control with <1% THD; eliminates audible coil whine associated with TRIAC+snubber designs. | Use Scenario: Driving solenoid-actuated zone valves in commercial HVAC systems powered from 240 Vrms distribution panels. IC Role / Device Role / Timing Role: High-noise-immunity AC switch handling intermittent 10 A resistive-inductive loads in electrically harsh mechanical rooms. Use Value: Survives repeated 2 kV line surges from nearby contactor switching; avoids field failures requiring service calls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST1035-7T | Higher IGT (≤35 mA), same VDRM/Rth(j-c), identical package | Lower gate sensitivity but higher dV/dt immunity (2000 V/µs vs. 200 V/µs) | Select when driving from higher-voltage logic (e.g., 12 V gate drivers) or operating in ultra-high-noise environments. |
| BTB12-600CW | Standard Triac, no integrated crowbar; 12 A rating, 600 V VDRM, TO-220AB | Requires external MOV + snubber for IEC 61000-4-5 compliance | Select only if cost is primary constraint and board space allows added protection components. |
Compared with ACST1035-7T, the ACST1010-7T offers lower gate drive burden and simpler MCU interface, while BTB12-600CW lacks built-in overvoltage protection-requiring additional BOM cost and layout area for transient suppression.
Availability
ACST1010-7T is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, HVAC fan modulation, and industrial zone valve actuation requiring stable component supply and long-term production continuity.
Supply support for ACST1010-7T 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 ACST™ family was developed specifically for robust AC mains switching in white goods and industrial controls-emphasizing self-protection, reduced system-level component count, and simplified compliance with IEC electromagnetic immunity standards.
FAQ
What is the maximum allowable gate resistor value for direct MCU drive?
The ACST1010-7T requires ≤10 mA IGT at 25 °C. With a 3.3 V MCU output and 1.0 V VGT max, the maximum Rg is (3.3 V − 1.0 V) / 10 mA = 230 Ω. For margin at elevated temperature, 180 Ω is recommended. Higher values risk unreliable triggering above 85 °C junction temperature.
Does ACST1010-7T require a heat sink in 10 A continuous operation?
At 10 A RMS and Tc = 105 °C, the device dissipates ~1.5 W (VTM × IT). With Rth(j-c) = 1.7 °C/W, junction temperature rise is ~2.6 °C-well within the 125 °C limit. A heat sink is not required for TO-220AB mounted on ≥1 oz copper with ≥25 cm² pad, but recommended for sustained 10 A in enclosed enclosures above 60 °C ambient.
Can ACST1010-7T replace a mechanical relay in a 230 VAC, 8 A resistive load?
Yes-its 10 A IT(RMS), 700 V VDRM, and 105 A surge rating exceed typical 8 A relay specs. Unlike relays, it provides silent operation, infinite cycle life, and immunity to contact welding. Ensure gate drive meets IGT spec and include flyback protection if driving inductive loads like solenoids.
How does the crowbar protection behave during a 2 kV IEC 61000-4-5 surge?
During a 2 kV surge, the internal crowbar triggers the device into conduction when voltage exceeds VCL (≥850 V), clamping the transient and routing surge current through the load. The device remains latched for <10 ms, then recovers blocking capability after the next zero-crossing-no damage occurs, and normal operation resumes automatically.
ACST1010-7T 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:
- 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
ACST1010-7T FAQ
1.How can I place an order for ACST1010-7T through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST1010-7T 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 ACST1010-7T reliable?
The price and inventory of ACST1010-7T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST1010-7T is usually 5 days.
3.What payment methods are accepted for ACST1010-7T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST1010-7T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST1010-7T?
ACST1010-7T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST1010-7T 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 ACST1010-7T?
For technical support, including ACST1010-7T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST1010-7T requirements.
6.How does Aetrix verify that ACST1010-7T is sourced from the original manufacturer or authorized distributors?
All ACST1010-7T 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 ACST1010-7T meets industry standards.
7.What is the process for return or replacement of ACST1010-7T?
All ACST1010-7T units undergo pre-shipment inspection (PSI). If there is an issue with ACST1010-7T, 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 ACST1010-7T part is unused and in its original packaging.
Return procedure for ACST1010-7T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ACST1010-7T Tags
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