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STMicroelectronics ACST12-7CG-TR
- Part No.:
- ACST12-7CG-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST12-7CG-TR.pdf
- Description:
- TRIAC 700V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
ACST12-7CG-TR from STMicroelectronics is a transient-protected AC power switch integrating a 12 A TRIAC with overvoltage crowbar clamping (VCL = 850 V) and 2000 V/µs static dV/dt immunity. It operates at 700 V repetitive peak off-state voltage, requires ≤35 mA gate trigger current (IGT), and uses planar technology for high off-state reliability in mains-connected appliance control. It drives universal drum motors and compressor loads without external snubbers.
For engineers reviewing the ACST12-7CG-TR datasheet, ACST12-7CG-TR pinout, ACST12-7CG-TR application, or ACST12-7CG-TR equivalent, this device is selected for IEC 61000-4-4/4-5-compliant AC static switching where self-protected turn-off energy absorption, low gate drive burden, and D²PAK thermal performance are critical.
Technical Context
The ACST12-7CG-TR combines a bidirectional TRIAC structure with an integrated high-voltage clamping device that activates during line transients-either clamping low-energy spikes or crowbarring into conduction for ≤10 ms to dissipate high-energy surges per IEC 61000-4-5. Its planar junction ensures stable blocking behavior up to 125 °C junction temperature.
It supports direct MCU gate drive via a single series resistor due to its ≤35 mA IGT and maintains ≥2000 V/µs static dV/dt immunity even at Tj = 125 °C. The D²PAK package delivers Rth(j-c) = 1.5 °C/W and Rth(j-a) = 45 °C/W (with 1 cm² Cu), enabling 12 A RMS operation at 47 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Sustains continuous sinusoidal load current up to 12 A without heatsink derating at Tc = 104 °C |
| VDRM/VRRM | 700 V - Blocks 700 V peak AC line voltage in both directions, suitable for 230 VAC mains systems |
| IGT (max) | 35 mA - Gate trigger current threshold for ACST12-7C variant; enables direct drive from standard GPIO pins |
| dV/dt (min) | 2000 V/µs - Immune to fast transients per IEC 61000-4-4, eliminating need for RC snubbers in many designs |
| VCL | 850 V - Clamping voltage at ICL = 0.1 mA; absorbs surge energy by crowbar action per IEC 61000-4-5 |
| Rd (max) | 30 mΩ - Low on-state dynamic resistance minimizes conduction loss and self-heating at full load |
| Rth(j-c) | 1.5 °C/W - Junction-to-case thermal resistance enables efficient heat transfer to PCB copper or heatsink |
Pinout & Package
D²PAK (TO-263) surface-mount package with isolated tab; thermally optimized for PCB copper area (1 cm² recommended); UL94 V0 epoxy; lead-free second-level interconnect (ECOPACK®).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Low-current control input; triggers conduction in all quadrants with ≤35 mA; referenced to COM |
| OUT | Main output terminal (anode 2) | Carries full load current (12 A RMS); bidirectional conduction path with COM |
| COM | Common terminal (anode 1 / MT1) | Reference node for gate drive and load return; forms main current path with OUT |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar protection | Self-activates during IEC 61000-4-5 surges up to 2 kV, eliminating discrete MOVs or TVS diodes |
| High noise immunity | 2000 V/µs static dV/dt ensures reliable blocking under EMI-rich industrial environments |
| No external snubber required | Robust commutation allows direct driving of inductive 12 A loads (e.g., compressor motors) without RC networks |
| MCU-compatible gate drive | ≤35 mA IGT enables direct connection to microcontroller GPIO through a single current-limiting resistor |
| Planar junction technology | Guarantees stable off-state leakage (<1.5 mA at 125 °C) and long-term reliability in thermal cycling |
Applications
| Washing Machine Drum Motor Control | Refrigerator Compressor Switching |
|---|---|
|
Use Scenario: Universal motor speed and direction control in front-load washing machines using phase-angle or burst-fire AC switching. IC Role / Device Role / Timing Role: AC power switch replacing mechanical relays; handles 12 A inrush and continuous torque load without contact wear. Use Value: Eliminates relay bounce and arcing; reduces system BOM count by removing snubbers and external transient suppressors. |
Use Scenario: Start/run control of hermetic compressors in domestic refrigerators and freezers. IC Role / Device Role / Timing Role: Solid-state AC mains switch providing zero-crossing or random-phase turn-on with surge resilience. Use Value: Withstands compressor inrush currents and line transients per IEC 61000-4-5 without failure or degradation. |
| Air Conditioner Fan Motor Control | Industrial HVAC Blower Systems |
|
Use Scenario: Speed-regulated AC induction fan motor in split-system air conditioners. IC Role / Device Role / Timing Role: High-reliability AC load switch interfacing with MCU-based motor control logic. Use Value: Enables compact, silent, maintenance-free motor control with built-in 2 kV surge withstand capability. |
Use Scenario: Mains-powered blower control in commercial HVAC units requiring CE/UL compliance. IC Role / Device Role / Timing Role: Transient-hardened AC power switch for 230 VAC/12 A loads in harsh electromagnetic environments. Use Value: Meets IEC 61000-4-4 immunity and IEC 61000-4-5 surge robustness without design margin compromises. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST12-7CT | Same electrical specs but TO-220AB through-hole package; Rth(j-c) = 1.5 °C/W identical, but Rth(j-a) = 60 °C/W vs. 45 °C/W | Preferred for prototyping or low-volume assemblies where manual soldering or heatsink mounting is used | Select when board space permits larger footprint and thermal path relies on external heatsink rather than PCB copper |
| ACS108-7SN | Lower 8 A rating; 1000 V/µs dV/dt; no integrated crowbar (requires external MOV); D²PAK package | Suitable only for non-surge-critical 230 VAC loads below 8 A RMS with external protection | Choose only if cost sensitivity outweighs surge immunity requirements and load current stays ≤8 A |
Compared with ACST12-7CT, the -7CG-TR offers superior PCB thermal management and automated assembly compatibility; versus ACS108-7SN, it provides essential self-protection for compressor and motor inrush events without added components.
Availability
ACST12-7CG-TR is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor switching, and HVAC blower systems requiring stable component supply, long-lifecycle support, and IEC-compliant transient resilience.
Supply support for ACST12-7CG-TR 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 industrial, automotive, and consumer markets.
The ACST/ACST12 family is part of ST's Application-Specific Discrete (ASD) portfolio, engineered specifically for robust, self-protected AC mains switching in white goods and industrial controls where reliability under surge and thermal stress is mandatory.
FAQ
What is the maximum continuous load current the ACST12-7CG-TR can switch?
The ACST12-7CG-TR is rated for 12 A RMS continuous current when mounted on a PCB with ≥1 cm² of 35 µm copper (Rth(j-a) = 45 °C/W) and ambient temperature ≤47 °C. At higher ambient temperatures or reduced copper area, derating per Figure 4 applies. Peak non-repetitive surge current reaches 120 A (50 Hz, 20 ms).
Does the ACST12-7CG-TR require an external snubber circuit?
No. The device's integrated overvoltage crowbar and high commutation robustness (di/dt ≥14 A/ms without snubber) allow direct switching of inductive 12 A loads-including universal motors and compressors-without external RC snubbers. This is validated per IEC 61000-4-4 and 4-5 test conditions in the datasheet.
How does the crowbar protection function during a surge event?
When line voltage exceeds ~850 V (VCL), the internal clamping device triggers the TRIAC into conduction for ≤10 ms, diverting surge energy through the load instead of failing open. After the transient, the device recovers full blocking capability. This behavior is verified for ≥10 repetitive 2 kV surges per polarity per IEC 61000-4-5.
Can the ACST12-7CG-TR be driven directly by a 3.3 V microcontroller GPIO?
Yes. With IGT ≤35 mA and VGT ≤1.0 V, a standard 3.3 V MCU GPIO can drive the gate through a 100 Ω series resistor (delivering ~30 mA), satisfying triggering requirements across temperature. Layout must minimize gate loop inductance to preserve dV/dt immunity.
ACST12-7CG-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Triac Type:
- Standard
- Voltage - Off State:
- 700 V
- Current - On State (It (RMS)) (Max):
- 12 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 120A, 126A
- Current - Gate Trigger (Igt) (Max):
- 35 mA
- Current - Hold (Ih) (Max):
- 50 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
ACST12-7CG-TR FAQ
1.How can I place an order for ACST12-7CG-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST12-7CG-TR 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 ACST12-7CG-TR reliable?
The price and inventory of ACST12-7CG-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST12-7CG-TR is usually 5 days.
3.What payment methods are accepted for ACST12-7CG-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST12-7CG-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST12-7CG-TR?
ACST12-7CG-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST12-7CG-TR 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 ACST12-7CG-TR?
For technical support, including ACST12-7CG-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST12-7CG-TR requirements.
6.How does Aetrix verify that ACST12-7CG-TR is sourced from the original manufacturer or authorized distributors?
All ACST12-7CG-TR 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 ACST12-7CG-TR meets industry standards.
7.What is the process for return or replacement of ACST12-7CG-TR?
All ACST12-7CG-TR units undergo pre-shipment inspection (PSI). If there is an issue with ACST12-7CG-TR, 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 ACST12-7CG-TR part is unused and in its original packaging.
Return procedure for ACST12-7CG-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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