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STMicroelectronics ACST12-7CG
- Part No.:
- ACST12-7CG
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST12-7CG.pdf
- Description:
- TRIAC 700V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:2,327
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Product details
Overview
ACST12-7CG from STMicroelectronics is a transient-protected AC power switch integrating a 12 A TRIAC with overvoltage crowbar clamping (VCL = 850 V) and high static dV/dt immunity (2000 V/µs). It operates at 700 V repetitive peak off-state voltage, requires ≤10 mA gate trigger current (IGT), and uses planar technology for high off-state reliability in mains-connected appliance control.
For engineers reviewing the ACST12-7CG datasheet, ACST12-7CG pinout, ACST12-7CG application, or ACST12-7CG equivalent, this device serves as a self-protected AC load switch eliminating external MOVs or snubbers in compressor and universal motor drive circuits compliant with IEC 61000-4-4/4-5.
Technical Context
The ACST12-7CG implements an integrated crowbar protection architecture that switches to conduction during line transients ≥2 kV (per IEC 61000-4-5), clamping voltage to 850 V while dissipating surge energy through the load. Its planar TRIAC structure enables stable blocking up to 700 V with IDRM <20 µA at 25 °C and <1.5 mA at 125 °C.
It supports direct MCU gate drive via a single series resistor due to low IGT (≤10 mA) and high noise immunity (dV/dt > 2000 V/µs at 125 °C), and sustains 126 A non-repetitive surge (60 Hz, 16.7 ms) without failure under Tj = 25 °C initial conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Sustains continuous sinusoidal load current up to 12 A without heatsink derating beyond Tc = 104 °C |
| VDRM / VRRM | 700 V - Blocks 700 V peak AC line voltage in both directions, enabling direct mains connection in 230 VAC systems |
| IGT (max) | 10 mA - Gate trigger current threshold low enough for direct drive from 3.3 V or 5 V MCU GPIO with Rg ≤ 1 kΩ |
| dV/dt (min) | 2000 V/µs - Immune to fast transients per IEC 61000-4-4, eliminating need for gate shielding or RC filters |
| VCL | 850 V - Clamps overvoltage surges to safe level before destructive breakdown, meeting IEC 61000-4-5 Level 4 |
| Rd (max) | 30 mΩ - Low on-state resistance minimizes conduction loss (≤1.5 V VTM at 17 A), reducing thermal stress in 12 A loads |
| Rth(j-c) | 1.5 °C/W - Junction-to-case thermal resistance enables efficient heat transfer to heatsink in D²PAK package |
Pinout & Package
D²PAK (TO-263) surface-mount package with isolated tab; thermally optimized for PCB copper area ≥1 cm²; UL94 V0 epoxy; lead-free second-level interconnect (ECOPACK®).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Low-current control input; triggers conduction when IGT ≥10 mA; referenced to COM; compatible with standard logic-level drivers |
| OUT | Main output terminal (MT2) | Carries full load current (12 A RMS); connected to AC load; polarity agnostic for bidirectional conduction |
| COM | Common terminal (MT1) | Reference node for gate and load return path; tied to AC line neutral or one side of bridge rectifier in phase-control topologies |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | Clamps 2 kV IEC 61000-4-5 surges to 850 V and recovers blocking capability post-event-no external MOV required |
| High dV/dt immunity | 2000 V/µs minimum at 125 °C ensures reliable turn-off in noisy industrial environments without false triggering |
| Planar TRIAC structure | Delivers <20 µA off-state leakage at 25 °C and <1.5 mA at 125 °C, enabling stable zero-crossing detection and long-term reliability |
| Direct MCU gate drive | 10 mA max IGT allows use of standard microcontroller GPIO pins with only a series gate resistor (e.g., 470 Ω @ 5 V) |
| No snubber requirement | Supports inductive load switching (e.g., compressor, drum motor) up to 12 A without external RC snubber network |
Applications
| Washing Machine Drum Motor Control | Refrigerator Compressor Drive |
|---|---|
|
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 steady-state current; provides zero-voltage turn-on timing via MCU-synchronized gate pulses. Use Value: Eliminates relay wear-out and contact arcing; reduces EMI vs. standard TRIACs due to controlled dv/dt and integrated clamping. |
Use Scenario: Start/run control of hermetic compressors in refrigerators and air conditioners, managing high inrush (≥6× rated) and torque transients. IC Role / Device Role / Timing Role: Solid-state AC switch enabling soft-start sequencing and overload-safe shutdown; withstands 126 A surge without failure. Use Value: Replaces discrete TRIAC + MOV + snubber, cutting BOM count by ≥3 components while improving IEC 61000-4-5 compliance margin. |
| Industrial AC Load Sequencing | Smart Appliance Mains Interface |
|
Use Scenario: Sequential activation of multiple 230 VAC heating elements or solenoid valves in programmable logic controllers (PLCs) and panel-mounted controllers. IC Role / Device Role / Timing Role: Isolated AC switching element with galvanic separation between control (G) and power (COM/OUT) terminals; supports TTL-compatible timing signals. Use Value: Enables compact, high-density I/O modules with 12 A per channel and built-in surge resilience-no external protection needed per channel. |
Use Scenario: Mains-connected smart home devices (e.g., Wi-Fi enabled ovens, dishwashers) requiring certified EMC robustness and field-replaceable solid-state switching. IC Role / Device Role / Timing Role: Primary AC mains switch with embedded crowbar protection; interfaces directly to isolation amplifier or optocoupler outputs. Use Value: Meets Class B EMC requirements out-of-box; simplifies certification by removing variability from external transient suppressors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST12-7SG | D²PAK package, same electrical specs (IGT ≤10 mA, VCL = 850 V), identical thermal resistance (Rth(j-c) = 1.5 °C/W) | Tape-and-reel packaging (1000 pcs) vs. tube (50 pcs); identical board layout and thermal design | Select ACST12-7SG-TR for automated SMT production; ACST12-7CG is tube-packaged for prototyping or low-volume assembly |
| ACST12-7CT | TO-220AB through-hole package; higher Rth(j-c) = 1.5 °C/W but larger heatsink interface; same IGT, VCL, and dV/dt | Requires drilled PCB and mechanical mounting; better suited for high-vibration or serviceable industrial enclosures | Choose ACST12-7CT where manual servicing, thermal mass, or legacy footprint compatibility is prioritized over space efficiency |
Compared with ACST12-7SG and ACST12-7CT, the ACST12-7CG offers identical electrical performance in a surface-mount D²PAK format optimized for compact, high-density PCB layouts-ideal for modern white goods control boards where automated assembly and thermal management via copper pour are critical.
Availability
ACST12-7CG is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, and industrial AC load sequencing requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for ACST12-7CG 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/ACST12 family is part of ST's Application-Specific Discrete (ASD) portfolio, engineered specifically for robust, self-protected AC switching in home appliances and industrial controls-replacing electromechanical relays and unprotected TRIACs.
FAQ
What is the maximum surge current the ACST12-7CG can withstand?
The ACST12-7CG sustains a non-repetitive surge current of 120 A at 50 Hz (20.0 ms) or 126 A at 60 Hz (16.7 ms) with Tj initial = 25 °C. This rating is validated per IEC 61000-4-5 test conditions and assumes proper PCB copper area (≥1 cm²) for thermal dissipation.
Does the ACST12-7CG require an external snubber circuit for inductive loads?
No. The ACST12-7CG eliminates the need for external RC snubbers when driving inductive loads up to 12 A RMS-including universal motors and compressors-due to its integrated crowbar clamping and high commutation robustness (di/dt ≥5.3 A/ms without snubber).
How does the crowbar protection function during a voltage transient?
When line voltage exceeds VCL (850 V), the internal clamping device activates, switching the device into conduction for <10 ms to shunt surge energy through the load. After the transient, it fully recovers blocking capability-verified for ≥10 cycles per polarity per IEC 61000-4-5.
Can the ACST12-7CG be driven directly by a 3.3 V microcontroller?
Yes. With IGT ≤10 mA and VGT ≤1.0 V, a 3.3 V MCU GPIO can drive the gate directly using a 330 Ω series resistor, delivering ~10 mA peak current while staying within PG(AV) = 0.1 W and PGM = 10 W limits for pulse durations ≤20 µs.
ACST12-7CG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ACST12-7CG through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST12-7CG 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 reliable?
The price and inventory of ACST12-7CG 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 is usually 5 days.
3.What payment methods are accepted for ACST12-7CG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST12-7CG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST12-7CG?
ACST12-7CG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST12-7CG 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?
For technical support, including ACST12-7CG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST12-7CG requirements.
6.How does Aetrix verify that ACST12-7CG is sourced from the original manufacturer or authorized distributors?
All ACST12-7CG 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 meets industry standards.
7.What is the process for return or replacement of ACST12-7CG?
All ACST12-7CG units undergo pre-shipment inspection (PSI). If there is an issue with ACST12-7CG, 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 part is unused and in its original packaging.
Return procedure for ACST12-7CG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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