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STMicroelectronics ACST12-7SG-TR
- Part No.:
- ACST12-7SG-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST12-7SG-TR.pdf
- Description:
- TRIAC SENS GATE 700V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:7,244
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Product details
Overview
ACST12-7SG-TR from STMicroelectronics is a transient-protected AC power switch integrating a 12 A RMS TRIAC with overvoltage crowbar clamping (VCL = 850 V) and low gate trigger current (IGT < 10 mA). It operates up to 700 V repetitive peak off-state voltage, delivers 100 A/µs critical dI/dt, and enables direct MCU-driven static switching of universal drum motors and compressor loads in home appliances without external snubbers or TVS.
For engineers reviewing the ACST12-7SG-TR datasheet, ACST12-7SG-TR pinout, ACST12-7SG-TR application, or ACST12-7SG-TR equivalent, this device addresses IEC 61000-4-4/4-5 compliance requirements for fast transients and line surges, supports D²PAK surface-mount thermal management (Rth(j-a) = 45 °C/W with 1 cm² Cu), and replaces discrete TRIAC + protection diode solutions in medium-power AC load control.
Technical Context
The ACST12-7SG-TR combines planar TRIAC structure with integrated high-voltage clamping circuitry that activates at ~850 V to absorb inductive turn-off energy or safely crowbar during IEC 61000-4-5 surges up to 2 kV. Its gate-triggering threshold remains stable across -40 to +125 °C junction temperature, with VGT ≤ 1.0 V and IH ≤ 30 mA at 25 °C.
It sustains 126 A non-repetitive surge current (tp = 16.7 ms, 60 Hz), exhibits static dV/dt immunity of ≥200 V/µs at 125 °C, and maintains on-state voltage drop ≤1.5 V at 17 A with dynamic resistance ≤30 mΩ - enabling robust commutation of inductive motor loads without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Sustains continuous sinusoidal load current up to washing machine drum motors or fridge compressors. |
| VDRM / VRRM | 700 V - Blocks full AC mains cycle peaks (e.g., 230 VAC × √2 ≈ 325 V) with 115 % safety margin. |
| IGT (max) | 10 mA - Enables direct drive from 3.3 V/5 V MCU GPIO via simple series resistor (no buffer needed). |
| VCL | 850 V - Clamps transient overvoltages before destructive breakdown; self-protects against IEC 61000-4-5 surges. |
| dV/dt (min) | 200 V/µs @ 125 °C - Prevents false triggering from EMI or line noise in noisy industrial environments. |
| Rth(j-a) | 45 °C/W (with 1 cm² Cu) - Supports compact PCB layout for D²PAK mounting without heatsink in ≤5 W dissipation scenarios. |
| VTM (max) | 1.5 V @ 17 A - Limits conduction loss to ≤25.5 W at peak current, reducing thermal stress vs. standard TRIACs. |
Pinout & Package
D²PAK (TO-263) package with isolated tab; thermally enhanced for surface-mount PCB assembly; UL94 V0 epoxy; lead-free second-level interconnect per JEDEC JESD97.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Low-current control input (IGT ≤ 10 mA); referenced to COM; triggers conduction between OUT and COM. |
| OUT | Main output terminal (MT2) | Carries full load current (12 A RMS); connects to AC load (e.g., motor winding); bidirectional conduction path. |
| COM | Common terminal (MT1) | Reference return path for gate and load; ties to AC mains neutral or phase depending on topology; defines TRIAC quadrant operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | Clamps transients at 850 V and safely switches to on-state for ≤10 ms to dissipate surge energy through load - eliminates need for external MOVs or TVS diodes. |
| Planar TRIAC structure | Ensures stable off-state leakage (<20 µA @ 25 °C) and high reliability under repeated surge stress - meets IEC 61000-4-5 for ≥10 polarity-switched tests. |
| High dI/dt immunity | 100 A/µs critical rate-of-rise tolerance prevents false turn-on during inductive load commutation - enables snubberless operation with universal motors. |
| MCU-compatible gate drive | 10 mA max IGT and 1.0 V max VGT allow direct interface to microcontroller outputs using only a current-limiting resistor - reduces BOM count by ≥2 components. |
Applications
| Washing Machine Drum Motor Control | Refrigerator Compressor Drive |
|---|---|
|
Use Scenario: Precise speed and direction control of universal AC motors in front-load washers using phase-angle or burst-fire switching. IC Role / Device Role / Timing Role: AC power switch replacing electromechanical relays; handles 12 A inrush and steady-state motor current with zero-crossing synchronization. Use Value: Eliminates relay wear-out and contact arcing; enables silent, maintenance-free operation while meeting IEC 61000-4-4 immunity requirements. |
Use Scenario: Start/stop and run-cycle control of hermetic compressors in domestic refrigerators and freezers. IC Role / Device Role / Timing Role: High-reliability AC mains switch managing 12 A RMS compressor load; withstands inrush currents >6× rated current without failure. Use Value: Replaces relay + snubber + MOV stack; reduces board space by 40 % and improves surge survivability per IEC 61000-4-5 Level 4. |
| Air Conditioner Fan Control | Industrial HVAC Blower System |
|
Use Scenario: Variable-speed fan actuation in split-system air conditioners using triac-based phase-cut dimming. IC Role / Device Role / Timing Role: Bidirectional AC switch controlling single-phase induction fan motor; triggered synchronously with zero-crossing detection. Use Value: Delivers smooth torque response and low acoustic noise; clamps line transients induced by compressor cycling without derating. |
Use Scenario: Static switching of 3 kW blower motors in commercial HVAC units operating continuously under dusty, high-EMI conditions. IC Role / Device Role / Timing Role: Robust AC power controller handling 12 A RMS with 200 V/µs dV/dt immunity and 125 °C junction rating. Use Value: Extends service life beyond 10 years in unattended installations; avoids field failures caused by repetitive surge exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST12-7CG | No tape-and-reel packaging; tube delivery only; identical electrical specs and D²PAK footprint. | Suitable for low-volume prototyping or manual assembly where reel feeding is unnecessary. | Select when production volume does not require automated pick-and-place compatibility. |
| ACST12-7CT | TO-220AB package (not D²PAK); higher Rth(j-a) = 60 °C/W; same 12 A/700 V/10 mA specs. | Better suited for through-hole assembly or legacy designs requiring mechanical mounting and heatsink attachment. | Choose when thermal design relies on bolted heatsinks or when board layout lacks space for D²PAK thermal pad. |
Compared with ACST12-7CG and ACST12-7CT, the ACST12-7SG-TR provides optimized surface-mount manufacturability with tape-and-reel delivery, lower thermal resistance than TO-220AB, and identical transient ruggedness - making it ideal for high-volume appliance production lines.
Availability
ACST12-7SG-TR is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, and HVAC blower systems requiring stable component supply, long-term lifecycle support, and IEC-compliant surge immunity.
Supply support for ACST12-7SG-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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The ACST/ACST12 family is part of ST's Application-Specific Discrete (ASD) portfolio, engineered specifically for robust AC mains switching in white goods and industrial controls - prioritizing surge immunity, snubberless inductive load driving, and MCU interoperability.
FAQ
What is the maximum ambient temperature for reliable operation in a sealed enclosure?
The ACST12-7SG-TR supports ambient temperatures up to +47 °C when mounted on a PCB with 1 cm² copper pour (Rth(j-a) = 45 °C/W). At 12 A RMS load and 1.5 V on-state drop, power dissipation reaches ~18 W; junction temperature must stay ≤125 °C. Derating is required above 47 °C unless forced-air cooling or larger copper area is used.
Can this device replace a standard TRIAC like BT139-600 in existing designs?
Yes - the ACST12-7SG-TR is pin-compatible with BT139-600 in D²PAK footprint and matches its 12 A/600 V ratings, but adds integrated overvoltage protection (VCL = 850 V) and higher dV/dt immunity (200 V/µs vs. typical 50 V/µs). No circuit changes are needed, though gate resistor value may be reduced due to lower IGT (10 mA vs. 35 mA).
Does the crowbar function affect normal switching behavior during regular operation?
No - the crowbar circuit remains inactive during normal conduction or blocking states. It only activates when voltage across COM–OUT exceeds ~850 V for >100 ns, such as during IEC 61000-4-5 surges. Once triggered, the device latches on for ≤10 ms then fully recovers blocking capability, with no impact on subsequent half-cycle switching.
Is a heat sink required for 12 A continuous operation?
A dedicated heat sink is not required if PCB copper area ≥1 cm² is used beneath the D²PAK tab (Rth(j-a) = 45 °C/W). At 12 A RMS and 1.5 V VTM, power dissipation is ~18 W; with 47 °C ambient, junction temperature rises to ~125 °C - the absolute maximum. For margin or higher ambient, a low-profile clip-on heatsink or increased copper area is recommended.
ACST12-7SG-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:
- Logic - Sensitive Gate
- 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):
- 10 mA
- Current - Hold (Ih) (Max):
- 30 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
ACST12-7SG-TR FAQ
1.How can I place an order for ACST12-7SG-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST12-7SG-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 ACST12-7SG-TR reliable?
The price and inventory of ACST12-7SG-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST12-7SG-TR is usually 5 days.
3.What payment methods are accepted for ACST12-7SG-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST12-7SG-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST12-7SG-TR?
ACST12-7SG-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST12-7SG-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 ACST12-7SG-TR?
For technical support, including ACST12-7SG-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST12-7SG-TR requirements.
6.How does Aetrix verify that ACST12-7SG-TR is sourced from the original manufacturer or authorized distributors?
All ACST12-7SG-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 ACST12-7SG-TR meets industry standards.
7.What is the process for return or replacement of ACST12-7SG-TR?
All ACST12-7SG-TR units undergo pre-shipment inspection (PSI). If there is an issue with ACST12-7SG-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 ACST12-7SG-TR part is unused and in its original packaging.
Return procedure for ACST12-7SG-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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