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STMicroelectronics ACST1235-7G
- Part No.:
- ACST1235-7G
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST1235-7G.pdf
- Description:
- TRIAC 700V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,469
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Product details
Overview
ACST1235-7G from STMicroelectronics is a 12 A, 700 V overvoltage-protected AC switch (Triac with integrated crowbar clamping), designed for direct control of inductive AC loads such as compressor motors and universal drum motors in home appliances. It delivers 2 kV/µs static dV/dt immunity at 125 °C, supports IEC 61000-4-4/4-5 compliance without external protection, and uses planar technology for high off-state reliability.
For engineers reviewing the ACST1235-7G datasheet, ACST1235-7G pinout, ACST1235-7G application, or ACST1235-7G equivalent, this device is selected for robust mains switching where transient immunity, snubberless operation, gate drive simplicity, and thermal stability under inrush conditions are critical design requirements.
Technical Context
The ACST1235-7G integrates a Triac structure with an on-chip high-voltage clamping device that activates during line transients-either clamping low-energy spikes or crowbar-triggering into conduction for ≤10 ms to safely dissipate high-energy surges per IEC 61000-4-5. Its 2000 V/µs dV/dt rating is guaranteed at 125 °C with gate open.
It operates in quadrants I, II, and III with 35 mA maximum gate trigger current (IGT), 850 V minimum clamping voltage (VCL) at 25 °C, and 30 mΩ dynamic resistance (Rd) at 125 °C-enabling snubberless switching of 12 A RMS inductive loads like fridge compressors and washing machine motors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Supports continuous switching of medium-power AC loads up to compressor-level inrush. |
| VDRM/VRRM | 700 V - Blocks full AC mains peaks (e.g., 230 VAC + margin) without breakdown. |
| dV/dt (static) | 2000 V/µs min @ 125 °C - Eliminates false triggering from fast transients in noisy industrial/appliance environments. |
| IGT | 35 mA max - Compatible with standard logic-level gate drivers; higher than ACST1210-7 for enhanced noise margin. |
| VCL | 850 V min @ 25 °C - Clamps line transients before destructive overvoltage occurs; enables self-protected operation. |
| Rd | 30 mΩ max @ 125 °C - Limits conduction loss and thermal rise during sustained 12 A load current. |
| ITSM (50 Hz) | 120 A @ 20 ms - Withstands compressor startup surges without failure. |
Pinout & Package
D2PAK (TO-263) package: surface-mount, isolated tab, thermally optimized for PCB copper area (Rth(j-a) = 45 °C/W with 1 cm² Cu), UL94 V0 epoxy, ECOPACK® compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Low-current trigger input (≤35 mA); referenced to COM; controls Triac conduction onset. |
| OUT | Main output terminal (anode side) | Carries full load current (12 A RMS); connects to AC load (e.g., motor winding). |
| COM | Common terminal (cathode side) | Return path for load current; electrically tied to heatsink/tab; defines reference for gate and voltage clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Overvoltage crowbar protection | Self-activating clamping or crowbar mode handles IEC 61000-4-5 2 kV surges without external components. |
| Snubberless inductive switching | Supports direct drive of 12 A universal motors and compressors without RC snubber networks. |
| High-temperature dV/dt immunity | 2000 V/µs minimum at 125 °C ensures stable operation in hot appliance enclosures. |
| Planar Triac structure | Delivers high off-state reliability and low leakage (<1.5 mA @ 125 °C) across lifetime. |
| ECOPACK® packaging | D2PAK meets RoHS, halogen-free, and UL94 V0 flammability standards for global appliance compliance. |
Applications
| Refrigerator Compressor Control | Washing Machine Drum Motor |
|---|---|
Use Scenario: Direct switching of hermetic compressor motor during start/stop cycles, including high inrush currents and thermal cycling. IC Role / Device Role / Timing Role: AC mains switch replacing electromechanical relays; provides zero-crossing–compatible turn-on and transient-robust turn-off. Use Value: Eliminates relay wear-out and contact arcing; withstands 120 A surge (20 ms) and recovers after IEC 61000-4-5 surges without latch-up. | Use Scenario: Bidirectional speed and direction control of universal motor driving washing machine drum via phase-angle or burst-fire dimming. IC Role / Device Role / Timing Role: Solid-state AC power switch enabling precise motor torque regulation without mechanical wear. Use Value: 2 kV/µs dV/dt immunity prevents false triggering from motor commutation noise; 30 mΩ Rd minimizes heat generation during extended spin cycles. |
| Air Conditioner Fan Control | Industrial AC Load Sequencing |
Use Scenario: Mains-powered fan motor control in split-system AC units, subject to grid fluctuations and HVAC system transients. IC Role / Device Role / Timing Role: Primary AC switching element interfacing MCU GPIO through simple series resistor; handles 12 A RMS continuously. Use Value: Integrated VCL ≥850 V clamps inductive kickback from fan windings; eliminates need for MOVs or TVS diodes. | Use Scenario: Programmable sequencing of multiple 120/230 VAC industrial heaters, solenoids, or lighting banks in PLC-controlled panels. IC Role / Device Role / Timing Role: High-reliability, thermally stable AC switch for BOM consolidation in DIN-rail mounted control modules. Use Value: TO-220AB/D2PAK footprint compatibility allows drop-in replacement; Rth(j-c) = 1.5 °C/W enables compact heatsinking in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST1210-7G | Lower IGT (10 mA max) but reduced dV/dt (200 V/µs), same VDRM/RMS rating. | Better suited for low-power MCU-driven loads where gate drive strength is limited. | Select when gate driver output is weak (<10 mA), not when high noise immunity is required. |
| BTB12-700CW | Standard Triac (no crowbar), 12 A/700 V, dV/dt = 1000 V/µs, requires external snubber and MOV. | Requires additional protection components and layout area; lower surge ruggedness. | Select only if cost sensitivity outweighs reliability and BOM simplification goals. |
Compared with ACST1210-7G, the ACST1235-7G trades higher gate drive demand for 10× dV/dt immunity-critical in noisy compressor environments; versus BTB12-700CW, it eliminates external protection while delivering superior IEC 61000-4-5 compliance out-of-the-box.
Availability
ACST1235-7G is available at Aetrix Electronics and suitable for refrigerator compressor control, washing machine motor drives, air conditioner fan regulation, and industrial AC load sequencing requiring stable component supply and long-term lifecycle support.
Supply support for ACST1235-7G 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, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The ACST™/ACST family is part of ST's Application-Specific Discrete (A.S.D.®) portfolio, engineered specifically for robust, snubberless AC mains switching in white goods and industrial controls-prioritizing surge resilience, thermal stability, and system-level BOM reduction.
FAQ
What is the maximum allowable junction temperature for continuous operation?
The ACST1235-7G has an operating junction temperature range of –40 °C to +125 °C. Continuous operation at 125 °C is permitted provided thermal design maintains Tj ≤ 125 °C under worst-case ambient and load conditions, verified using Rth(j-c) = 1.5 °C/W (D2PAK) and appropriate PCB copper area.
Can ACST1235-7G replace a standard Triac without circuit modifications?
Yes-when used in snubberless configurations-but gate drive must supply ≥35 mA peak (not just 10 mA), and layout must accommodate its D2PAK thermal pad. Unlike standard Triacs, it does not require external MOVs or RC snubbers for IEC 61000-4-5 compliance, simplifying redesign.
How does the overvoltage crowbar function during a 2 kV surge event?
During a 2 kV/1.2–50 µs surge, the internal clamping device triggers the Triac into conduction for <10 ms, diverting surge energy through the load instead of breaking down. After current crosses zero, the device recovers full blocking capability (700 V) without damage or parameter shift.
Is ACST1235-7G certified for IEC 61000-4-4 and IEC 61000-4-5 compliance?
Yes-the device is characterized to meet both standards: static dV/dt ≥2000 V/µs satisfies IEC 61000-4-4 Level 4, and successful 2 kV surge testing per Figure 19 of IEC 61000-4-5 confirms system-level immunity when used with typical load impedance and PCB layout per ST's application notes.
ACST1235-7G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ACS™/A.S.D®
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tube
- Product Status:
- Active
- 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
ACST1235-7G FAQ
1.How can I place an order for ACST1235-7G through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST1235-7G 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 ACST1235-7G reliable?
The price and inventory of ACST1235-7G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST1235-7G is usually 5 days.
3.What payment methods are accepted for ACST1235-7G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST1235-7G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST1235-7G?
ACST1235-7G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST1235-7G 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 ACST1235-7G?
For technical support, including ACST1235-7G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST1235-7G requirements.
6.How does Aetrix verify that ACST1235-7G is sourced from the original manufacturer or authorized distributors?
All ACST1235-7G 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 ACST1235-7G meets industry standards.
7.What is the process for return or replacement of ACST1235-7G?
All ACST1235-7G units undergo pre-shipment inspection (PSI). If there is an issue with ACST1235-7G, 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 ACST1235-7G part is unused and in its original packaging.
Return procedure for ACST1235-7G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ACST1235-7G Tags
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