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STMicroelectronics ACST1210-7G
- Part No.:
- ACST1210-7G
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST1210-7G.pdf
- Description:
- TRIAC SENS GATE 700V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,866
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Product details
Overview
ACST1210-7G from STMicroelectronics is a 12 A, 700 V overvoltage-protected AC switch (Triac with integrated crowbar clamping), designed for direct MCU-driven static switching of inductive AC loads up to 12 A RMS without external snubber. It features low gate trigger current (IGT < 10 mA), high static dV/dt immunity (>200 V/µs at 125 °C), and clamps transients per IEC 61000-4-5 up to 2 kV peak. Used in washing machine drum motors and refrigerator compressors.
For engineers reviewing the ACST1210-7G datasheet, ACST1210-7G pinout, ACST1210-7G application, or ACST1210-7G equivalent, this device delivers verified overvoltage ruggedness, gate-drive simplicity with microcontrollers, zero-crossing recovery after surge events, and thermal robustness in D2PAK packaging for industrial appliance control.
Technical Context
The ACST1210-7G integrates a planar Triac structure with an on-die high-voltage crowbar clamp that activates during line transients exceeding VCL (≥850 V), forcing safe conduction for <10 ms to dissipate energy through the load. Its gate-triggering threshold is specified at ≤10 mA with VGT ≤1.0 V, enabling direct drive from 3.3 V or 5 V MCUs via a single series resistor.
It operates across -40 °C to +125 °C junction temperature, sustains 126 A non-repetitive surge (60 Hz, 16.7 ms), and maintains ≥200 V/µs static dV/dt immunity even at elevated temperature - critical for noise-immune operation in motor-control environments with fast inductive turn-off spikes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Supports continuous medium-power AC loads like compressor motors and universal drum motors without heatsink derating at Tc = 104 °C. |
| VDRM / VRRM | 700 V - Blocks full AC mains voltage including surges up to 2 kV peak per IEC 61000-4-5 when combined with load-limiting impedance. |
| IGT (max) | 10 mA - Enables direct gate drive from standard GPIO pins (e.g., STM32, ESP32) using only a 330 Ω–1 kΩ series resistor. |
| dV/dt (min) | 200 V/µs @ 125 °C - Prevents false triggering from fast line transients in noisy industrial/appliance environments. |
| VCL (min) | 850 V @ 25 °C - Clamping voltage threshold ensures controlled crowbar activation before destructive breakdown during inductive turn-off or lightning surges. |
| Rth(j-c) | Not specified for D2PAK in datasheet - thermal path relies on PCB copper area (Rth(j-a) = 45 °C/W with 1 cm² Cu), enabling compact board-level thermal design. |
| Package | D2PAK - Surface-mount power package with isolated tab, UL94 V0 epoxy, and 1.5 g weight; compatible with automated reflow assembly. |
Pinout & Package
D2PAK package with isolated metal tab (thermal pad electrically connected to COM terminal); three terminals: G (Gate), OUT (Main output/anode 2), COM (Common/cathode/anode 1). Tab must be soldered to large copper pour for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Control input | Low-current gate trigger (≤10 mA) - connects to MCU GPIO via current-limiting resistor; polarity-insensitive for quadrants I/II/III. |
| OUT | Main AC output (A2) | Carries full load current (up to 12 A RMS); referenced to COM; withstands 700 V blocking and 2 kV transient peaks. |
| COM | Common return (A1/K) | Reference node for both gate and main current; electrically tied to isolated metal tab; requires PCB copper area for thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar | Clamps transients ≥850 V and safely conducts surge energy through load - eliminates need for external MOVs or RC snubbers. |
| MCU-direct gate drive | IGT ≤10 mA and VGT ≤1.0 V allow robust triggering from 3.3 V/5 V microcontrollers without buffer stages or level shifters. |
| No-snubber inductive switching | Withstands commutation stress of 12 A inductive loads (e.g., compressor windings) without external snubber due to high (dI/dt)c ≥5.3 A/ms. |
| IEC 61000-4-4/4-5 compliance ready | Static dV/dt >200 V/µs and VCL ≥850 V ensure immunity against fast transients and surge voltages defined in key EMC standards. |
| Planar Triac technology | Delivers stable off-state leakage (<1.5 mA @ 125 °C) and high reliability vs. conventional mesa structures in high-humidity or high-temperature environments. |
Applications
| Washing Machine Drum Control | Refrigerator Compressor Drive |
|---|---|
|
Use Scenario: Precise speed and direction control of universal motor driving washing machine drum during spin and wash cycles. IC Role / Device Role / Timing Role: AC mains static switch replacing mechanical relays; handles bidirectional current with zero-crossing turn-on and crowbar-protected turn-off. Use Value: Eliminates relay wear-out and contact arcing; enables silent, maintenance-free motor control while surviving inrush and torque-switching transients. |
Use Scenario: On/off control of hermetic compressor in refrigeration systems, subject to high inrush currents and frequent cycling. IC Role / Device Role / Timing Role: High-reliability AC switch managing full-line voltage and current; activated by thermostat or MCU with precise timing alignment to zero-crossing. Use Value: Withstands 120 A surge (50 Hz, 20 ms) and clamps turn-off spikes - avoids failure during compressor restart under pressure. |
| Air Conditioner Fan Motor | Industrial HVAC Blower Control |
|
Use Scenario: Speed-regulated AC fan motor in split-system air conditioners, requiring robust EMI immunity and thermal stability. IC Role / Device Role / Timing Role: Solid-state AC switch interfacing between triac driver IC and motor winding; handles phase-angle or burst-fire control waveforms. Use Value: Maintains ≥200 V/µs dV/dt immunity at 125 °C ambient - prevents false triggering during PWM-modulated fan operation near other power electronics. |
Use Scenario: Centralized blower control in commercial HVAC units operating continuously under variable load and ambient temperature. IC Role / Device Role / Timing Role: Primary AC power switch in solid-state relay module; coordinated with temperature sensors and airflow feedback loops. Use Value: D2PAK package with Rth(j-a) = 45 °C/W (1 cm² Cu) enables stable 12 A operation without forced cooling - reduces system BOM and footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST1235-7G | Higher IGT (≤35 mA) but ≥2000 V/µs dV/dt immunity - optimized for ultra-noisy environments where gate drive margin is less constrained. | Better suited for industrial settings with heavy EMI (e.g., factory floor PLC outputs), not ideal for low-power MCU GPIO drive. | Select when system noise exceeds 200 V/µs and gate current availability >35 mA; avoid if driving from 3.3 V microcontrollers. |
| BTB12-700CW | Standard 12 A Triac (no integrated crowbar); requires external MOV + RC snubber to meet IEC 61000-4-5; higher VGT (~1.3 V) and IGT (~35 mA). | Increases BOM count and PCB area; lacks automatic post-surge recovery - needs external reset logic or timing delay. | Choose only if cost sensitivity outweighs reliability requirements and design team has snubber design expertise. |
Compared with ACST1235-7G, ACST1210-7G offers lower gate drive burden for MCU integration, while BTB12-700CW demands external protection components and careful layout to achieve comparable surge resilience - making ACST1210-7G optimal for space-constrained, high-reliability appliance designs.
Availability
ACST1210-7G is available at Aetrix Electronics and suitable for washing machine drum control, refrigerator compressor drive, air conditioner fan motor, and industrial HVAC blower control requiring stable component supply, long-lifecycle support, and consistent D2PAK packaging.
Supply support for ACST1210-7G 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, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The ACST™ family targets high-reliability AC mains switching in white goods and industrial controls, combining Triac functionality with self-protecting crowbar technology to replace electromechanical relays and simplify EMC-compliant designs.
FAQ
Is ACST1210-7G compatible with 3.3 V microcontrollers?
Yes - its maximum gate trigger current is 10 mA and gate trigger voltage is ≤1.0 V, allowing direct drive from 3.3 V GPIO pins using a 330 Ω series resistor. No level shifter or buffer is required, and it remains functional across -40 °C to +125 °C junction temperature.
Does ACST1210-7G require a heatsink in 12 A operation?
No dedicated heatsink is needed - the D2PAK package achieves Rth(j-a) = 45 °C/W with only 1 cm² of 35 µm copper on FR4 PCB. At 12 A RMS and Tc = 104 °C, junction temperature stays within 125 °C limit without additional thermal hardware.
How does the crowbar protection recover after a surge event?
After clamping a transient above VCL, ACST1210-7G latches into conduction for <10 ms, then automatically recovers blocking capability at the next AC zero-crossing. No external reset or timing circuit is required - recovery is intrinsic and repeatable for ≥10 polarity-switched surges.
Can ACST1210-7G replace a mechanical relay in washing machine control?
Yes - it replaces SPST AC relays rated ≤12 A resistive/inductive, offering silent operation, infinite cycle life, and immunity to contact welding. Its integrated crowbar eliminates external MOVs, and low IGT simplifies interface with existing MCU firmware - no software changes needed beyond GPIO configuration.
ACST1210-7G 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:
- 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
ACST1210-7G FAQ
1.How can I place an order for ACST1210-7G through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST1210-7G 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 ACST1210-7G reliable?
The price and inventory of ACST1210-7G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST1210-7G is usually 5 days.
3.What payment methods are accepted for ACST1210-7G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST1210-7G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST1210-7G?
ACST1210-7G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST1210-7G 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 ACST1210-7G?
For technical support, including ACST1210-7G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST1210-7G requirements.
6.How does Aetrix verify that ACST1210-7G is sourced from the original manufacturer or authorized distributors?
All ACST1210-7G 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 ACST1210-7G meets industry standards.
7.What is the process for return or replacement of ACST1210-7G?
All ACST1210-7G units undergo pre-shipment inspection (PSI). If there is an issue with ACST1210-7G, 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 ACST1210-7G part is unused and in its original packaging.
Return procedure for ACST1210-7G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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