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STMicroelectronics ACST1210-7GTR
- Part No.:
- ACST1210-7GTR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
ACST1210-7GTR.pdf
- Description:
- TRIAC SENS GATE 700V 12A D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
ACST1210-7GTR 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 snubbers. 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.
For engineers reviewing the ACST1210-7GTR datasheet, ACST1210-7GTR pinout, ACST1210-7GTR application, or ACST1210-7GTR equivalent, key selection criteria include gate drive compatibility with 3.3 V/5 V MCUs, snubberless operation with universal motors and compressors, transient ruggedness under IEC 61000-4-4/4-5, and thermal performance in TO-220AB or D2PAK packages at Tc = 104 °C.
Technical Context
The ACST1210-7GTR integrates a planar Triac structure with an on-die overvoltage crowbar circuit that triggers into conduction during line transients exceeding VCL ≥ 850 V, safely diverting surge energy through the load. Its gate threshold (VGT ≤ 1.0 V) and low IGT enable direct drive from microcontroller GPIO pins via a single series resistor.
It operates in quadrants I, II, and III with symmetrical blocking capability (VDRM/VRRM = 700 V), supports repetitive 12 A RMS current at Tc = 104 °C, and maintains stable latching (IL ≤ 50 mA) and holding (IH ≤ 30 mA) currents across –40 to +125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 12 A - Sustains continuous AC load current up to 12 A RMS at case temperature ≤ 104 °C without heatsink derating |
| VDRM / VRRM | 700 V - Blocks 700 V peak AC line voltage in both directions, suitable for 230 VAC mains with safety margin |
| IGT | <10 mA - Enables direct gate drive from standard MCU I/O pins (e.g., STM32, ESP32) using only a 1–2.2 kΩ series resistor |
| dV/dt (static) | >200 V/µs @ 125 °C - Resists false triggering from fast AC line noise per IEC 61000-4-4, eliminating need for RC snubbers |
| VCL | ≥850 V @ 25 °C - Clamps inductive turn-off spikes and absorbs IEC 61000-4-5 surges up to 2 kV without external TVS or MOV |
| Rth(j-c) | 1.5 °C/W (D2PAK) - Enables efficient heat transfer to PCB copper pour or heatsink, supporting 8–10 W dissipation at ΔT = 15 °C |
| VTM | ≤1.5 V @ 17 A - Low on-state voltage drop minimizes conduction losses and self-heating during motor startup surges |
Pinout & Package
D2PAK (TO-263) surface-mount package with isolated tab; thermally optimized for PCB copper area (1 cm² Cu reduces Rth(j-a) to 45 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| G | Gate | Low-current control input (IGT < 10 mA); referenced to COM; requires no negative bias for quadrant III triggering |
| OUT | Main output terminal (anode side) | Carries full load current; electrically isolated from tab; connects to AC load (e.g., compressor winding) |
| COM | Common terminal (cathode side) | Reference node for gate and load return path; ties to AC mains neutral or phase depending on topology |
Key Features
| Feature | Design Value |
|---|---|
| Integrated overvoltage crowbar protection | Self-triggers at VCL ≥ 850 V to clamp IEC 61000-4-5 surges up to 2 kV, eliminating external MOVs or TVS diodes |
| Snubberless inductive switching | Withstands commutation stress from universal motors and compressors without RC snubber networks due to high (dI/dt)c ≥ 14 A/ms |
| MCU-compatible gate drive | Accepts logic-level gate signals (VGT ≤ 1.0 V, IGT < 10 mA) directly from 3.3 V or 5 V microcontrollers |
| High thermal robustness | Junction-to-case resistance of 1.5 °C/W (D2PAK) enables >10 W power handling with minimal PCB copper area |
| IEC 61000-4-4/4-5 compliance ready | Validated against fast transient bursts (4 kV contact, 8 kV air) and surge immunity (2 kV line-earth) without design modifications |
Applications
| Washing Machine Drum Motor Control | Refrigerator Compressor Drive |
|---|---|
Use Scenario: Controlling bidirectional speed and direction of universal motor in washing machine drum via phase-angle or zero-cross switching. IC Role / Device Role / Timing Role: AC mains switch replacing mechanical relays; handles 12 A inrush and 8 A steady-state current with zero-cross turn-on to reduce EMI. Use Value: Eliminates relay wear-out and contact arcing; enables precise motor timing control and silent operation without snubber components. | Use Scenario: Direct switching of hermetic compressor in refrigerator or air conditioner, managing startup torque and run-cycle duty. IC Role / Device Role / Timing Role: Solid-state AC switch interfacing with thermostat or MCU; sustains 12 A RMS continuously at Tc = 104 °C with no forced cooling. Use Value: Replaces electromechanical contactors; withstands compressor inrush (≥6× rated current) and inductive turn-off spikes without failure. |
| Industrial HVAC Fan Control | Smart Plug Load Switching |
Use Scenario: Modulating 3-phase fan speed in commercial HVAC systems using single-phase ACST1210-7GTR per phase in back-to-back configuration. IC Role / Device Role / Timing Role: High-noise-immunity AC switch operating in electrically noisy plant environments; triggered by isolated gate driver or optocoupler. Use Value: Maintains reliable operation under 2 kV surge events and 200 V/µs dV/dt transients common near VFDs and contactors. | Use Scenario: Embedded AC switching in Wi-Fi/BLE-enabled smart plugs controlling resistive or inductive household loads (e.g., lamps, heaters, small tools). IC Role / Device Role / Timing Role: Primary isolation and switching element between mains input and load; gate driven by ESP32 or similar SoC via current-limited GPIO. Use Value: Reduces BOM count by removing external overvoltage protection and snubbers while meeting UL 60730 and IEC 62368-1 creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST1235-7GTR | Higher gate trigger current (IGT < 35 mA) but superior static dV/dt immunity (≥2000 V/µs @ 125 °C) | Better suited for ultra-noisy industrial environments where gate noise coupling is unavoidable | Select when gate drive source has limited current capability but system noise exceeds 1 kV/µs |
| BTB12-700CW | Standard Triac (no integrated crowbar); requires external MOV + RC snubber for IEC 61000-4-5 compliance | Lower cost but increases board area, component count, and validation effort for surge immunity | Select only if legacy design reuse is required and external protection can be accommodated |
Compared with ACST1235-7GTR, the ACST1210-7GTR offers lower gate drive burden ideal for battery-powered or low-power MCUs, while BTB12-700CW lacks on-chip overvoltage protection-requiring additional discrete components to meet same transient standards.
Availability
ACST1210-7GTR is available at Aetrix Electronics and suitable for washing machine motor control, refrigerator compressor drive, and smart plug load switching requiring stable component supply, long-term lifecycle support, and RoHS-compliant D2PAK packaging.
Supply support for ACST1210-7GTR 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™ family is ST's application-specific discrete (A.S.D.®) power switch product line, engineered for snubberless, overvoltage-protected AC control in home appliances and industrial equipment.
FAQ
Is ACST1210-7GTR compatible with 3.3 V microcontrollers?
Yes. With VGT ≤ 1.0 V and IGT < 10 mA, the ACST1210-7GTR can be directly driven by 3.3 V GPIO pins using a 1.5 kΩ series gate resistor. Gate power dissipation remains below 0.1 W average, well within safe limits for most MCUs.
Does ACST1210-7GTR require a heatsink in D2PAK package?
Not necessarily. At 12 A RMS with Tc ≤ 104 °C, the D2PAK's Rth(j-c) = 1.5 °C/W allows ~10 W dissipation with only 15 °C rise. A 1 cm² copper pour reduces Rth(j-a) to 45 °C/W, enabling natural convection operation in most appliance enclosures.
Can ACST1210-7GTR replace a mechanical relay in AC mains switching?
Yes - it is specifically designed for this purpose. Its 12 A RMS rating, 700 V blocking voltage, and built-in overvoltage protection eliminate relay wear, contact bounce, and arcing. It supports zero-cross switching for EMI reduction and silent operation in consumer appliances.
What is the maximum surge voltage ACST1210-7GTR can withstand without external protection?
Per IEC 61000-4-5 testing, ACST1210-7GTR withstands 2 kV line-to-ground surges superimposed on peak mains voltage (e.g., 325 V for 230 VAC), thanks to its integrated crowbar clamping (VCL ≥ 850 V). No MOV, TVS, or varistor is needed for compliance.
ACST1210-7GTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ACS™/A.S.D®
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Packaging:
- Tape & Reel (TR)
- 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
ACST1210-7GTR FAQ
1.How can I place an order for ACST1210-7GTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST1210-7GTR 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 ACST1210-7GTR reliable?
The price and inventory of ACST1210-7GTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST1210-7GTR is usually 5 days.
3.What payment methods are accepted for ACST1210-7GTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST1210-7GTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST1210-7GTR?
ACST1210-7GTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST1210-7GTR 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 ACST1210-7GTR?
For technical support, including ACST1210-7GTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST1210-7GTR requirements.
6.How does Aetrix verify that ACST1210-7GTR is sourced from the original manufacturer or authorized distributors?
All ACST1210-7GTR 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 ACST1210-7GTR meets industry standards.
7.What is the process for return or replacement of ACST1210-7GTR?
All ACST1210-7GTR units undergo pre-shipment inspection (PSI). If there is an issue with ACST1210-7GTR, 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 ACST1210-7GTR part is unused and in its original packaging.
Return procedure for ACST1210-7GTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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