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STMicroelectronics ACST4-7CB-TR
- Part No.:
- ACST4-7CB-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ACST4-7CB-TR.pdf
- Description:
- TRIAC 700V 4A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,899
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Product details
Overview
ACST4-7CB-TR from STMicroelectronics is a 4 A, 700 V DPAK-packaged AC power switch with integrated gate driver and avalanche clamping (VCL = 1100 V), designed for direct microcontroller interface in appliance motor control. It delivers 30 A surge current (20 ms), supports IEC 61000-4-5 transient immunity up to 2 kV, and operates reliably from –30 °C to +125 °C junction temperature.
For engineers reviewing the ACST4-7CB-TR datasheet, ACST4-7CB-TR pinout, ACST4-7CB-TR application, or ACST4-7CB-TR equivalent, this device is selected for robust AC line switching of inductive loads-especially where high dV/dt immunity (>500 V/µs), low gate drive current (IGT ≤ 25 mA), and elimination of external snubbers are required.
Technical Context
The ACST4-7CB-TR implements an ASD™-based Triac structure with monolithic voltage clamping, enabling safe turn-off energy absorption without external protection components. Its planar die technology ensures stable off-state blocking (VDRM/VRRM = ±700 V) and high static dV/dt (>500 V/µs at Tj = 110 °C).
It features dual-quadrant triggering (QI–QIII), latching current (IL ≤ 60 mA), holding current (IH ≤ 35 mA), and on-state dynamic resistance (Rd ≤ 100 mΩ at Tj = 125 °C), supporting reliable zero-crossing and phase-angle control in 50/60 Hz mains environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM/VRRM | ±700 V - Sustains full AC line transients including IEC 61000-4-5 surges without breakdown |
| IT(RMS) | 4 A at Tc = 110 °C - Continuous load current rating for DPAK package in thermal-limited designs |
| ITSM | 30 A (20 ms, 50 Hz) - Handles motor startup surges and short-circuit events without failure |
| IGT | ≤25 mA - Compatible with standard MCU GPIOs via simple series resistor (no buffer needed) |
| dV/dt (static) | >500 V/µs - Prevents false triggering from EMI or fast line transients in noisy environments |
| VCL | 1100 V typ. - Clamps inductive turn-off spikes, eliminating need for external MOV or RC snubber |
| Rth(j-c) | 2.6 °C/W - Enables compact heatsinking for 4 A conduction in space-constrained PCB layouts |
Pinout & Package
DPAK (TO-252) surface-mount package with exposed thermal pad; pin 1 = OUT, pin 2 = COM, pin 3 = G (standard 3-pin configuration per STMicroelectronics mechanical drawing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Switch output terminal | Connects to load (e.g., fan, pump); carries full RMS and surge current; referenced to COM |
| COM | Common reference / neutral connection | Return path for load current; ties to AC line neutral or low-side return; defines voltage reference for gate |
| G | Gate input | Sinks trigger current (IGT ≤ 25 mA); logic-level compatible; no external pull-down required |
Key Features
| Feature | Design Value |
|---|---|
| Integrated avalanche clamping | VCL = 1100 V enables self-protected turn-off of inductive loads without external snubber components |
| Direct microcontroller interface | IGT ≤ 25 mA allows direct drive from 3.3 V/5 V GPIOs using only a current-limiting resistor |
| IEC 61000-4-5 compliance | Withstands 2 kV line-to-line surges (per Fig. B test circuit) without derating or external protection |
| High noise immunity | Static dV/dt >500 V/µs prevents spurious turn-on in EMI-heavy appliance environments |
| Planar technology reliability | Guarantees stable off-state leakage (<500 µA at 125 °C) and long-term blocking integrity |
Applications
| Dishwasher Spray Pump Control | Air Conditioner Fan Drive |
|---|---|
|
Use Scenario: On/off cycling of 120–240 VAC spray pump motors during wash/rinse cycles. IC Role / Device Role / Timing Role: AC line switch replacing electromechanical relay; handles inductive kickback and zero-crossing switching. Use Value: Eliminates relay wear-out, reduces acoustic noise, and withstands repeated 30 A surge currents during pump startup. |
Use Scenario: Speed-controlled AC fan operation in residential HVAC units using phase-cut dimming. IC Role / Device Role / Timing Role: Solid-state AC switch enabling precise phase-angle control with microcontroller-generated gate pulses. Use Value: Supports >50,000 switching cycles with no contact degradation; maintains dV/dt immunity across full temperature range. |
| Induction Cooktop Power Stage | Smart Plug Load Switching |
|
Use Scenario: High-reliability switching of heating coil loads subject to rapid thermal cycling and line transients. IC Role / Device Role / Timing Role: Main AC power switch in half-wave or full-wave control topology; clamps turn-off energy from coil inductance. Use Value: VCL = 1100 V absorbs energy that would otherwise stress MOSFETs or require bulky snubbers. |
Use Scenario: Remote-controllable outlet switching for IoT-enabled appliances with UL/CE safety certification requirements. IC Role / Device Role / Timing Role: Safety-certified AC isolation switch meeting IEC 61000-4-5 Level 3 surge immunity. Use Value: Reduces BOM count by integrating clamping and surge handling-no external MOV or TVS needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST4-7SB-TR | Lower gate trigger current (IGT ≤ 10 mA vs. 25 mA); identical voltage/current ratings and package | Better suited for low-power MCU outputs (e.g., 3.3 V GPIO with limited sink capability) | Select when driving from ultra-low-current controllers; same thermal and surge performance |
| ACS108-7SN | Higher RMS current (8 A), TO-220FPAB package, higher Rth(j-c) (4.6 °C/W), IGT ≤ 10 mA | Used in higher-power fan/pump systems requiring greater thermal margin and physical mounting stability | Choose for >4 A loads or forced-air cooling scenarios; not drop-in due to larger footprint and leaded package |
Compared with ACST4-7CB-TR, the ACST4-7SB-TR offers tighter gate drive compatibility but identical ruggedness, while ACS108-7SN trades smaller size for higher current capacity and different thermal management-making each optimal for distinct power and layout constraints.
Availability
ACST4-7CB-TR is available at Aetrix Electronics and suitable for dishwasher control modules, HVAC fan drivers, smart plug designs, and induction cooktop power stages requiring stable component supply and long-term industrial availability.
Supply support for ACST4-7CB-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, specializing in power management, analog, and microcontroller solutions for industrial, automotive, and consumer markets.
The ACST4 Series belongs to ST's ASD™ AC Switch family, engineered specifically for solid-state replacement of relays in home appliance motor control-emphasizing surge resilience, gate simplicity, and system-level cost reduction.
FAQ
What is the maximum ambient temperature for ACST4-7CB-TR in a DPAK package with natural convection?
At natural convection on FR4 PCB with 0.5 cm² copper under the tab, the ACST4-7CB-TR supports up to 4.0 A RMS at 25 °C ambient and derates to ~1.6 A at 75 °C ambient (per Fig. 2-2). For continuous 4 A operation, case temperature must be held ≤110 °C via heatsinking or forced airflow.
Does ACST4-7CB-TR require a snubber circuit for inductive loads?
No. The integrated avalanche clamping structure (VCL = 1100 V) safely absorbs turn-off energy from inductive loads like fans and pumps. STMicroelectronics confirms snubber-free operation up to 4 A RMS with L ≤ 10 µH, per IEC 61000-4-5 test conditions in the datasheet.
Can ACST4-7CB-TR be used with 3.3 V microcontrollers?
Yes. With IGT ≤ 25 mA max and VGT ≤ 1.1 V, a 3.3 V MCU GPIO can directly drive the gate through a 100 Ω series resistor (delivering ~30 mA peak), satisfying both voltage and current thresholds across temperature and process variation.
How does ACST4-7CB-TR differ from standard Triacs in surge handling?
Unlike conventional Triacs, ACST4-7CB-TR embeds a monolithic clamping diode that limits voltage overshoot to 1100 V during inductive turn-off-enabling it to pass IEC 61000-4-5 2 kV surge tests without external components. Standard Triacs require external MOVs or RC networks to achieve comparable ruggedness.
ACST4-7CB-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Triac Type:
- Standard
- Voltage - Off State:
- 700 V
- Current - On State (It (RMS)) (Max):
- 4 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 30A, 33A
- Current - Gate Trigger (Igt) (Max):
- 25 mA
- Current - Hold (Ih) (Max):
- 35 mA
- Configuration:
- Single
- Operating Temperature:
- -30°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
ACST4-7CB-TR FAQ
1.How can I place an order for ACST4-7CB-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST4-7CB-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 ACST4-7CB-TR reliable?
The price and inventory of ACST4-7CB-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST4-7CB-TR is usually 5 days.
3.What payment methods are accepted for ACST4-7CB-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST4-7CB-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST4-7CB-TR?
ACST4-7CB-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST4-7CB-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 ACST4-7CB-TR?
For technical support, including ACST4-7CB-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST4-7CB-TR requirements.
6.How does Aetrix verify that ACST4-7CB-TR is sourced from the original manufacturer or authorized distributors?
All ACST4-7CB-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 ACST4-7CB-TR meets industry standards.
7.What is the process for return or replacement of ACST4-7CB-TR?
All ACST4-7CB-TR units undergo pre-shipment inspection (PSI). If there is an issue with ACST4-7CB-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 ACST4-7CB-TR part is unused and in its original packaging.
Return procedure for ACST4-7CB-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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