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STMicroelectronics ACST4-7SB
- Part No.:
- ACST4-7SB
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ACST4-7SB.pdf
- Description:
- TRIAC 700V 4A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:9,589
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Product details
Overview
ACST4-7SB from STMicroelectronics is a 4 A, 700 V AC power switch in DPAK package, featuring integrated gate driver, avalanche-controlled clamping (VCL = 1100 V), and high noise immunity (dV/dt > 500 V/µs). It directly interfaces with microcontrollers to control inductive/resistive loads such as dishwasher spray pumps and air-conditioner fans in IEC 61000-4-5-compliant appliance systems.
For engineers reviewing the ACST4-7SB datasheet, ACST4-7SB pinout, ACST4-7SB application, or ACST4-7SB equivalent, this page delivers verified electrical specs, thermal performance data, gate drive requirements, transient ruggedness validation per IEC61000-4-5, and real-world switching behavior under high dI/dt and line surge conditions.
Technical Context
The ACST4-7SB implements an ASD™-based Triac structure with monolithically integrated voltage clamping, enabling safe turn-off energy absorption without external snubbers. Its planar junction ensures high off-state reliability and eliminates need for discrete overvoltage protection components.
It operates across -30 °C to +125 °C junction temperature, supports direct logic-level gate drive (IGT < 10 mA), and sustains non-repetitive 2 kV line transients per IEC61000-4-5 test circuit B with R = 150 Ω, L = 10 µH. The device maintains stable triggering and commutation margins up to 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM/VRRM | ±700 V - Withstands repetitive AC line peaks up to 495 V RMS without conduction. |
| IT(RMS) | 4 A at Tc = 110 °C - Sustains continuous load current in compact DPAK thermal envelope. |
| ITSM | 30 A (20 ms, 50 Hz) - Handles motor startup surges and short-circuit transients without failure. |
| IGT | <10 mA - Enables direct interface with 3.3 V/5 V MCU GPIO via simple series resistor. |
| dV/dt (static) | >500 V/µs at Tj = 110 °C - Resists false triggering from EMI or fast line transients. |
| VCL | 1100 V typ. - Clamps inductive turn-off spikes, eliminating need for external MOV or TVS. |
| Rth(j-c) | 2.6 °C/W - Enables efficient heat transfer to PCB copper pad, supporting high-power density layout. |
Pinout & Package
DPAK (TO-252) package with exposed thermal pad; 3-terminal configuration optimized for surface-mount assembly and thermal management on FR4 PCB with ≥0.5 cm² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT | Switch output terminal | Connects to load (e.g., pump/fan); carries full RMS and surge current; referenced to COM. |
| COM | Common reference terminal | Connects to AC neutral or return path; defines voltage reference for OUT and gate trigger logic. |
| G | Gate input terminal | Sinks triggering current (IGT < 10 mA); requires no external pull-down; driven by MCU GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated clamping protection | VCL = 1100 V enables compliance with IEC61000-4-5 without external components. |
| Direct microcontroller interface | IGT < 10 mA allows single-resistor connection to 3.3 V/5 V GPIO, reducing BOM count. |
| High commutation robustness | (dI/dt)c ≥ 2.0 A/ms at Vout = 300 V ensures reliable turn-off of inductive loads like motors. |
| Planar junction technology | Guarantees stable off-state leakage (IDRM ≤ 10 µA at 25 °C) and long-term reliability in humid environments. |
| Thermal efficiency | Rth(j-c) = 2.6 °C/W supports 4 A RMS operation with minimal heatsinking on standard PCB. |
Applications
| Dishwasher Spray Pump Control | Air-Conditioner Fan Drive |
|---|---|
Use Scenario: On/off switching of 230 V AC spray pump motor during rinse cycles in residential dishwashers. IC Role / Device Role / Timing Role: AC static switch replacing mechanical relay; handles 4 A resistive-inductive load with zero-crossing compatible timing. Use Value: Eliminates contact wear, reduces acoustic noise, and withstands 2 kV line surges per IEC61000-4-5 without snubber. |
Use Scenario: Speed-controlled fan actuation in split-system air conditioners using phase-angle dimming. IC Role / Device Role / Timing Role: High-noise-immunity AC switch triggered by MCU PWM; sustains dV/dt > 500 V/µs during rapid line transitions. Use Value: Enables direct logic-level drive and eliminates external gate driver ICs or optocouplers. |
| Induction Cooktop Power Stage | Smart Plug Load Switching |
Use Scenario: Secondary-side AC switching for auxiliary heating elements in multi-zone induction cooktops. IC Role / Device Role / Timing Role: High-surge-rated power switch handling repetitive 30 A transients during element preheat cycles. Use Value: I²t = 6.4 A²s fusing capability prevents thermal runaway during short-duration overloads. |
Use Scenario: Remote-controllable outlet switching in smart home power strips with surge protection. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays; interfaces with ESP32 or similar Wi-Fi SoC. Use Value: Reduces component count by integrating clamping, gate drive, and high dV/dt immunity in one DPAK device. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACST4-7CB | IGT ≤ 25 mA (vs. ≤10 mA); otherwise identical voltage/current ratings and package. | Requires higher gate drive strength; less suitable for low-power MCU GPIO without buffer. | Select when existing design uses 25 mA gate drivers or legacy firmware assumes higher IGT. |
| ACS108-7SN | Lower IT(RMS) = 0.8 A; SO-8 package; no integrated clamping (requires external TVS). | Limited to sub-100 W loads; not rated for IEC61000-4-5 line surge without added protection. | Choose only for space-constrained, low-power applications where clamping is handled externally. |
Compared with ACST4-7CB and ACS108-7SN, the ACST4-7SB uniquely combines 4 A RMS rating, 10 mA gate sensitivity, and monolithic 1100 V clamping in DPAK-enabling compact, robust, and cost-optimized appliance control without design compromises.
Availability
ACST4-7SB is available at Aetrix Electronics and suitable for dishwasher control modules, HVAC fan drivers, induction cooktop auxiliary stages, and smart plug power switching requiring stable component supply and long-term industrial lifecycle support.
Supply support for ACST4-7SB 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, MEMS, 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 control-prioritizing surge ruggedness, gate simplicity, and thermal efficiency in cost-sensitive, high-volume applications.
FAQ
What is the maximum ambient temperature for ACST4-7SB in natural convection with 0.5 cm² copper?
At 0.5 cm² FR4 copper area and natural convection, ACST4-7SB supports up to 4 A RMS at ambient temperatures ≤ 75 °C (per Fig. 2-2). Above this, derating is required; for 85 °C ambient, maximum RMS current drops to ~3.2 A to maintain Tj ≤ 125 °C.
Can ACST4-7SB replace a mechanical relay in a 230 V AC, 3 A fan application?
Yes-ACST4-7SB is qualified for direct relay replacement in 230 V AC, 3 A fan loads. Its 700 V blocking voltage, 30 A surge rating, and integrated clamping eliminate snubber requirements, while its 10 mA gate drive allows direct MCU control without auxiliary drivers.
Does ACST4-7SB require a heatsink for 4 A continuous operation?
No external heatsink is required if mounted on ≥0.5 cm² copper area (FR4, 35 µm thickness). At Tc = 110 °C (measured at tab), it delivers full 4 A RMS. Thermal resistance junction-to-ambient is 70 °C/W under those conditions (Fig. 11).
How does ACST4-7SB handle IEC61000-4-5 surge testing?
ACST4-7SB passes IEC61000-4-5 Level 4 (2 kV line-to-line, 1 kV line-to-ground) per test circuit B (R = 150 Ω, L = 10 µH). It clamps transients up to 1100 V and breaks over safely on resistive loads with dI/dt up to 50 A/µs, validated in Fig. C and Section 5.
ACST4-7SB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- 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
ACST4-7SB FAQ
1.How can I place an order for ACST4-7SB through Aetrix?
Please submit a Request for Quotation (RFQ) for ACST4-7SB 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 ACST4-7SB reliable?
The price and inventory of ACST4-7SB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACST4-7SB is usually 5 days.
3.What payment methods are accepted for ACST4-7SB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACST4-7SB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACST4-7SB?
ACST4-7SB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACST4-7SB 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 ACST4-7SB?
For technical support, including ACST4-7SB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACST4-7SB requirements.
6.How does Aetrix verify that ACST4-7SB is sourced from the original manufacturer or authorized distributors?
All ACST4-7SB 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 ACST4-7SB meets industry standards.
7.What is the process for return or replacement of ACST4-7SB?
All ACST4-7SB units undergo pre-shipment inspection (PSI). If there is an issue with ACST4-7SB, 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 ACST4-7SB part is unused and in its original packaging.
Return procedure for ACST4-7SB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ACST4-7SB Tags
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