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STMicroelectronics ACS120-7SB
- Part No.:
- ACS120-7SB
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ACS120-7SB.pdf
- Description:
- TRIAC SENS GATE 700V 2A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,714
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Product details
Overview
ACS120-7SB from STMicroelectronics is a DPAK-packaged AC line switch designed for solid-state replacement of electromechanical relays in appliance control systems. It features ±700 V blocking voltage (VDRM/VRRM), 2 A RMS on-state current (IT(RMS)), avalanche-controlled clamping at 1100 V (VCL typ), <10 mA gate triggering current (IGT), and integrated gate-level shifter driver enabling direct microcontroller interface without external snubber or varistor.
For engineers reviewing the ACS120-7SB datasheet, ACS120-7SB pinout, ACS120-7SB application, or ACS120-7SB equivalent, this device serves as a high-noise-immunity (dV/dt >500 V/µs), single-chip AC switching solution for inductive load control in IEC 61000-4-5-compliant white goods - with verified thermal performance (Rth(j-l) = 2.6 °C/W), low on-state resistance (Rd ≤ 200 mΩ), and negative-gate-trigger operation.
Technical Context
The ACS120-7SB implements ST's ASD™ (Advanced Static Switching Device) architecture, integrating a high-voltage clamping diode and gate-level shifter to absorb inductive turn-off energy and isolate digital controllers. Its negative-gate-trigger mechanism requires gate current to flow *out* of the G pin, eliminating gate kickback and enabling resistor-only drive from MCU GPIOs.
It operates across full AC line cycles (50–60 Hz), sustains 2 kV non-repetitive line pulses per IEC 61000-4-5, and supports parallel mounting on shared heatsinks. Thermal design is enabled by its DPAK package's 2.6 °C/W junction-to-tab resistance and defined copper surface requirements (S = 0.5 cm²).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | ±700 V - Withstands peak AC line transients up to 460 V RMS plus surges without breakdown. |
| IT(RMS) | 2 A at Tc = 115 °C - Supports continuous switching of solenoids, valves, fans, and defrost heaters in appliances. |
| VCL (typ) | 1100 V - Clamps inductive turn-off energy safely, eliminating need for external snubbers or MOVs. |
| IGT (max) | <10 mA - Enables direct drive from standard MCU GPIOs via simple series resistor (e.g., 140 Ω @ 12 V). |
| dV/dt (min) | 500 V/µs - Ensures noise immunity against fast-rising EMI in motor-driven or relay-switched environments. |
| Rd (max) | 200 mΩ at Tj = 125 °C - Limits conduction loss to ≤520 mW at 2 A RMS, reducing thermal stress on PCB. |
| Rth(j-l) | 2.6 °C/W - Enables efficient heat transfer to copper pad or heatsink, supporting compact board layout. |
Pinout & Package
DPAK (TO-252) package with exposed tab for thermal conduction; 3-terminal configuration (OUT, COM, G); tab electrically connected to COM pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM | Common reference terminal | Connected to AC neutral or return path; tab is internally bonded to COM for low-inductance thermal/electrical path. |
| OUT | Switch output terminal | Connected to load (e.g., solenoid, fan); carries full AC load current and withstands ±700 V off-state voltage. |
| G | Negative gate input | Receives sinking current (IGT <10 mA) from MCU; triggers conduction when current flows *out* of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated avalanche clamping | Clamps turn-off inductive energy up to ~10 mJ at VCL = 1100 V, removing need for external snubber networks. |
| Gate-level shifter | Isolates MCU from high-voltage AC side, preventing gate kickback and enabling safe direct GPIO control. |
| No external protection required | Meets IEC 61000-4-5 surge immunity (2 kV) without varistors or RC snubbers - reduces BOM count by up to 80 %. |
| Parallel-mount capable | Shared cooling pad support allows multiple ACS120-7SB devices on one heatsink without thermal or electrical crosstalk. |
| High dV/dt immunity | Static dV/dt ≥500 V/µs ensures reliable operation in noisy appliance environments with motors and compressors. |
Applications
| Washing Machine Control | Dishwasher Valve Actuation |
|---|---|
|
Use Scenario: Switching water inlet valves and drain pumps during cycle phases. IC Role / Device Role / Timing Role: AC line switch replacing mechanical relay for zero-crossing–independent, silent, wear-free control. Use Value: Eliminates contact arcing and mechanical wear, enabling >100,000 switching cycles with stable on-resistance (Rd ≤ 200 mΩ). |
Use Scenario: Driving detergent dispenser solenoids and circulation pump motors. IC Role / Device Role / Timing Role: High-noise-immunity AC switch handling inductive loads with fast current decay (dI/dt up to 50 A/µs). Use Value: Sustains 20 A non-repetitive surge (ITSM) and clamps turn-off voltage to 1100 V, preventing coil-induced voltage spikes. |
| Refrigerator Defrost Heater | Air Conditioner Fan Control |
|
Use Scenario: Cycling resistive defrost heaters during compressor off periods. IC Role / Device Role / Timing Role: Solid-state AC switch managing 2 A RMS resistive load with IEC 61000-4-5 transient immunity. Use Value: Withstands 2 kV line surges without failure, enabling compliance with appliance safety standards without added protection components. |
Use Scenario: Controlling condenser and blower fans in HVAC indoor units. IC Role / Device Role / Timing Role: Thermally optimized AC switch mounted directly on metal chassis for passive cooling (Rth(j-l) = 2.6 °C/W). Use Value: Supports continuous 2 A operation at 115 °C case temperature, reducing need for forced airflow or oversized heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC line switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ACS108-7SB | Lower IT(RMS) = 1.2 A; same VDRM = 700 V; reduced I²t rating (1.1 A²s vs 2.2 A²s). | Suitable only for sub-1.2 A loads (e.g., small solenoids); not rated for 2 A fans or pumps. | Select when load current is ≤1.2 A and space/thermal constraints favor identical DPAK footprint. |
| ACS120-7ST | Same electrical specs but TO-220AB package; higher Rth(j-l) = 2.6 °C/W but larger heatsink interface area. | Better suited for through-hole assembly and higher-power derating where board space permits. | Choose for legacy through-hole designs or when mechanical robustness and thermal mass outweigh SMT density needs. |
Compared with ACS108-7SB, ACS120-7SB delivers 67% higher RMS current capacity and double the fusing I²t, making it suitable for demanding 2 A appliance loads; versus ACS120-7ST, it offers identical performance in a smaller DPAK footprint with equal thermal resistance but optimized for automated SMT placement.
Availability
ACS120-7SB is available at Aetrix Electronics and suitable for washing machine control, dishwasher valve actuation, and refrigerator defrost heater management requiring stable component supply, long lifecycle support, and IEC 61000-4-5 compliance.
Supply support for ACS120-7SB 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 technologies for industrial, automotive, and consumer markets.
The ACS™ AC line switch product line was developed specifically for solid-state replacement of electromechanical relays in white goods, delivering high reliability, surge immunity, and simplified system design for 50–60 Hz AC load control.
FAQ
What is the correct gate drive polarity for ACS120-7SB?
The ACS120-7SB requires negative gate triggering: gate current must flow *out* of the G pin into the driving circuit (e.g., MCU GPIO configured as open-drain or active-low). A 140 Ω resistor between a 12 V MCU output and G achieves IGT < 10 mA while limiting PG(AV) to 0.1 W. Positive gate voltage is not functional and may damage the gate structure.
Can ACS120-7SB replace a mechanical relay in a 2 A, 230 VAC fan circuit?
Yes - it is qualified for 2 A RMS at 230 VAC with 50–60 Hz sine wave conduction and Tc = 115 °C. Its 200 mΩ on-state resistance yields ≤520 mW conduction loss, and its 1100 V clamping voltage handles inductive kickback without snubbers. Real-world validation includes fan control in ST's reference designs for air conditioners and dryers.
Does ACS120-7SB require a heatsink in typical appliance applications?
Not necessarily: with Rth(j-l) = 2.6 °C/W and 0.5 cm² copper pad, junction temperature stays below 125 °C at 2 A RMS and 40 °C ambient. For continuous 2 A operation in enclosed, high-ambient environments (>60 °C), a minimal 10 cm² copper pour or clip-on heatsink is recommended per ST AN2922 thermal guidelines.
How does ACS120-7SB meet IEC 61000-4-5 surge immunity?
It passes the 2 kV line-to-line surge test (1.2/50 µs voltage wave + 8/20 µs current wave) per Figure 3 of IEC 61000-4-5 by combining avalanche clamping (VCL = 1100 V) and controlled breakover under high-energy shocks. The internal clamping diode absorbs energy up to ~10 mJ, and the device sustains 10 such surges per polarity without degradation.
ACS120-7SB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- ASD™
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tube
- Product Status:
- Active
- Triac Type:
- Logic - Sensitive Gate
- Voltage - Off State:
- 700 V
- Current - On State (It (RMS)) (Max):
- 2 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 20A, 11A
- Current - Gate Trigger (Igt) (Max):
- 10 mA
- Current - Hold (Ih) (Max):
- 45 mA
- Configuration:
- Single
- Operating Temperature:
- -30°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
ACS120-7SB FAQ
1.How can I place an order for ACS120-7SB through Aetrix?
Please submit a Request for Quotation (RFQ) for ACS120-7SB 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 ACS120-7SB reliable?
The price and inventory of ACS120-7SB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ACS120-7SB is usually 5 days.
3.What payment methods are accepted for ACS120-7SB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ACS120-7SB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ACS120-7SB?
ACS120-7SB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ACS120-7SB 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 ACS120-7SB?
For technical support, including ACS120-7SB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ACS120-7SB requirements.
6.How does Aetrix verify that ACS120-7SB is sourced from the original manufacturer or authorized distributors?
All ACS120-7SB 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 ACS120-7SB meets industry standards.
7.What is the process for return or replacement of ACS120-7SB?
All ACS120-7SB units undergo pre-shipment inspection (PSI). If there is an issue with ACS120-7SB, 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 ACS120-7SB part is unused and in its original packaging.
Return procedure for ACS120-7SB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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