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Product Detailed Parameters
- Description：TRIAC 700V 4A DPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tube
- Triac Type：Standard
- Voltage - Off State：700 V
- Current - On State (It (RMS)) (Max)：4:00 AM
- 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)
- Mounting Type：Surface Mount
- Package / Case：TO-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：DPAK
- Grade：-
- Qualification：-
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Overview
The ACST4-7SB is an AC power switch from STMicroelectronics, utilizing ASD technology to integrate a Triac structure with a high-voltage clamping device. It operates with a repetitive peak off-state voltage of 700 V and supports a nominal RMS on-state current of 4 A in the DPAK package. The device features avalanche-controlled protection with a typical clamping voltage of 1100 V, enabling it to withstand line transients per IEC 61000-4-5 standards without external components. It offers a low gate triggering current (IGT) of less than 10 mA for direct microcontroller interfacing.
Feature Summary
- Integrates a high-voltage clamping device to absorb inductive turn-off energy
- Provides high noise immunity compliant with IEC 61000-4-4 fast transient burst standards
- Enables direct interface with microcontrollers via sensitive gate option
- Eliminates the need for external overvoltage protection components
Applications
- Spray pump control in dishwashers
- Fan control in air-conditioning systems
- AC static switching in home appliance control systems
Procurement Notes
Verify the specific ordering suffix against the manufacturer's documentation to confirm the package type and delivery mode. The 'B' suffix indicates the DPAK package configuration. Confirm whether the standard tube or tape-and-reel variant is required for the intended manufacturing process. Ensure the component version matches the design specifications before procurement.
Selection Notes
Select this component for applications requiring robust AC switching with integrated surge protection. The 4 A rating and 700 V blocking voltage suit general-purpose appliance loads. Consider the thermal resistance characteristics when designing the PCB copper area. Verify that the load inductance does not exceed the commutation capabilities defined in the datasheet.
Part Context
The ACST4-7SB belongs to the ACST series of AC switches designed as rugged alternatives to conventional Triacs. This family utilizes ASD technology to embed overvoltage protection directly within the silicon structure. The series spans various current ratings and packages, targeting industrial and home appliance markets where reliability against line transients is critical.
Replacement Considerations
Direct replacements must match the 700 V blocking voltage, 4 A current rating, and DPAK package. Devices from the same ACST family with identical electrical parameters may be compatible. Verify pinout compatibility and thermal performance before substitution.
