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Product Detailed Parameters
- Description：TRIAC 700V 4A IPAK
- 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：Through Hole
- Package / Case：TO-251-3 Long Leads, IPak, TO-251AB
- Supplier Device Package：IPAK
- Grade：-
- Qualification：-
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Overview
The ACST4-7SH is an AC power switch from STMicroelectronics, utilizing ASD™ technology to integrate a Triac structure with a high-voltage clamping device. It provides a repetitive peak off-state voltage (VDRM/VRRM) of 700 V and supports a nominal RMS on-state current (IT(RMS)) of 4 A at Tc = 110 °C in the DPAK package. The device features avalanche control with a typical clamping voltage (VCL) of 1100 V and handles non-repetitive surge currents up to 30 A for 20 ms. Designed for logic-level interfacing, it requires a maximum gate triggering current (IGT) of 10 mA.
Feature Summary
- ASD™ Technology: Integrates a Triac with a high-voltage clamping device to absorb inductive turn-off energy and withstand line transients.
- Logic-Level Interface: Direct microcontroller compatibility with low gate triggering current requirements.
- Transient Protection: Enables equipment compliance with IEC 61000-4-5 standards without external overvoltage protection components.
Applications
- AC static switching in home appliance control systems
- Driving spray pumps in dishwashers
- Controlling fans in air-conditioning units
Procurement Notes
Verify the specific suffix 'H' against official manufacturer documentation, as standard datasheets list 'B' (Tube) and 'FP' (TO-220FPAB). Confirm that the ordering code corresponds to the intended DPAK or TO-220FPAB package variant. Ensure the component meets RoHS compliance requirements if applicable to your manufacturing process.
Selection Notes
Select this component for applications requiring snubberless operation with inductive loads up to 4 A. Consider the thermal resistance values (Rth j-a) when designing PCB copper areas under the tab. Verify that the system's peak line transient voltages remain within the 2 kV ruggedness capability defined by IEC 61000-4-5 testing conditions.
Part Context
The ACST4-7SH belongs to the ACST4 Series family of AC power switches built around ASD™ technology. This series is engineered for home appliances and industrial systems, offering high commutation performance and integrated overvoltage protection to simplify circuit design and reduce component count.
Replacement Considerations
Compatible substitutes include ACST4-7SB and ACST4-7SFP. These variants share identical electrical characteristics but differ in packaging (DPAK vs. TO-220FPAB). Verify pinout compatibility and thermal management requirements before substitution.
FAQ
How does the ACST4 handle inductive load turn-off?
It utilizes integrated ASD™ technology to clamp inductive turn-off energy, allowing it to drive inductive loads up to 4 A without additional snubber circuits.
What is the maximum gate triggering current?
The maximum DC gate triggering current (IGT) is 10 mA, enabling direct interface with standard logic-level microcontrollers.
Is external overvoltage protection required?
No, the device embeds a high-voltage clamping device capable of withstanding line transients per IEC 61000-4-5 standards, eliminating the need for external protection components.
