ACS402-5SB4

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Thyristors are well-known four-layer semiconductor pnpn devices. A type of thyristor, the TRIAC, is widely used in power electronics. The ACS402-5SB4 is a high power automotive grade TRIAC with an average on-state current rating of 400A, gate trigger current of 4 mA, gate triggering voltage of 10-20V and off-state voltage rating of 600V. This article will discuss the application field and working principle of the ACS402-5SB4.

Application Field

The ACS402-5SB4 is suitable for use in automotive and industrial applications, such as motor control, lighting control, and welding. In particular, its high current rating makes it a suitable device for applications where high power is required, such as motor control, where motors can draw up to 10 times the rated current during startup. Furthermore, its high on-state current rating also makes it suitable for applications where load power fluctuations are present, such as welding.

Working Principle

The ACS402-5SB4 is a four-layer, pnpn device that utilizes the principle of minority carriers and drift-diffusion current to control current flow in two directions. Its two terminals, MT1 and MT2, act as the main current terminals, while its gate terminal is used to control current flow between the terminals. When the gate terminal is held at a negative voltage, the TRIAC is open, and no current can flow between the terminals. When the gate terminal is changed to a positive voltage, the TRIAC is triggered and current can flow between the terminals.

The TRIAC can be operated in both directions, making it suitable for bi-directional current flow. Furthermore, its low gate triggering voltage and current requirements make it suitable for microcontroller based control systems, as the gate can be driven from the microcontroller’s GPIO pins. The TRIAC is also capable of phase control, meaning that the current flow through it can be modulated to control the power delivered to a motor or light.

The ACS402-5SB4 is a robust, automotive grade TRIAC, suitable for a variety of applications. Its high on-state current rating, low triggering voltage and current requirements, and bi-directional operation make it a suitable device for a wide range of automotive and industrial applications.

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