VS-ST303S04PFN0P

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Thyristors, also known as silicon controlled rectifiers (SCRs), are power electronic components that act as switches to control conduction in various circuits. The VS-ST303S04PFN0P is a cylindrical, TO-220-packaged, three-terminal control thyristor from Vishay Semiconductor comprising of an SCR and a series-connected fast turn-off diode. These components offer an affordable and reliable solution for load switching and over-lighting protection applications such as motor control and phase control.

The VS-ST303S04PFN0P has a rated repetitive peak off-state voltage of 800V and a maximum peak repetitive on-state current of 4A at 25°C ambient temperature. Both the snubber circuits as well as the freewheeling diode are integrated in the device, thus making it suitable for applications where both surge protection of load circuits and high-efficiency operation are required. Its drain-current limit makes it an ideal component for applications requiring a high degree of protection.

The off-state breakdown voltage (VBO) of the VS-ST303S04PFN0P is 16V and its trigger gate current for commutation is typicall 0.4mA. Its non-trigger gate current is typically 0.2mA. The gate turn-off time for the device is also impressive at 0.4 μs. The component also has a reputable surge-handling capability, able to take up to 400A for 8.3 ms at a temperature of 60°C.

The operating principle of thyristors is based on the theory of minority carrier transport. The component is basically composed of four semiconductor regions. When the anode is biased positively with respect to the cathode, the component gets triggered and its emitter-base junction becomes forward-biased, allowing current flow through the component. Upon application of a suitable positive voltage to the gate terminal, the current through the component gets amplified and the component stays in the on-state.

The VS-ST303S04PFN0P is a specially designed component that offers excellent performance. Its reliable protection features as well as wide scalability of the operating current make it suitable for a variety of applications. It is most often used in intelligent switching of loads, motor control, stepper motor control, industrial automation, lighting, power supplies and inverters.

In summary, the VS-ST303S04PFN0P offers a reliable and economic solution for most applications that require an SCR-based device with fast turn-off operation and surge protection. Its excellent electrical characteristics, such as its operating voltages, current ratings and extremely low-trigger gate current, make it an ideal solution for various circuit applications.

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