C398B

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Thyristors, also known as silicon controlled rectifiers (SCRs), are electronic components that switch electric current in an electronic device. The C398B is a type of thyristor from Philips Semiconductors that is widely used in industrial and automotive applications. This article will discuss the C398B\'s application field and working principle.

The C398B is a three-terminal semiconductor switching device that blocks current in one direction, yet passes current in the other direction when the required voltage is present. It control current by using a small control current or voltage. This ability to control current at high speed makes thyristors ideal for use in devices such as voltage stabilizers, light dimmers, and motor speed controllers.

The C398B has a wide range of applications; one of its most popular uses is in motor speed controls. The thyristor allows the user to vary the speed and torque of the motor without exceeding the rating of the motor and without the need for a mechanically driven speed change mechanism. The C398B is also often used in high-power usage applications, such as for switching fluorescent ballasts or for controlling the current in a lighting circuit. Additionally, the thyristor can be used in electro-mechanical relays and other switching applications, where high power or fast response time is important.

The C398B is designed to be used in circuits where gate trigger signals need to be isolated from the AC power line. The thyristor works by being fully on all the time, until the gate terminal is driven by a small current or a voltage pulse. When the gate is exposed to a current or pulse, the thyristor switches off and blocks current flow until the gate is positively reset and biased. This feedback loop allows for very accurate current regulation and cycle-by-cycle feedback.

The thyristor also has built-in protection against over-current and reverse current, meaning that it is able to safely shut itself off when the current exceeds the rated maximum or when a reverse current is detected.

In summary, the C398B is a type of thyristor from Philips Semiconductors that can be used to accurately control current in a wide variety of applications, such as motor speed control, lighting circuits, electro-mechanical relays, and other switching applications. The thyristor has safety features such as over-current protection and reverse current protection, making it a popular choice for industrial and automotive applications.

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