QK025R5

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Thyristors are a class of semiconductor components that are used in a wide variety of applications. Of particular interest are the TRIACs, which represent a type of Thyristor that is sensitive to current flow in both directions. QK025R5 is a type of TRIAC that has a relatively high power rating of 25amps. This makes it suitable for several applications. Here we explain the working principle of the TRIAC as well as the application fields in which this component is typically used.

What is a TRIAC?

A TRIAC is a form of Thyristor that is sensitive to current flow in both directions. Like other Thyristors, the TRIAC comprises three active regions for regulating electric current. Each region is called a “gate”, and can be triggered by an external signal to change the current flow direction. This is achieved by controlling the region’s voltage. Thus, the TRIAC is capable of controlling the switching of electric current in either direction. This makes it suitable for use in AC (alternating current) circuits, where electric current can change its direction.

Working principle of QK025R5 TRIAC

QK025R5 is composed of three electrical components: a TRIAC body, a gate, and a suppressing diode. The TRIAC body is composed of two semiconductor layers, one P-type and one N-type. At the junction of the two layers, three regions – two P-regions and one N-region – can be found. These regions are called “gates” and are the areas where current control is possible. The gate in QK025R5 is connected to a current-carrying metal plate. When the metal plate is given a voltage pulse, it induces a current in the gate. This then triggers the TRIAC, causing the current to flow through the two P-regions. The suppressing diode is also connected to the metal plate, and is used to prevent the gate current from decaying too quickly. This ensures that the current will flow continuously through the two P-regions.

Applications of QK025R5 TRIAC

Due to its high power rating of 25amps, QK025R5 is particularly suitable for power control applications where currents of this magnitude are required. Examples of these include motor speed control, power factor correction, solenoid actuation and lamp dimming. Furthermore, this component is also suitable for applications where low voltage AC circuits must be switched on and off. Thus, it can be used for control in electrical applications, such as lighting and home appliances.

In summary, the QK025R5 TRIAC is a power-controlled Thyristor that is capable of controlling electric current in both directions. It is suitable for a wide range of applications, including motor speed control, power factor correction, and solenoid actuation. Its high power rating of 25amps is particularly advantageous for these kinds of applications.

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