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Thyristors - SCRs

A thyristor is a type of solid-state semiconductor device with four layers of alternating N and P-type materials. It acts exclusively as a switch, conducting current in only one direction. The four layers are commonly referred to as Anode, Cathode, Gate, and Body. The Anode and Cathode materials meet at a junction point and the Gate controls the flow of current through the junction. The SCR, or Silicon Controlled Rectifier, is a specific type of thyristor.

The C45H is a type of SCR that has its Anode and Cathode separated from each other. It is a low-power SCR that employs a Silicon-Germanium alloy as the active layer. This SCR is mainly used for switching operations in low-voltage applications, such as DC motors and lighting control.

The C45H’s working principle is based on the formation of a potential barrier between the Anode and Cathode when it is forward biased. This creates an electrically neutral region called a “space charge” that prevents the flow of electron current between them. When a negative voltage is applied to the Gate terminal, the potential barrier is reduced and current can pass through it. This is known as “breakover”.

The C45H is mainly used in applications where low-power switching is required. Examples include automotive applications, industrial processes, medical instrumentation, and machine shop operations. It is also used for alternating current (AC) and direct current (DC) rectification in industrial DC motor control, switching circuits, and lighting control. Additionally, it can be used in transient protection and power line switchgear.

The C45H is an optimal device for low-power, low-voltage switching applications that do not require high-current capacity. It is robust, reliable, and cost-effective. It is also environmentally friendly, as its construction does not require the use of hazardous materials. Furthermore, the C45H offers advantages such as wide-voltage operating range, compact design, and easy installation.

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