CQ218-45D

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Thyristors are a type of solid-state, semiconductor-based switch that can be used in a multitude of applications. One of the most popular, widespread thyristors is the TRIAC, or “Triode for Alternating Current”. The TRIACs are used in numerous types of applications, due to their versatility, most notably circuit control and light dimming. One such type of TRIAC is the CQ218-45D, a TRIAC module commonly used in electrical control systems. This article will discuss the application fields of the CQ218-45D and its working principle.

The CQ218-45D is a small, compact TRIAC module that can be used in a variety of electrical systems, including motor drives, lighting control, motor speed control, AC heating and various other conduction type control applications. It is even used in medical devices and measurement equipment, such to control and measure the intensity of light exposure or to reduce the amount of electricity flowing through a circuit. The CQ218-45D has a RoHS-compliant, UL-recognized, zero-cross-over design with dual SCRs inside and a TO-220F/AH terminal package, as well as an isolated case for better heat dissipation. Its maximum load current is 45A, its minimum load current is 18A, and it has a nominal VDRM of 200V. Its working temperature range is -40°C to 105°C and its mechanical shock is 6,000 Ivuls and vibrauon is 16GV/10-2000Hz, making it suitable for a wide range of operating conditions.

The CQ218-45D’s Working Principle is based on the principle of TRIACs, which is a three-layer semiconductor device; it is made up of a P-type layer, an N-type layer, and a gate connection. The gate connection serves as the trigger to start and stop the flow of current through the P and N layers when the circuit is closed or open. When it is triggered, the P-type and the N-type layers provide a bridge, creating a path for the current flow across the device. The CQ218-45D is also equipped with a transient surge absorption circuit, further eliminating obstacles that cause interruptions in the current during operation.

The working of the CQ218-45D is quite simple. First, the current flows from the source to the gate connection. When the gate connection receives the trigger signal, a breakdown voltage is created between the P-type layer and the N-type layer. This breakdown voltage creates an opening for the current through the device, allowing the current to flow. As the current passes through the device, it flow throughout the circuit. When the trigger signal is removed, the breakdown voltage between the P and N-type layers is eliminated and the current is stopped.

Aside from its electronic features, the CQ218-45D is designed to be safe and easy to use. It is RoHS compliant, UL recognized and is equipped with an isolated case for heat dissipation, as well as a zero-cross-over design. For safety, the CQ218-45D also has an over-voltage and over-current protection circuit. This protection circuit eliminates the need for fusetrons, allowing for easier and more efficient installation.

In summary, the CQ218-45D is a versatile, solid-state, semiconductor-based TRIAC module used in numerous types of applications. It has a RoHS-compliant, UL-recognized, zero-cross-over design with dual SCRs inside a TO-220F/AH terminal package, as well as an isolated case for better heat dissipation. It has a maximum load current of 45A, a minimum load current of 18A, and its working temperature range is -40°C to 105°C. Its Working Principle is based on the principle of TRIACs, which is a three-layer semiconductor device; when the trigger signal is received, a breakdown voltage is created between the P-type and N-type layers, creating an opening for the current flow. When the trigger signal is removed, the breakdown voltage is eliminated, effectively stopping the current flow.

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