CQ220-25B

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Thyristors - TRIACs represent a type of semiconductor that are very versatile in many types of different applications. A TRIAC, which is short for TRIode for Alternating Current, is typically a three-terminal device composed of three diodes, a gate, and an anode-cathode. The device is bi-directional, allowing current to flow both ways. Several different types of TRIACs are available, and CQ220-25B is one of the most popular.

The CQ220-25B is a four-quadrant gated thyristor with a very low (<1μA) gate current. This device is capable of carrying a current of up to 25A and can handle a peak pulse current of up to 50A. It has a breakover voltage rating of between 5V – 88V. The CQ220-25B has a guard ring which helps to limit noise, EMI and voltage transients.

The main application area for the CQ220-25B is AC switching and phase control. The TRIAC can be used to switch between two different currents, allowing an AC current to pass through the load or to interrupt the current. It is commonly used in power supplies, inverters, AC motor control, light dimmers and other applications where reliable AC switching is required. The TRIAC can be used with zero-voltage switching (ZVS) for energy efficiency and low EMI levels.

The principle of operation for the CQ220-25B is quite simple. The device is turned on when a positive gate current is applied, allowing current to flow in both directions. The device continues to turn on until the current reaches the predetermined breakover voltage. When the current drops below the breakover voltage, the gate current is removed, and the device turns off. This process can be repeated for each half-cycle of the AC current, allowing the TRIAC to switch between two currents.

CQ220-25B has several advantages over other TRIACs, such as its high breakover voltage and low gate current. This makes it ideal for applications with higher voltages and lower currents, as well as applications requiring reliable low-noise operation. Its overall performance is also quite good, making it a popular choice for many AC switching applications.

In summary, CQ220-25B is a popular four-quadrant gated TRIAC with a low (<1μA) gate current, capable of handling up to 25A of current and a peak pulse current of 50A. It is used for AC switching and phase control, such as in power supplies, inverters, AC motor control, light dimmers and other such applications. Its principle of operation is quite simple and its advantages over other TRIACs make it an ideal choice for many applications.

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