CQ218I-25B

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Thyristors - TRIACs

TRIACs are three terminal semiconductor devices which are able to control the conduction of electric current in both directions. The CQ218I-25B is a bidirectional thyristor which is suitable for a wide range of applications. In this article, we will discuss the application field and working principle of the CQ218I-25B.

Application Field

The CQ218I-25B is a high performance device with a low on-state voltage droop and a high current capability. The device is suitable for circuit breakers and motor control applications owing to its high thermal and electrical stability. The device has a high surge current and is ideal for use in high power applications that require precise power control. The CQ218I-25B also has a fast switching speed which makes it suitable for use as an AC switch for a wide range of AC power applications.

Working Principle

The CQ218I-25B is a bidirectional thyristor. It operates by controlling the direction and magnitude of current flow through its three terminals. When the control gate voltage of the device is positive, current flows between the anode and the gate terminal. This causes the thyristor to enter the conducting mode, allowing electric current to flow between the anode and cathode terminals. When the control gate voltage is reversed, the current flow is also reversed. This causes the thyristor to enter the non-conducting mode, preventing electric current from flowing between the anode and cathode terminals.

The device features a low on-state voltage droop which allows it to maintain a constant current output even when the device is subjected to varying load conditions. The CQ218I-25B also has a fast switching speed, allowing it to respond quickly to changes in the control gate voltage. The device also features a high surge current, which allows it to handle high power applications without any degradation in its performance. The CQ218I-25B is also temperature stable, making it suitable for use in harsh environments.

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