CQ218I-40N

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Thyristors - TRIACs are among the most common semiconductor switches used in various applications. The CQ218I-40N is a TRIAC (three terminal alternating current switch) designed to switch AC current. It is exceptionally suitable for use in a wide variety of applications

Applications:

The CQ218I-40N is used in motor control, light dimming, temperature control and other AC applications. It can be used for applications such as light dimmers, speed controllers, lamp drivers, motor drivers, EMI induction motors, industrial controls and appliance controls. The CQ218I-40N is also suitable for AC switching of all types of loads, including Uninterrupted Power Supplies (UPS) and Photovoltaic arrays.

Working Principle:

The CQ218I-40N is a two-quadrant thyristor with a trigger pin, which provides triac behavior with AC gate driving. This enables fast AC switching and smooth operation at zero cross detection. It is built with four layers, namely gate, cathode, anode, and trigger. It features a control gate where a small trigger signal of the switch control voltage turns on the device. A small current flows when the control signal is applied, which heats the device and allows current to pass. This triggers the device and it turns on and allows the current to flow. The current will be on as long as the gate voltage is above the latching level. Once the gate signal is dropped below the latching level, the current will stop.

The CQ218I-40N is a medium voltage, low power thyristor switch ideally suited for motor control, light dimming, temperature control and other AC applications. It is rated for 40A at 230V AC. The device can provide current control of 40A with a control voltage of 1V and voltage control of 230 V with a control current of 1A.

The CQ218I-40N is built using ceramic, plastic and copper alloy components. Its thin copper alloy leads and robust construction make it ideal for surface mount or through-hole applications. Its low power requirements, pulse trigger current and low thermal impedance enable it to be used in a wide variety of applications.

The CQ218I-40N is designed to protect against overvoltage, overload and thermal stress. It features a built-in current limitation and over temperature protection that can protect against inrush current and short circuit conditions. The device also provides ESD protection and short circuit protection.

In conclusion, the CQ218I-40N is a versatile, reliable and robust three-terminal alternating current switch. It is exceptionally suitable for use in a wide variety of applications, including motor control, light dimming, temperature control and other AC applications. It provides protection against overvoltage, overload and thermal stress, making it an ideal choice for high-voltage, low-power applications.

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