CQ220I-10M

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Thyristors - TRIACs

A TRIAC, or triode for alternating current, is a three-terminal device that can be used to control the flow of current in an AC circuit. When current flows through a TRIAC, it acts like two individual thyristors connected in inverse parallel configuration, with the common terminal acting as the control input. This arrangement allows the device to be switched on and off depending on its control voltage. The CQ220I-10M is a TRIAC in a TO-4 package, meaning it has 4 leads – the gate, Main Terminal 1, Main Terminal 2, and Cathode – so it is capable of controlling the flow of current in two-directional AC circuits.

CQ220I-10M Application Field

The CQ220I-10M TRIAC is mainly used as a semiconductor switch in applications such as lighting control, motor speed control, heater control, temperature/humidity control, and other process control applications. This device is ideal for use in low to medium voltage DC and AC applications due to its high current and voltage ratings and low voltage drop. It is capable of switching on and off currents up to 10 A while maintaining high efficiency.

Working Principle of CQ220I-10M

The working principle of a TRIAC is relatively simple. When a gate terminal is reverse biased with a positive voltage, current is allowed to flow through the device, thus turning it on. When the reverse bias voltage is negative, the current through the device is cut off. By controlling the gate voltage, the device can be turned on and off and current can be switched from one main terminal to the other. In addition, when the current reaches a certain level, a zero voltage crossing can be detected and the TRIAC can be triggered into conduction. This is useful for applications such as motor speed control and lighting control.

The CQ220I-10M also has several protection features, including low leakage current and overvoltage protection. The device is designed to withstand 10 A, 25 V reverse sustain voltage, so it is well suited for most AC applications. It also features anti-parallel diodes, which protect it from potential damage when the terminals are connected in reverse order or when the device receives an over-voltage spike.

Conclusion

The CQ220I-10M is an ideal choice for applications that require on-off control of current in an AC circuit. It is capable of switching up to 10 A with high efficiency, and is protected from potential damage due to over-voltage and reverse biases. With a variety of protection features, it is also well suited for applications such as motor speed control and lighting control.

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