CQ202-4BS-LF02

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Thyristors, also known as silicon controlled rectifiers, are widely used components in today’s power electronics. A TRIAC is a type of thyristor that is designed to switch AC current. CQ202-4BS-LF02 is a four-quadrant, two-quadrant, sensitized, super-sensitive, single-sector thyristor which belongs to the same family.

CQ202-4BS-LF02 is an integrated package that includes the necessary components for the device to operate. It consists of three pins, and is roughly the same size as a transistor. The most common application of this device is for controlling the heating element in an immersion heater, but it can also be used in power converters and other components.

Application Field: The CQ202-4BS-LF02 is typically used in low voltage applications. It is an affordable option for controlling lighting fixtures, heating elements, motors, and other medium- to low-power AC devices. It can also be used in the regulated step-down of AC power to reduce the current drawn from the power source.

Working Principle: The CQ202-4BS-LF02 works by controlling the AC current, meaning it can switch the current on and off. It does this by controlling the voltage difference between the two allowed pins. The device works on a four-quadrant system, where current is controlled in the positive and negative halves of a cycle. The entire switching cycle is completed when the positive and negative halves of the cycle return to their original state.

The functioning of the CQ202-4BS-LF02 relies heavily on the temperature of the device. The gate voltage is adjusted to a setpoint when certain temperatures are crossed, and the gate current increases once the device starts conducting. The device is designed to trip if the current exceeds the specified upper limit and thus protects the circuitry.

CQ202-4BS-LF02 has a ruggedized package, which allows it to operate even in harsh environmental conditions. Additionally, it is UL recognized and RoHS compliant, making it a safe, reliable, and efficient option for controlling current in a variety of applications.

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