Q2012LH5

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Thyristors - TRIACs

The Q2012LH5 is a TRIAC, a type of thyristor. A thyristor is a three-terminal semiconductor switching device with dimensions similar to those of a transistor. It has a similar control mechanism to a transistor\'s, however a thyristor does not experience cut-off and therefore functions differently from a transistor. A TRIAC can be thought of as two inversely-connected SCRs (Silicon Controlled Rectifier). A SCR is a voltage-sensitive, current-regulating device with three terminals used as an electrical switch.

Working Principle of the Q2012LH5

The Q2012LH5 is a bidirectional, three-terminal semiconductor switching device. It is triggered in both directions of a power supply current, and can be used in AC or DC applications. It has a three-terminal structure, with an anode (A), cathode (K) and gate (G) terminal. The anode is connected to either the positive or negative supply, the gate is driven by a controlling signal, and the cathode is connected to the other supply pole.

When an external voltage is applied to the a gate, a small current will flow from the gate to the anode, thereby turning on the device. This will cause the device to conduct current in both directions and can be used to switch a load, such as a motor or compressor. Once the gate voltage is removed, the device will turn off and the load will no longer be powered.

Applications of the Q2012LH5

The Q2012LH5 is a popular TRIAC and is used in a variety of applications. It has a wide range of operating voltage (25V to 250V) and is able to control currents up to 5A. It is typically used in applications such as lighting systems, motor speed control and fan control, as it can be used to precisely control the amount of power supplied to the load.

The Q2012LH5 is also used for switching larger loads such as appliances or AC motors. It is usually preferred for controlling AC voltages due to its bidirectional nature and ability to switch large currents. This makes it well-suited for applications such as dimmer systems, heating systems, temperature control and motor speed control.

The Q2012LH5 is also used for safety applications such as overcurrent protection in power supplies or surge protection. Its fast response time and high current-handling capabilities make it well-suited for these applications.

Conclusion

The Q2012LH5 is a popular TRIAC and is used in a variety of applications. It has a wide range of operating voltage and can be used to switch both AC and DC current. It is typically used for lighting, motor speed control and fan control, as well as for over current protection in power supplies and surge protection. The high current-handling capabilities and fast response time of the device make it well-suited for these applications.

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