Q2008L4

Thyristors - TRIACs

A TRIAC is a solid-state semiconductor device that is used to control the amount of current flowing in an AC circuit. It is a bidirectional triode AC switch, meaning it can be used to both switch on/off current in an AC circuit, as well as to adjust the amount of current flowing. The TRIAC acronym is derived from the words “triode for alternating current”. This article will discuss the Q2008L4 application field and working principle.

Application Field

The Q2008L4 is a medium-power TRIAC that is suitable for a wide range of applications. It is commonly used for motor speed control, heater controls, street lighting applications, and other AC-power switching applications that require a medium-power device. Because the Q2008L4 is easy to use, it is often the device of choice for amateur (hobbyists) electronics projects.

Working Principle

The basic working principle of the Q2008L4 is based on the standard solid-state, bidirectional AC switching principle. Essentially, the Q2008L4 is activated by an external “trigger circuit” which supplies current to the internal gate of the TRIAC. This activates the TRIAC, allowing current to pass through the internal terminals to the AC circuit.

At any point during the AC cycle, the TRIAC can be switched on or off by altering the parameters of the external trigger circuit. This allows for accurate control over the current flowing in the AC circuit, depending on the voltage and current requirements. The TRIAC can also be programmed to turn on/off at any point during the AC cycle, creating a “pulse width modulation” effect which is commonly used in motor speed control applications.

Conclusion

The Q2008L4 is a medium-power TRIAC that has a wide range of applications, from motor speed control to heater controls. Its simple design and easy operation make it a popular choice for amateur electronics projects. Its basic construction and operation are based on the solid-state, bidirectional AC switching principle, and its external trigger circuit allows for accuracy and flexibility in its operation.