QK008L5

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The QK008L5 is a member of the Thyristor family, categorised as a TRIAC (Triode for Alternating Current), and is a versatile device used in a variety of applications.

A TRIAC is a 3-pin semiconductor device which serves as a switch in electric circuits, allowing current to flow in either direction through the circuit. It is also able to switch currents of both polarities, thus enabling the user to activate loads via a single control signal. This makes the TRIAC a convenient and cost-effective option in electric circuit designs, as well as allowing shorter switching times. The QK008L5 is the ideal choice for applications with low trigger currents, due to its high sensitivity, and high power dissipation capabilities.

When operating, the QK008L5 TRIAC acts as a valve, allowing the current to flow when a suitable control signal is applied. This occurs when the Gate pin receives a higher voltage than the Anode voltage. The QK008L5 also can also be reverse-biased so that the Anode receives a higher voltage than the Gate. In this state, a small current will still flow through the TRIAC, referred to as the ‘Gate Trigger Current’. When the Gate Trigger Current exceeds a preset threshold, the TRIAC will turn on, and permit current to flow from the Anode to the Cathode and vice versa.

The QK008L5 can be used for a variety of AC load applications in low-power, medium-power and high-power circuits, such as dimmer controls, solid state relay switches, heater control, and home automation systems. In many of these applications, the TRIAC eliminates the need for multiple control circuits and reduces the number of components in the design. This makes it much easier to build and optimise the circuitry, while also reducing costs.

As an AC load switch, the QK008L5 features over-voltage protection, allowing it to handle surges up to 1500V without damage. This not only ensures the device\'s long-term reliability but also reduces the risk of flickering in dimming circuits. The TRIAC also offers excellent thermal stability, making it suitable for high-performance applications that require precise timing, such as motor control in industrial and automotive systems.

In summary, the QK008L5 is a versatile, cost-effective and reliable TRIAC which can be used in a variety of applications including dimmer circuits, solid-state relay switches, heater control and home automation systems. Its unique over-voltage protection and excellent thermal stability make it an ideal choice for high-precision, high-power applications.

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