Q6008LH458

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Thyristors - TRIACs are a class of power semiconductor devices commonly used in a wide range of high power applications, controlling current flow in alternating current (AC) circuits. The Q6008LH458 is one such TRIAC ideal for applications requiring precise triggering and dead-time control. This article introduces the Q6008LH458, explores its application field and its working principle.

Q6008LH458 Overview

The Q6008LH458 is a 4A TRIAC designed to control larger than average currents while still providing precise control in the triggering process. This TRIAC has negative gate trigger voltage and positive gate current characteristics, allowing it to be driven by low gate current source, either by manual switches and relay coils or semiconductor switching devices. The Q6008LH458 is also equipped with a breakdown voltage of 650V, while typical latching current is set at 7A.

Application Fields of Q6008LH458

The Q6008LH458 is suitable for AC switching applications, such as the control of fluorescent lamps and incandescent lamps in the home appliance, or controlling motor speed or direction in office automation and automation equipment. The Q6008LH458 can also be used in applications requiring half and full wave rectification, such as in motor speed and direction control systems, as well as in lighting control systems, pump control and CCTV systems.

Working Principle of Q6008LH458

The Q6008LH458 is a bidirectional semiconductor device with four layers of semiconductor doping, allowing current to flow in both directions in an AC circuit, according to the input voltage. The TRIAC has three pins: Gate (G), Main Terminal 1 (MT1) and Main Terminal 2 (MT2). The Gate pin is used for the triggering process. When CTRL (negative) and MT1 (positive) inputs are applied, a trigger current flowing from G to MT2 turns the TRIAC on, allowing the current to flow from MT1 to MT2. When CTRL is high (positive) and MT2 is low (negative), a trigger current flows from G to MT1, and the TRIAC again turns on, allowing the current to flow from MT2 to MT1, completing the switching of current in the AC circuit.

When switching a TRIAC, the gate current must be critically controlled. In the case of the Q6008LH458, the gate current is designed to be low, allowing it to be triggered by a wide range of sources, including switches, relays and semiconductor switches. This is particularly useful when switching high currents, as it reduces the amount of power required to trigger the switch.

Conclusion

The Q6008LH458 is an ideal choice for controlling larger than average currents, as it is compact and requires low gate current to trigger the switch. It is suitable for a range of AC switching applications, including lighting control, motor speed and direction control, pump control and CCTV systems. Its working principle is based on the triggering of a low gate current which turns the TRIAC on, allowing the current to flow in the AC circuit according to input voltage.

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