Q4012LH5

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Thyristors - TRIACs

A TRIAC is a three-terminal electronic semiconductor device consisting of three interconnected semiconductors: a main anode, main cathode and main control terminal. TRIACs have a wide variety of uses and applications, ranging from the control of motors, dimmers and lighting, to control of heating devices in domestic appliances, such as toasters and ovens. The Q4012LH5 Triac is especially used for better efficiency and energy saving.

Q4012LH5 Application Field

The Q4012LH5 is a medium power Triac, especially suitable for power control applications. It features high voltage capabilities, very low junction capacitances, low gate trigger current and very fast turn-off characteristics. This Triac is ideal for AC switching applications and can be used for controlling AC motors, heating or lighting in home or industrial applications.

Q4012LH5 Working Principle

The Q4012LH5 Triac operates by changing its electrical resistance in response to a control voltage applied to the gate terminal. The Triac is triggered when a gate current greater than its holding current flows into its gate terminal. When it is triggered, the gate current controls its own magnitude allowing a smooth operation from the start of turn-on to the end of turn-off. The Triac also requires a minimum gate current greater than its latching current for turn-on and falls out of conduction when the gate voltage falls below the latching current.

When it is in an On state, the Q4012LH5 Triac acts like an electronic switch, conducting between its main terminal, anode, and main terminal, cathode, when a voltage is applied across main terminals and gate voltage is present. When the applied voltage between main terminals is removed, the Triac will remain in an On state until the gate current is less than its holding current, at which point the Triac will cycle off, stopping the flow of current between its main terminals.

The Q4012LH5 Triac is also capable of controlling the power level of a circuit, since the amount of current conducted through the device can be controlled. By controlling the gate voltage, the amount of current conducted by the Triac can be adjusted, allowing a precise control over the power level of the circuit.

Conclusion

In conclusion, the Q4012LH5 is a medium power Triac suitable for power control applications and AC switching. It features high voltage capabilities and quick triggering and turn-off characteristics, so it can be used for controlling AC motors, heating or lighting in domestic or industrial applications. It also provides a precise control over the power level of the circuit by controlling the amount of current conducted by the Triac.

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