Q4004L4

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Thyristors are a type of semiconductor device commonly used for power control and switching. They are especially useful for controlling high voltage, high current and reactive loads. The most common type of thyristor used in power electronic circuitry is the TRIAC, or Triode for Alternating Current. The Q4004L4 is a popular TRIAC device used for AC power control.

The Q4004L4 is a 400V, 10A TRIAC with a low RMS on-state current of 4A. It is suitable for a wide range of multiple AC power control and switching applications, such as motor and light dimming, solenoid and lamp switching, and relay control. It is particularly suitable for those applications that require high-speed switching and low-voltage compensation. It combines excellent temperature stability with very short switching times.

The Q4004L4 operates on the principle of a thyristor in a two-stage process. When a certain forward voltage is applied to the gate, a small current flows and the thyristor is turned on. This current continues to flow until the voltage across the device is reduced to zero. In the second stage, when current is removed from the gate, the device breaks down into the avalanche breakdown voltage, at which point the current flow through the thyristor is interrupted. This interruption in current flow is referred to as the “tripping” of the TRIAC device.

Another advantage of the Q4004L4 is its ability to be “gate triggered”, meaning that it can switch even at very low levels of voltage. This makes it especially useful in those applications that require precise control over current flow and precise switch times. It is also able to protect against overvoltage and overcurrent situations, further enhancing its versatility.

Although the Q4004L4 TRIAC has limited capabilities, it remains an excellent choice for applications requiring precise AC power control. Its ability to withstand high voltages, precise switching, and low-voltage compensation make it an ideal choice for applications in the industrial and domestic markets.

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