Q4008R4

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Thyristors - TRIACs

Q4008R4 Application Field and Working Principle

A TRIAC is a three terminal, bidirectional, AC solid-state semiconductor switching device that can control large amounts of power by switching both half cycles of an AC waveform.

The Q4008R4 is an example of a state-of-the-art TRIAC. It is a low-power medium-power thyristor designed to switch small and medium AC loads up to 400Vrms at up to 8A average. The device is specifically designed to offer a cost-effective solution for motor control applications, specifically small permanent magnet motor (PMM) control. It has a surge capability of 80A peak, 250V blocking voltage and a maximum gate trigger current of 2.3mA. It is housed in a 4-pin TO-92 package.

The Q4008R4 works on the principle of a thyristor. A thyristor is a solid state device comprising four or more alternating layers of p-type and n-type semiconductor materials. When a voltage exceeding the threshold voltage (or, “holding voltage”) is applied to the thyristor gate, the device turns on and current flows through the circuit. The thyristor remains in its “on” state until current flow has stopped for a certain length of time.

The Q4008R4 has four terminals. The base is the connecting point for the control current and is used to switch the device on. The anode and cathode are the main current carrying terminals and are used to connect to the load. Lastly, the gate is the control terminal and is where the control current is applied to enable current flow between the anode and cathode.

The Q4008R4 is suitable for a range of low-power AC switching applications. It can be used in applications such as lighting and heater control, motor speed control, industrial automation and power-supply switching. It is particularly well-suited to PMM motor control applications where its built-in threshold trigger voltage and low power dissipation make it ideal.

In summary, the Q4008R4 is an example of a low-power medium-power TRIAC. It is designed for applications such as lighting and heater control, motor speed control, industrial automation, and power-supply switching, and is particularly well-suited to PMM motor control applications. Its four terminals enable it to turn on and off according to the control current applied, thereby enabling the switching of large amounts of AC power.

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