2N1805

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Thyristors are semiconductor devices that use a three-terminal switching arrangement to control the flow of current. As the name implies, thyristors are made up of two different pressed pieces, the gate and the anode. The gate is usually a small grid, which is then connected to the gate electrode and anode. When a pulse of current is applied to the gate, the current instantly increases, thereby controlling current flow through the device. The most common thyristor found in industry is the SCR, or the Silicon Controlled Rectifier.

The 2N1805 is a popular SCR that is used in a variety of applications due to its small size, low cost, and versatile operating characteristics. The device measures just 4mm in diameter, with a 180A on-state current and an off-state voltage breakdown rating of 400V. The 2N1805 is commonly used for AC power control, motor control, and lighting control, among other industrial applications.

When using the 2N1805 SCR, a source of gate current is typically required to trigger the SCR into conduction. When the gate receives enough current, the SCR is then activated and passes current through to the anode. This then forms a closed circuit between the anode and the cathode, allowing current to pass and continue to flow, until the current is shut off by reducing the gate current. This mechanism can be employed to control a wide range of applications, including lights, motors, and other AC power devices.

The 2N1805 SCR is a robust and reliable device, and relatively straightforward to apply. The SCR does require precise timing, as the gate current must be carefully managed to ensure the SCR is triggered at the correct time, and also turned off when required. The SCR must also be protected from over current, as excessive current can damage or destroy the SCR. Fortunately, the 2N1805 SCR is well suited to a variety of applications due to its small size and low cost.

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