BT169D-L,116 Discrete Semiconductor Products

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Thyristors - SCRs

A BT169D-L, 116 is a type of thyristor, specifically an SCR, which stands for ‘silicon controlled rectifier’. This component belongs to a family of semiconductor devices that can entirely control an electric current by alternating between on (on) and off (off) states. This makes them ideal for use in applications where low-power switching is required, such as in power supplies, for lighting control, and for controlling the speed of electric motors.SCRs work by placing a reverse biased PN junction in parallel with an electrode known as a gate. This arrangement effectively creates a switch that can control the passage of electric current. In the off state, the PN junction is not conducting and no current can pass through the component. In the on state, the gate is activated and the PN junction conducts, allowing current to flow. By controlling the activation of the gate, the device can act as an adjustable switch that allows current to be partially blocked, or completely blocked, depending on the desired result.

Applications

BT169D-L, 116 SCRs are most commonly used in power supplies, lighting control, and in the control of electric motors. They are designed to be able to handle up to about 16 A, making them ideal for regulating the current for applications such as home appliances, large AC motors, and industrial processes.SCRs are also used in applications such as linear variable power supplies and for controlling the switching of high-voltage electrical devices. In addition, they are also used in precision rectification and power factor correction. Their ability to precisely control the passage of electric current makes them ideal for such use.

Working principles

The basic working principle of an SCR is the same regardless of its size or function. At the heart of an SCR is a PN junction, typically composed of an N-type and a P-type semiconductor that are both connected together. The junction is ‘reverse biased’, meaning that it is not normally conducting electric current and is effectively in the ‘off’ state. When the SCR’s gate is activated, the current can flow through the junction, turning the device ‘on’.To maintain the on state, an SCR must have current continuously flowing through it. If the current flow is interrupted, the device will reset back to the off state and will not allow current to flow until the gate is re-activated. This makes SCRs far more reliable than other components that switch electrical current, such as transistors.

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