BT149D,126 Discrete Semiconductor Products

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Thyristors - SCRs

BT149D, 126 are silicon controller rectifiers (SCRs), a type of thyristor. SCRs are semiconductor switching devices that are triggered by the presence of a current in their gate. This allows current to flow through the device in only one direction, establishing forward biasing. It is a bidirectional device, meaning that the current can both enter and exit it.

Application Field & Working Principle

BT149D, 126 SCRs are used in applications such as AC or DC light dimming and motor speed control, AC power supplies with active current harmonics compressor, irradiation and environmental control systems, lighting fixtures, and other switching and control functions. Furthermore, these SCRs have been used in industrial and automotive applications and are capable of handling high voltages and currents.

By applying a positive current to the gate, a unique current flow is established and the SCR is turned on. The anode voltage must be greater than the gate voltage for the device to turn on. As the anode voltage increases, the SCR continues to turn on until the current reaches a maximum that depends on the type of SCR.

The current flow through the SCR is determined by the saturation current and the on resistance of the device, which are two of the main characteristics of SCRs. This current is limited by the device and is independent of the voltage applied to the anode. The turn-off procedure follows the same principle: the current is reduced, the SCR is partially turned off, and the device eventually turns off completely.

BT149D, 126 SCRs can withstand higher voltages compared to other SCR types due to the use of silicon-controlled rectifier (SCR) technology, allowing for higher current carrying capacity and lower operating temperatures in these components. The turn-on, turn-off times of the device are very fast, allowing for switching speed of up to 15 KHz.

BT149D, 126 SCRs can be used in a wide range of applications, including motor speed control, phase control, light dimming, active current harmonic compression, lamp ballast and transformer design and power electronics applications, in particular those involving high-voltage and high-power switching. Since these devices can handle high currents and voltages, they are ideal for power semiconductor applications involving up to 6,000 volts.These devices have an estimated lifetime of up to 40,000 hours, making them an attractive option for long-term applications.

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