BT169G,126 Discrete Semiconductor Products

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Thyristors are semiconductor devices that control an electric current flow, commonly known as Silicon Controlled Rectifiers (SCRs). The BT169G and BT126 are examples of SCRs. In this article, we\'ll take a look at their application field and working principles.

BT169G

The BT169G is a single-phase SCR with a nominal current rating of up to 1000A. It is often used in high power switching applications, such as motor control, rectification, AC or DC power control systems, and load control. Its features include fast switching, low turnon-time, low forward-voltage drop and the ability to handle large currents.

The BT169G can be applied in its standard configuration, or with a controlled gate which operates using an external signal, or with a snubber circuit to reduce the turnon voltage. The SCR\'s characteristic curve is linear, allowing it to be used in systems with linear loads and constant current sources.

The BT169G\'s working principle is based on four layers of semiconductor material, typically doped P-type, N-type, N-type and P-type. When the gate voltage is applied, it causes the electrons to flow from the cathode to the anode through a single conducting channel. The SCR is now turned on and will remain in the conducting state until the control voltage is removed.

BT126

The BT126 is a thyristor designed to control high power DC circuits. It has a nominal current rating of up to 9000A and is typically used in motor control, rectification, AC or DC power control systems, and load control applications. Its features include high capacitive load ratings, high voltage withstand ratings, and a reverse-blocking capability when using a negative gate voltage.

The BT126\'s working principle is based on four layers of semiconductor material, typically doped N-type, P-type, N-type and P-type. When a positive gate voltage is applied, it causes electrons to flow from the cathode to the anode through a single conducting channel. The gate voltage is removed to switch the device off. The BT126 also contains a reverse safety device, which is triggered when the gate voltage is negative and prevents current in the reverse direction.

The BT126 is available with various control options such as phase-shift control, voltage controlled phase-shift control, and tachometer feedback control.

Conclusion

The BT169G and BT126 SCRs are highly versatile thyristors designed to control large currents in high power switching applications. The BT169G is suited for medium power applications and the BT126 is ideal for high power applications. Both devices feature low turn-off time and low forward voltage drops and are available with various control options.

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