BT138-600-0TQ

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Thyristors - TRIACs

A TRIAC is a thyristor that is commonly used in AC systems and is mainly used for electrical power control. The acronym TRIAC stands for Triode for Alternating Current, and it is a combination of three solid-state diodes. It is a very versatile device with multiple applications ranging from dimming lights to switching of AC motors.

BT138-600-0TQ Application Field and Working Principle

The BT138-600-0TQ is a 600V, 4A TRIAC usually used for dimming lights and switching of small AC motors. It is a three-terminal device like a traditional diode, with the main difference being that the BT138 can work on both positive and negative portions of an AC waveform. It can be used to switch AC power in applications such as dimmers, AC motor speed controls, and general AC switching applications.

The BT138 is a bidirectional device and is formed in two thin layers, a p-type and an n-type layer. This generates three different points of operation, or “gates”. When a current is applied to one of the gates, the TRIAC will switch on and conduct current in both directions. Thus, when a control signal is applied to the gate, the BT138 will be activated and will allow current through the device.

The BT138-600-0TQ can be used in various types of dimming controls, speed controls, and power supplies. It is commonly used in applications with small AC motor speed controls, such as ceiling fans, and AC lamp dimming. Additionally, it can be used in AC power supplies, as it can be used to control the output voltage of an AC supply.

BT138-600-0TQ Features and Limitations

The BT138-600-0TQ is a robust device with a wide range of operational capabilities and features. These include a surge current capability of up to 60A for a few microseconds, and a maximum ratings of 600V and 4A. It also has low off-state leakage current and a low minimum gate current rating, meaning it can be triggered easily and quickly. Additionally, it can switch on both positive and negative portions of an AC waveform.

The main limitation with the BT138-600-0TQ is the power dissipation of the device under certain conditions. As it is a bidirectional device, the power dissipated will depend on the voltage and load current of the circuit. This means that the power dissipated is quite significant when the TRIAC is switched on. Additionally, a high gate current is required to switch on the device, which can cause problems in applications where the TRYAC must be switched on and off frequently.

Conclusion

The BT138-600-0TQ is a versatile TRIAC device which is commonly used in AC systems. It has a wide range of applications, ranging from lamps dimmers to AC motor speed controls. The device is robust and has a surge current capability of up to 60A. It also has low off-state leakage current and a low minimum gate current rating, meaning it can be triggered easily and quickly.

However, the device has its limitations such as a high power dissipation and a high gate current requirement. Nevertheless, the BT138-600-0TQ is a viable choice for a range of switching, dimming and power control applications.

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