BT139-800,127

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Thyristors - TRIACs

Thyristors are a type of semiconductor device that are primarily used in industrial control applications. They are also referred to as TRIACs. TRIAC stands for Triode for Alternating Current. A TRIAC is a specific type of thyristor with three terminals (often referred to as anodes, cathodes, and gates). They are used for both AC and DC current. TRIACs are popular for controlling electric motors, light dimmers, electric stoves, and other household appliances.

BT139–800,127 Application Field and Working Principle

BT139–800,127 is a popular type of thyristor. It is designed for bidirectional blocking, unidirectional triggering, and can be used to control AC or DC current. The device has a bidirectional blocker and a unidirectional trigger, which allows it to regulate AC or DC voltage, depending on the circuit settings.

The BT139–800,127 is a quadrant thyristor specifically designed for AC switching applications. Its terminals are labeled as anode/gate 1, anode/gate 2, common anode, and cathode. Its structure consists of two separate diodes connected in opposite directions, with the common anode connection between them. The two anode/gate terminals allow for bidirectional current control.

The BT139–800,127 thyristor has the ability to block current in either direction, and can be turned on in either direction. When the device is turned on, the thyristor will conduct current from its anode to its cathode, allowing for current flow in both directions. Current is only blocked by the thyristor when the gate voltage is below a certain threshold. The gate voltage needs to be above the threshold (called the “gate turn on voltage”) in order for the thyristor to turn on. The gate turn off voltage (the reverse of the gate turn on voltage) is the voltage required to turn off the device.

BT139–800,127 thyristors are popular for their superior features such as minimal switching losses, low on-state voltage drop, and high current capability. They are used in a variety of applications such as motor control, lighting systems, electric cookers, heating elements, AC motor starters, and motor reversing controls.

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