BT138B-600,118

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Thyristors - TRIACs

A TRIAC is a type of thyristor that has three pins and is able to control both voltage and current in an alternating current (AC) circuit, regardless of the direction of current flow. It is a semiconductor device, much like a diode or transistor, that is triggered by a current passing through its gate and opening the circuit.

The BT138B-600,118 is a sensitive gate TRIAC, indicating that it can be triggered by a small gate current (typically 600, 118 mA). It is a 600V device with a MOSFET-style gate and has a maximum current rating of 8A. It is widely used in numerous power control applications such as lamps, home appliances, starter motors, and more.

The BT138B-600,118 is based on a bidirectional switching principle, meaning it is able to switch current in both directions. It consists of three pins, called Gate, Anode and Cathode. The Gate pin controls the switching function and is connected to the circuit control electronics. The Anode and Cathode pins are connected to the AC voltage source. When the Gate pin is triggered, it allows current flow through the Anode and Cathode pins, making the TRIAC switch ‘on’.

The BT138B-600,118 can also be triggered in several ways. It can be directly triggered using a voltage pulse, normally at a voltage of between 6 to 8V, or with some control electronics like a microcontroller. The Gate current required to trigger the device is approximately 600, 118 mA, which is much less than typically required by other TRIACs. This makes it an ideal choice for low power control applications.

The triggering of the BT138B-600,118 can also be done using snubber circuits or zero-crossing detectors. These circuits are used to protect the device from voltage spikes and reduce its susceptibility to unwanted switching. Snubber circuits are generally preferred over zero-crossing detectors because of their improved noise immunity.

To sum it up, the BT138B-600,118 is a three-terminal, silicon-controlled, rectifier diode device with a MOSFET-style gate. It is used in a wide array of power control applications such as lamps, home appliances, starter motors, and more. It can be triggered either directly using a voltage pulse, or with some control electronics. Additionally, it can be triggered using snubber circuits or zero-crossing detectors. This makes it an ideal choice for low power control applications.

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