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Thyristors - TRIACs

BCR8CM-12LB#BB0 application field and working principle

A TRIAC is a three-terminal, off-state, semiconductor current-controlled device designed to control current in both directions. It is an acronym for "triode for alternating current." A BCR8CM-12LB#BB0 TRIAC is an AC switch and phase control switch that is used in some reflexive loads, rectifiers, and heaters. The terminal pins are designated as MT2, MT1, and G (MT stands for main terminal).

The BCR8CM-12LB#BB0 TRIAC is a current-controlled device with a wide application range and high sensitivity. It features low on-state resistance, zero-cross turning off when the gate current is zero, no noise generation during its operation, and a wide voltage trigger angle range. It is mainly used as a switching device that can control AC power in circuits, used in heating-regulation systems, rectifiers, and window blinds. In addition, it is suitable for luminaires such as chandeliers and track lights.

Working Principle of a BCR8CM-12LB#BB0 TRIAC

A TRIAC is essentially two thyristors connected in inverse parallel together into a three-terminal device with a common gate and two separate junctions. It is this structure that allows current control in both directions with one gate control. A gate current, flowing between the gate and the main terminal (MT2), triggers the TRIAC, allowing the main current to flow between MT1 and MT2 and thus controlling the power supplied to the load.

When the gate current exceeds a certain level (the gate trigger level), the TRIAC is triggered and the power to the load is enabled. The TRIAC will remain on until the current between the main terminals reaches zero, or when the gate current falls below a certain level, in which case the TRIAC will turn off automatically.

The TRIAC can then be switched on by an alternative means, such as a switch. When the switch is opened, the TRIAC is triggered and turns on again. The TRIAC can also be triggered directly by applying a current to the gate, which opens the TRIAC and allows current flow between the main terminals. This is the most common method used to control TRIACs.

Applications

BCR8CM-12LB#BB0 TRIACs are widely used in industry for phase control applications, including lighting control, speed control of motors, and switching relays. They are also used in consumer electronics such as dimmers and power supplies. They are used in many other industrial applications such as heaters, household appliances, and resistor networks.

In low-voltage electronic circuits, they can be used to provide remote control or to simulate a latch, a type of FET switch. In higher power applications, they can be used to control induction motors to provide AC motor speed control. In a simplified form, they can replace a complicated mechanical switch setup in applications like holiday lighting and similar events.

Conclusion

The BCR8CM-12LB#BB0 TRIAC is a versatile, three-terminal semiconductor device used for current control in both directions. It is widely used in industry for phase control applications, lighting control, and speed control of motors. It provides low on-state resistance and wide voltage trigger angles, making it ideal for many applications.

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