T405-600B

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Thyristors - TRIACs are semiconductor devices with three terminals and three N-type layers and P-type layers. They are often used in controlling power transmitting and motor speed driving. T405-600B is one kind of TRIAC, which is designed for high on-state current and the most commonly used, suitable for general AC switching and phase control. This article will discuss about its application field and working principle.

Application Field

T405-600B is an AC switch and phase-control TRIAC device consisting of an N-type and P-type, connecting on a semiconductor substrate. The TRIAC provides symmetrical break-over characteristics, allowing it to be used as low voltage switch or phase control transistor with high dependability. Its components structure is designed to improve the thermal and electrical performances and reduces the number of parts and assembly operations, thus making it ideal for general AC switching and phase control applications, especially such as inductive lamps, AC motor control, incandescent dimmers, and household appliances.

Working Principle

The working principle of T405-600B is based on the idea that, when the electrical switch is connected to an alternating current (AC) source, which sends a current through the circuit, the gate triggers the TRIAC. This makes the device conduct current. When the AC voltage changes, the gate will stop triggering and the TRIAC will stop conducting current, thus breaking the circuit. The T405-600B is designed to be triggered by an AC waveform and its gate current must exceed a certain amount in order for it to be turned on. The amount of current required for the T405-600B to turn on is known as its gate trigger current, which is specified in the device’s datasheet. When the gate current reaches the trigger current and begins to rise above it, the T405-600B will begin to conduct and the LED will light up indicating that the TRIAC is “on”.

T405-600B has several other features, including a built-in temperature compensation circuit that ensures the TRIAC turns off before it becomes thermally damaged, and a low voltage trigger circuit that prevents the TRIAC from triggering erroneously on low voltage waveforms. Additionally, it has a built-in surge protection circuit that prevents current spikes, which are caused by the TRIAC self-commutating.

Conclusion

T405-600B is an AC switch and phase-control TRIAC device, which has several features and is suitable for general AC switching and phase control applications. It has a built-in temperature compensation circuit, a low voltage trigger circuit, and a surge protection circuit that protect the device from accidental damage. It also has a gate trigger current that must be satisfied in order for the device to turn on.

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