BT139X-800/L02Q

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Thyristors - TRIACs

BT139X-800/L02Q application field and working principle

Thyristors are a type of semi-conductor device that is used in electronics and power control technologies, with TRIACs being one of the main types available. The BT139X-800/L02Q is a specific typse of TRIAC designed for use in mains power control and applications that require a low on-state resistance (R_ON) at a capacitive load. It is mainly used in power supplies, lighting control systems and household appliances, among many others.

The BT139X-800/L02Q operates in a similar way to a standard TRIAC, but has the advantage of being highly sensitive which makes it particularly suited for controlling the on/off operations of electrical items via a tiny current with a 48V and 0mA trigger. In a typical circuit, the BT139X-800/L02Q can be used to switch 120VAC at up to 12A and provide an isolation voltage of up to 3500V.

The working principle of the BT139X-800/L02Q is simple, yet highly effective. It uses the Gate Trigger Signal to create a voltage breakdown inside the chips using the constructed Insulated-Gate Field-Effect Transistor (IGFET). This heat generated inside the chip is then used to switch on the power supply, and the number of Gate Trigger Signals used is determined by the specific application and load requirements.

Once the Gate Trigger Signal has enabled the current in the BT139X-800/L02Q, the voltage across the terminals will be increased until the current in the device becomes constant. This is known as the Quadrant Operation or AC load control, which is used in a variety of applications that require accurate and precise control of the power.

The BT139X-800/L02Q also has the advantage of being able to switch off the power again with more precision. This is done by controlling the off-time of the device. To do this, the Gate Trigger Signal is used to send a current signal to the device to turn off the power. This is known as the ‘Latch-off Characteristic’.

In conclusion, the BT139X-800/L02Q is a highly efficient and versatile TRIAC suitable for a wide range of power control applications. Its low on-state resistance and sensitivity make it an ideal choice for applications demanding precise control over electrical power. Moreover, its sensitive Latch-off Characteristic means that the off-time of the device can be controlled with ease.

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