BTA225-800B,127

Thyristors - TRIACs, also known as Triode Alternating Current Switch, are semiconductor devices that are able to control the flow of alternating current into a load. The most typical applications of these devices are in light dimmers, motor speed control and power control system. Among its many transistor-like features, it can switch the current both in positive and negative directions, by turning off and on the device.

The BTA225-800B,127 is a 630V, 4A Triac device manufactured by ST Microelectronics. It can withstand reverse blocking voltage up to 830V, peak off-state current of 16mA and on-state resistance of 1.8 ohms. Its maximum gate power discharge is 100mW and gate current ranges from 3mA to 20mA.

As a power semiconductor, the BTA225-800B,127 can be used in various applications, including AC switchgear, soft start motor control, surge protection, energy and power control systems. In light dimmers, for instance, the BTA225-800B,127 can be used to achieve the required dimming capabilities by controlling the current to the lightbulb. The device is also used in power factor correction circuits, lighting systems and uninterruptible power supply systems.

The BTA225-800B,127 features a non-sensitive gate operation and negative gate triggering capability. This means that the device can be triggered through a negative or positive pulse, and its gate is immune to voltage and current transients, avoiding the risk of false triggering and malfunction. Moreover, it features a built-in Thermal Shut-off and Enhance Reverse Voltage protection. The former helps prevent overheating, while the latter prevents current flow from the device\'s main terminal to the gate called “latch up”.

The working principle of the BTA225-800B,127 is based on the concept of charge-balance. Unlike a common switch operation, which involves a single switch operation to control the current, the BTA225-800B,127 in charge-balance allows for a dual switch operation for accurate current regulation. When the device is triggered, it controls the current through the two switch operations. When the current is transferred from the main terminal to the gate terminal, the gate reaches a positive potential and the current is transferred from the gate terminal to the main terminal, and the gate reaches a negative potential. This balance of current allows for a more accurate regulation of the current and voltage, giving the device a better performance in several applications.

The BTA225-800B,127 is thus an ideal choice for those applications that need accurate current control and it is able to provide superior efficiency, with greater reliability and robustness.