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Thyristors - TRIACs

MAC97A8RLRP Application Field and Working Principle

The MAC97A8RLRP is a 650 V, 8 A Triac manufactured by STMicroelectronics. This type of Triac is ideal for use in AC power control applications with low power signals - such as electronic light dimmers or temperature controllers. It is also suitable for use in AC motor control, power factor correction and active switching circuits.

The MAC97A8RLRP consists of three terminals: main terminals 1 and 2 and control gate 3. Its switching element is a thyristor, also known as a gate turn-off thyristor (GTO). A thyristor is a subset of a semiconductor device consisting of four p-n junctions and usually constructed in an aluminium oxide box. The main terminals of the Triac allow for AC current to flow into the device from a power source, while the control gate is used to activate and deactivate the Triac.

When an AC current enters the Triac, the positive trigger voltage at the control gate 3 will turn the Triac on and a positive current will flow from main terminal 1 to main terminal 2. The magnitude of the output current is dependent on the applied voltage and the device’s power rating. In order to turn the Triac off, the control gate 3 must be connected to the main terminal 2 and be biased with a negative voltage. This will cause the Triac to switch off abruptly.

The MAC97A8RLRP is designed to facilitate low power control signals while preventing wrong connections, as the device has a built-in protection against reverse polarity. This protection mechanism is necessary since the Triac can easily be damaged when exposed to excessive voltage. In addition, the mac97A8RLRP is a low cost and rugged device well-suited for industrial applications.

In summary, the MAC97A8RLRP is a 650 V, 8 A Triac ideal for use in AC power control applications. It consists of three terminals: main terminals 1 and 2 and control gate 3. When an AC current enters the Triac, the positive trigger voltage at the control gate 3 will turn the Triac on and a positive current will flow from main terminal 1 to main terminal 2. To turn off the Triac, the control gate 3 must be connected to the main terminal 2 and be biased with a negative voltage. The MAC97A8RLRP is a low cost and rugged device well-suited for industrial applications.

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