DB4 Discrete Semiconductor Products

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Thyristors are a type of semiconductor devices that have a wide range of applications in both analogue and digital circuits. They are composed of three or four terminals, providing both switching and control functions in electronics. Thyristors include a variety of devices, such as DIACs, SIDACs and others.

1. What are DIACs?

DIACs, or diode-controlled AC switches, are a three-terminal thyristor that is used to control two-wire or three-wire AC circuits. DIACs are designed to be triggered by an applied voltage and to remain in a conducting state until the current through the device begins to fall below a specified holding current. DIACs are also referred to as bidirectional thyristors, since they can conduct current in both directions when triggered.

2. How do DIACs Work?

The inner circuit of a DIAC consists of two anodes and a gate connected to a PN junction diode. When a negative voltage is applied to the gate, the junction breaks down, allowing current to flow between the two anodes. This current will remain until the current drops below the holding current level, at which point the gate voltage must be reversed in order to maintain conduction. DIACs are commonly used in AC switching applications such as relays, timers and level detectors.

3. What are SIDACs?

SIDACs, or semi-conducting diodes, are four-terminal thyristors that are used to control DC and AC circuits. They are triggered by an applied voltage and will remain in a conducting state until the current falls below a specified holding current. Unlike DIACs, SIDACs are not symmetrical and will conduct current in only one direction when triggered.

4. How do SIDACs Work?

SIDACs are composed of two PN junction diodes connected in a series configuration. When a positive voltage is applied to the gate terminal, the junction below it will break down, allowing current to flow. The SIDAC will then remain in a conducting state until the current falls below the holding current, at which point the gate voltage will have to be reversed in order to maintain conduction. SIDACs are commonly used in motor control and other DC applications.

5. Application of DB4 Thyristors

DB4 thyristors are widely used in multiple industries, including industrial, automotive and aerospace applications. They are commonly used for switching, controlling and protecting AC and DC motors, relays, timers, level detectors and other applications. They are also used in power supplies and other DC/AC applications.

DB4 thyristors are typically used in high-power applications, as they can handle up to 200A of current. They are also highly reliable and provide excellent switching performance. Other advantages of DB4 thyristors include cost-effectiveness and energy efficiency.

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