L4004D8TP

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Thyristors - TRIACs

L4004D8TP is a common thyristor component from STMicroelectronics. It belongs to the thyristor family, and more specifically, a broadly used class, the TRIACs. TRIACs (Triode for Alternating Current), also known as bilateral triodes, bidirectional thyristors, or alternate action thyristors, are a type of thyristor with three bi-directional terminals (anode, gate, and cathode). The optimal current-carrying uptake of the component can bear 8A of steady state current, with one-cycle gate power ranging from 1 to 8W.

Applications

Given its alternating current capabilities, combined with its inexpensive price tag and relatively small size, the L4004D8TP component is often used for general purpose switching and phase control applications. For example, it is a common choice for motor speed control, AC voltage regulation, and AC phase shifting in industries such as HVAC (heating, ventilation, and air conditioning). Due to its ability to withstand high temperature, it can also be used in thermal processes, or as a switch or relay for domestic and industrial electrical systems.

Working Principle

The basic operation of a TRIAC is as follows. When the positive terminal of an AC source is connected to its gate, the TRIAC will be ‘switched on’ and current will be passed through the three terminals with the same polarity (assuming the current is of sufficient magnitude). The current can then be stopped once the polarity of the voltage across the gate is reversed. This makes TRIACs particularly useful for controlling AC circuits.

More specifically, the L4004D8TP TRIAC works in the same manner. First, a device successfully detects the zero cross of an AC power source, then a brief pulse is sent to the gate contact. The current is then allowed to pass through the component until the next zero cross detection, at which point the current is blocked.

Conclusion

The accuracy of a TRIAC response depends largely on its gate control properties, which are essential for ac phase control applications. That being said, the L4004D8TP component is a great choice for many applications due to its performance characteristics, its relatively inexpensive cost, and its relatively small size. Furthermore, its excellent triac control specifications, combined with its alternating current capabilities, make it a great choice for controlling AC power circuits.

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