L4004F81

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Thyristors, also known as silicon controlled rectifier (SCRs), are a type of electronic switch, usually used for power control. They are two-terminal, three-terminal, or four-terminal devices that can be connected in an anti-parallel configuration with other SCRs. TRIACs (Triode for Alternating Current) are three-terminal versions of Thyristors, which can switch either direction of current with a low voltage gate signal. The L4004F81 is a TRIAC manufactured by Littelfuse, specifically designed for controlling AC loads in power control applications.

The L4004F81 is a 650V, 4A TRIAC, capable of controlling AC power loads in the range of 10-50A and mains voltages of 120, 230 or 450V. It has a low on-state voltage drop (VDRM), a low holding current (LHO), and a maximum operating temperature of 125°C. In addition to these features, the L4004F81 also has an advanced glass passivated, dual side gate structure, which provides superior protection from thermal runaway events. The TRIAC is also designed with an internal thermal resistance, which can protect the device from sudden surges in temperature.

The primary application for the L4004F81 is in AC power control. It is frequently used in AC motor control circuits, temperature controllers, and phase control applications. The TRIAC is a bidirectional device, capable of switching high power between two end terminals. By controlling the signal applied to its gate, the TRIAC can be used to modulate the flow of power, either increasing or decreasing it depending on the desired load setting. The TRIAC can also be used to switch an AC load on or off, or used in pulse width modulation (PWM) applications.

The basic principle of operation for the L4004F81 is one of the principles of operation common among TRIACs. This principle posits that when a voltage is applied to the main terminals, and a gate signal is applied to the gate terminal, a low voltage current pulse is generated, and a charge builds up in the gate region. If a sufficient voltage is established, the TRIAC device will be triggered, allowing current to be passed through both terminals.

When the gate signal is removed, current is still allowed to flow in both directions, entering the device from one terminal and exiting from the other. To turn off the device, no gate signal is applied, and a reverse breakdown voltage is applied to the main terminals. This will quickly break down the gate junction, and effectively turn the TRIAC off.

In conclusion, the L4004F81 is a TRIAC device manufactured by Littelfuse. It is a relatively high power TRIAC, with a maximum load current of 50A. Recommended applications include AC motor controllers, temperature controllers, phase control, and AC power switching. The device operates according to a standard TRIAC principle of operation, where a voltage applied to the main terminals and a gate signal will trigger the device on and allow current to flow through both terminals. The L4004F81 also offers protection against thermal runaway events.

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