QK008NH4RP

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Thyristors - TRIACS are semiconductor switches with three terminals, developed for the purpose of controlling the current in a circuit. The acronym TRIAC stands for "Triode for Alternating Current". It is a three-terminal device with a control gate to initiate and limit the current flow in either direction. It is used in many applications such as light dimmers, LED drivers, power electronics, motor speed control, and industrial control.

The QK008NH4RP is a silicon bidirectional Triac with 200V breakdown voltage and 5A rated current. It is typically used in circuits with a low duty-cycle and where the load requirements are very small. It exhibits bidirectional voltage and current conduction in both directions, making it suitable for AC or DC applications. The gate control voltage determines the delay and angle of operation of the Triac, allowing it to be operated at a predetermined angle in response to a gate voltage. Because of its positive temperature coefficient, it can be used in systems where a precisely controlled output current is required.

The QK008NH4RP does not require a separate power source for switching, as it utilizes the rectified line voltage for its operation. Its three terminals are the anode, cathode and gate. The anode and cathode are connected to the AC line voltage, while the gate is connected to the control voltage source. When the gate-to-anode voltage exceeds the specified threshold voltage, the device starts conducting, allowing current to flow between the anode and cathode terminals.

The device operates in a threshold mode, in which the trigger voltage required to turn on the device is dependent on temperature and the current passing through the device. The system designer must ensure that the control voltage applied to the gate is sufficient for the desired operation. The QK008NH4RP offers low on-state losses and high power density, making it suitable for applications where a small package size is desired.

The QK008NH4RP is widely used in the consumer electronics industry, such as digital video recorder (DVR) and set-top box (STB) systems. It is also used in industrial applications, such as motor speed control, AC power regulation and AC current sensors. The device is capable of handling high currents and low operating voltages. The small size, low cost and high efficiency of the QK008NH4RP makes it a preferred choice for many applications.

The QK008NH4RP is a rugged and reliable component, making it well suited for use in high temperature, extreme voltage, and long-term operation systems. It also offers low gate-current triggering and low power consumption, so it can be used in power-efficient applications. Its simple control interface makes it an excellent component for use in digital control systems.

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