ND420821

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ND420821 is a popular High Voltage Silicon Controlled Rectifier (SCR) module. It is a three pin device with positive (+), negative (-) and control (C) connecting pins. Its maximum current rating is 8A, maximum voltage is 20V, and maximum gate current is 40mA. This module is specifically designed to handle high power applications, like power switching and motor speed control.

The working principle is simple. When the SCR module is connected to a power supply, the positive terminal of the module is connected to the positive terminal of the power source, while the negative terminal is connected to the negative terminal of the power source. The third pin, the control (C) pin, is connected to a signal from the control circuit.

When the signal on the control (C) pin is high, the SCR module allows the current to pass through it when a positive gate voltage is applied. This causes the SCR module to conduct and the load to turn on. When the signal on the control (C) pin goes low, the SCR module does not allow the current to flow, and the load turns off.

The ND420821 SCR module is well suited for numerous applications like power switching, motor speed control, lighting control, temperature monitoring, audio amplifier control, etc. It can be used to switch on/off a load, regulate the speed of a motor, dim lamps, etc. The ND420821 can also be used in combination with other devices like transistors and relay contacts, to create complex logic circuits for controlling industrial machines and equipment.

The advantages of using the ND420821 SCR module are its solid state reliability, high power handling capacity and low cost of manufacturing. It has great potential for integration in a wide range of power control applications and is widely used in industry and consumer electronics.

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