MOV-10D821K Circuit Protection

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TVS (transient voltage suppression) devices are designed to protect sensitive electronic components from electrical overstress caused by transients that occur during operation due to electrical discharges or surges. Varistors, sometimes referred to as MOVs (metal oxide varistors) are popularly used as TVS devices. MOV-10D821K is one such varistor that is used in many applications for protecting the circuits from overvoltage and overcurrent.

MOV-10D821K is a low-cost, compact varistor designed to provide unidirectional overvoltage protection. It is designed for use in electrical equipment or circuits where voltage transients can be expected. It is a bidirectional device, meaning that it can protect both the positive and negative voltage lines in the power supply. It is a low capacitance varistor with a capacitance of only 0.4pF. MOV-10D821K can be used in protection circuits from voltage transients ranging from 50V to 700V and from low to high frequency transients. This versatile device is also suitable for clamping down voltage spikes, such as ESD (electrostatic discharge) pulses produced by static electricity, induced by lightning, and caused during switching operations.

MOV-10D821K is designed to operate at the maximum voltage rating of its dissipation capability. This means that it will dissipate the energy from the voltage transient before the device is destroyed. It has a high peak current rating of up to 800 A and a clamping voltage of 10V. It also has a temperature coefficient of 2%/K over a wide temperature range. The device is quite robust and is able to also absorb up to 2.5 Joules of energy while being operable. It also has a very low leakage current of 0.01uA.

The MOV-10D821K is widely used in consumer electronics, telecom equipment, industrial machinery, lighting systems, domestic appliances, power supplies and AC/DC applications. It is also capable of absorbing up to 1W of power, which makes it ideal for use in power supply applications. It is also suitable for automotive and ITE (information technology equipment) applications due to its high surge current and low leakage currents. Its low capacitance makes it a good choice for high frequency transient protection in many applications.

The working principle of MOV-10D821K is basically based on the idea of using a high energy metal oxide varistor (MOV). The MOV comprises several zinc oxide layers that are sandwiched between two end electrodes, with each layer having a different material composition and specific characteristics. When a voltage transient surpasses the device\'s rated voltage, the MOV starts to conduct. The conducting layers act like a resistor, limiting the transient voltage and clamping it at a certain level. This limits the energy that is released and helps protect the circuit. The energy is then dissipated as heat.

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