MOV-20D221K

MOV-20D221K is an important component in TVS (Transient Voltage Suppression) diode solution, which is a member of the important varistor series. This component is used to suppress transients in power supply lines and according to the minimum breakdown voltage, can be used against induced transients. The MOV (Metal Oxide Varistor) series can perform with the highest efficiency among the other components.

MOVs are transistors which have an oxide layer between their contacts and hence have a wide current flow. They are generally used to protect circuitries against unexpected voltage spikes. Generally, MOVs have two different materials, one of which is negatively charged and the other is positively charged and these materials are used to create an oxide layer between them. Depending upon the breakdown voltage, the material used in MOVs can be changed.

The working principle of MOV-20D221K can be explained by its structure. It consists of two discs, one made of dielectric material such as plastic or porcelain and the other made of metal. When a voltage is applied between the discs, the voltage causes the metal disc to generate a voltage of its own. The generated voltage creates an electric field between the two discs. This electric field creates a current flow through the oxide layer depending on its breakdown voltage.

When there is an over-voltage, the MOV can absorb a large amount of current, this current can be absorbed in two ways: either through a thermal effect, in which the current creates heat within the MOV; or a direct electrical effect, in which the current causes a breakdown of the oxide layer. Depending on the type of MOV, the threshold value of the current that the MOV can withstand can be set. In case of MOV-20D221K, its threshold value can be set as low as 175Vrms.

MOV-20D221K can be used in a wide range of applications including: TV applications, computers, automotive applications, and audio/video equipment. Due to its low breakdown voltage, it can also be used to provide protection against induced transients. It has been tested to be reliable and efficient in applications even during high-temperatures.

In automotive applications, MOV-20D221K can be used along with a Resettable Overvoltage Protection (ROP) device to provide protection against short-circuit voltages. The ROP device is designed to detect surges when the electrical system fails and shut off the system. When the voltage returns to its normal value, the system will be reset automatically.

In audio/video applications, MOV-20D221K can be used along with an audio/video surge protection circuit. The surge protection circuit is designed to protect sensitive audio/video components from power-related surges. The MOV is used to absorb any excessive voltages, while at the same time retarding any further excessive current.

Overall, MOV-20D221K is a cost-effective and efficient solution for protection against transient over-voltages. This component is highly reliable and is specifically designed to protect sensitive electronic components. Depending upon the application, this component can be combined with other components to form an effective circuit for protection against surges.