MOV-07D821K

Varistor Voltage (Typ):	820V
Package / Case:	Disc 7mm
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Capacitance @ Frequency:	60pF @ 1kHz
Number of Circuits:	1
Energy:	40J
Current - Surge:	1.2kA
Varistor Voltage (Max):	902V
Series:	--
Varistor Voltage (Min):	738V
Maximum DC Volts:	675V
Maximum AC Volts:	510V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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TVS - Varistors, MOVs

MOV-07D821K is a type of transient voltage suppression (TVS) device. It belongs to the class of overvoltage protection devices known as metal-oxide varistors (MOVs). MOV-07D821K is an especially useful choice for smaller electronic systems because of its low capacitance and fast response due to its higher thermal impedance. MOVs are used to protect electronic circuits from voltage spikes, such as those created by inductive/magnetic sources, which can cause damage or malfunction of components in the circuit. When an overvoltage or transient voltage appears across the MOV-07D821K, its resistance suddenly reduces, creating a low-impedance path for the circulating current. This process effectively reduces the voltage to the protected device and dissipates the harmful electrical surge energy. The MOV-07D821K is particularly useful for applications that require higher levels of transient protection. Compared to traditional varistor products, the MOV-07D821K offers improved capacitance and energy handling capabilities. Its high thermal impedance and fast response also help reduce risk of damage caused by repetitive transients due to its faster start up time. In general, the MOV-07D821K can be used for board-level circuit protection in various electronic systems, such as LED lighting systems, industrial control systems, automotive systems, telecom systems, computer systems, and consumer electronics products. The device is suitable for applications operating at a wide range of voltages, from less than 1 voltage to more than 10 kilovolts. The working principle of MOV-07D821K TVS depends on its unique construction. It consists of a zinc-oxide (ZnO) ceramic disc covered with two metal plates. The disc contains many small particles of conductive material, such as zinc oxide, which act as static diodes. When an overvoltage or transient voltage appears across the MOV-07D821K, the voltage polarizes the particles, which become conductive, and the resistance across the device becomes very small. This reduces the voltage to the protected device and, due to its high thermal impedance and fast response, dissipates the energy quickly, before it can cause serious damage. In addition to its excellent overvoltage protection performance, MOV-07D821K also provides a high level of EMI/RFI protection, which helps prevent interference between different electronic systems. It also has a low clamping voltage for increased protection. In conclusion, MOV-07D821K is an ideal choice for transient voltage suppression in a wide variety of applications due to its high performance, high capacitance, fast response, and low capacitance. Its ability to reduce stress in the protected system, thanks to its lower clamping voltage and higher thermal impedance, and its high level of EMI and RFI protection make it an excellent choice for many applications.

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