82537040 Circuit Protection

Varistor Voltage (Typ):	8V
Package / Case:	0402 (1005 Metric)
Mounting Type:	Surface Mount, MLCV
Operating Temperature:	-40°C ~ 125°C (TA)
Capacitance @ Frequency:	220pF @ 1MHz
Number of Circuits:	1
Energy:	0.04J
Current - Surge:	20A
Varistor Voltage (Max):	9.6V
Series:	--
Varistor Voltage (Min):	6.4V
Maximum DC Volts:	5.5V
Maximum AC Volts:	4V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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TVS - Varistors, MOVs

Varistors and metal oxide varistors (MOVs) are used to protect a variety of electronic equipment from high voltage transients. They are often referred to as "transient voltage suppressors", and are manufactured in a variety of sizes and ratings, depending on their application. The technology behind the varistor or MOV is the avalanche effect. This is the phenomenon whereby a diode that is reverse-biased will breakdown when a certain voltage is applied across it, and the current flowing through the diode will increase exponentially. A varistor is an array of diodes connected in parallel, in such a way that when exposed to a high voltage transient, the avalanche effect will be triggered, and the voltage will be diverted away from the circuitry, thus protecting it from damage.Varistors and MOVs are typically marked with a product code, such as the 8253 7040. This code indicates the characteristics of the device. In the case of the 8253 7040 code, the first 4 digits signify the manufacturer (in this case, AVX), while the last 4 digits represent the device\'s rating. The rating indicates the level of the operating voltage - in the case of the 8253 7040, it is rated for 70 volts.The 8253 7040 can be used in a variety of applications, ranging from consumer electronics to telecommunications equipment. In consumer electronics, it can be used to protect against transients caused by lightening or other surges. In computer power supplies, it can protect against spikes caused by power cycling or overloads. In telecommunications and other equipment, it can be used to protect against high voltage transients that can occur during system fault conditions. The working principle of the 8253 7040 is relatively straightforward. When exposed to a transient voltage, the varistor acts as a “short circuit”, drawing the excess current away from the protected circuit. Since the varistor is connected in parallel with the circuit, it acts as a “load” and dissipates the energy of the transient. This is how the 8253 7040 protects against high voltage transients.The 8253 7040 is designed to operate within certain temperature range and should be mounted in a well ventilated area so that it does not overheat. It is also important to keep the varistor away from any direct contact with other heat-producing components in the circuit, as this could lead to premature failure.In conclusion, the 8253 7040 is a varistor or metal oxide varistor (MOV) that is designed to protect circuits and equipment from high voltage transients. Its working principle is based on the avalanche effect, where a reverse-biased diode will breakdown when exposed to a certain voltage, diverting the excess current away from the circuitry. By connecting it in parallel with the circuit, the 8253 7040 can act as a “load”, dissipating the energy of a transient. It is important to mount the varistor in a well ventilated area, and to ensure that it does not come into contact with other heat-producing components in the system.

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