V8RA8X2749 Circuit Protection

Varistor Voltage (Typ):	8.6V
Package / Case:	Radial, Box
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 125°C (TA)
Capacitance @ Frequency:	3000pF @ 1MHz
Number of Circuits:	1
Energy:	0.40J
Current - Surge:	150A
Varistor Voltage (Max):	11.2V
Series:	RA
Varistor Voltage (Min):	6V
Maximum DC Volts:	5.5V
Maximum AC Volts:	4V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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IntroductionV8RA8X2749 are part of a family of TVS - Varistors, MOVs, developed by Vishay Intertechnology. These devices are designed to protect electrical systems from transient voltage spikes due to overvoltage surges and to suppress electrostatic discharge (ESD) as well as radio frequency interference (RFI). This article aims to discuss the application field and working principle of V8RA8X2749. Application FieldV8RA8X2749 are widely used in telecommunications, automotive, computer, industrial, and consumer products for overvoltage/over-current protection. They provide protection for circuit boards and other connected equipment against over-voltage spikes caused by lightning, power cross, inductive loads, and electrostatic discharge (ESD). Varistors, including V8RA8X2749, are ideal components for protecting vulnerable I/O systems, such as digital, analog, and mixed-signal ICs, FPGAs, ASICs, memory devices, modems, and other components. Furthermore, these products can be used to suppress the EMI/RFI signals generated by the circuit and protect other connected circuits from these signals.Working PrincipleV8RA8X2749 use metal-oxide-varistor (MOV) technology to provide overvoltage protection. The device is composed of a number of elements made of zinc oxide (ZnO) that are connected in series. When a voltage is applied, each element becomes positively biased and conducts current. The individual elements are mutually isolated by an air gap.When an incoming voltage spike is above the rated threshold, the MOVs will clamp the voltage and reduce the damaging peak voltage. In other words, the varistor will act as a voltage clamp that limits the voltage spike to an acceptable level. The peak voltage spike is clamped at the lowest value allowed by the material composition and the geometry of the varistor.When the incoming voltage is below the rated threshold, the MOVs remain in their high-resistance state and no current flows through them. That’s why V8RA8X2749 can also be used for normal-mode surge protection.ConclusionIn conclusion, V8RA8X2749, a type of varistor, provides overvoltage/overcurrent protection for electronic systems and allow systems to withstand higher voltage and current levels without the damage. This makes them ideal for EMI/RFI protection and surge protection applications. The operating principle of V8RA8X2749 is based on the metal-oxide-varistor technology, in which the varistor acts as a voltage clamp and limits the voltage spike.

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