VE1210K251R035 Circuit Protection

Varistor Voltage (Typ):	56V
Package / Case:	1210 (3225 Metric)
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TA)
Capacitance @ Frequency:	670pF @ 1kHz
Number of Circuits:	1
Energy:	2.2J
Current - Surge:	250A
Varistor Voltage (Max):	61.6V
Series:	Automotive, AEC-Q200, VE
Varistor Voltage (Min):	50.4V
Maximum DC Volts:	45V
Maximum AC Volts:	35V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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TVS - Varistors, MOVs: VE1210K251R035 application field and working principle

Varistors, Metal Oxide Varistors (MOVs) are essential in the design of electronic and electrical equipment. In this article, we showcase a specific model of varistor: the VE1210K251R035. We analyze the application fields where this model of varistor is popular, as well as the working principle behind it.The VE1210K251R035 Varistor is a metal oxide varistor with a voltage rating of 251V. This model of varistor has a limited AC current rating and is mainly employed as a voltage surge immunity solution. It is provided in a 1210 package, with a maximum surge energy rated at 10J. The most common application fields for this model of varistor are surge protection for automotive equipment, such as ABS/ESP systems, dCDC converters, ECUs, and control units. Apart from these automotive applications, the VE1210K251R035 Varistor is also widely used in Telecom/data and industrial automation, for surge protection of communications ports and data lines, as well as board level protection for industrial control networks.The working principle behind the VE1210K251R035 Varistor is quite simple. It consists of a silicon oxide ceramic structure, with zirconium and bismuth oxides, in powder form, mixed with other elements in trace amounts. It also contains a special doping that controls the resistance and makes the material sensitive to voltage levels.When a voltage exceeds the breakdown level of the ceramic material, electrons are accelerated through the material, creating a region of high current density with an intense electric field. This surge of current is then attenuated. The varistor operates in a non-linear region: when a low-level voltage is applied, the resistance is crushingly high, while at a high applied voltage, the resistance is low. This is the varistor’s inherent voltage-dependent behavior.To conclude, the VE1210K251R035 Varistor is a common choice for many applications, in particular automotive surge immunity. Its main benefits include its compact 1210 package, high surge energy rating, improved resistance to humidity, and superior voltage clamping performance. Its working principle is based on the response to voltage levels, where the resistance is high for low voltages and drops significantly at high voltages.

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