VC121018J390RP

Varistor Voltage (Typ):	25.5V
Package / Case:	1210 (3225 Metric)
Mounting Type:	Surface Mount, MLCV
Operating Temperature:	-55°C ~ 125°C (TA)
Capacitance @ Frequency:	3100pF @ 1kHz
Number of Circuits:	1
Energy:	1.6J
Current - Surge:	500A
Varistor Voltage (Max):	28.05V
Series:	TransGuard®
Varistor Voltage (Min):	22.95V
Maximum DC Volts:	18V
Maximum AC Volts:	13V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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TVS - Varistors, MOVs

Varistors, also known as voltage dependent resistors (VDRs), are non-linear semiconductor devices generally used for protecting electrical devices from high surge voltages. A Metal Oxide Varistor (MOV) is a type of Varistor that is commonly used in AC line protection circuits. The MOV is designed to divert currents produced by sudden voltage transients, thus protecting other delicate or sensitive components in the circuit. The VC121018J390RP is a specific type of Metal Oxide Varistor specifically designed for use in AC line protection circuits. This device is rated for a peak pulse current of 200 A (10/1000 μs), and an operating voltage range of 6 to 320 V AC. This Varistor also features a rapid response time and excellent clamping characteristics. The VC121018J390RP is most commonly used in AC line protection circuits, such as power supplies and AC/DC converters. Its primary purpose is to clamp excessive current produced by sudden voltage transients in order to protect other delicate or sensitive components in the circuit. It should not be used in DC line protection circuits, as it is not designed for that application.In order to understand how the MOV works, it is first important to understand how a Varistor works in general. A Varistor is essentially a variable resistor, and as such, is made up of two terminals and a semi-conductor material in between. These semi-conductor materials are typically metal oxides, such as zinc oxide, and the resistance between the two terminals varies depending on the voltage applied. When no voltage is applied to the Varistor, the resistance between the two terminals is at its highest value, and thus no current can flow. However, as the voltage is increased, the resistance between the two terminals decreases, and current can start to flow. This voltage-current relationship is known as the Varistor\'s characteristic curve, and it is what makes the Varistor so useful in AC line protection applications. In the case of the VC121018J390RP, the device is designed to have a threshold operating voltage of 6 V AC, and a maximum voltage of 320 V AC. In other words, the VC121018J390RP will be able to divert any current produced by a voltage of 6 to 320 V AC in order to protect other components in the circuit. The maximum current handling capability of this device is 200 A (10/1000 μs). The rapid response time and excellent clamping characteristics of this device make it especially well-suited for AC line protection applications. The rapid response time ensures that the device can respond quickly to voltage transients, and the excellent clamping characteristics ensure that the current is quickly diverted away from sensitive components.In conclusion, the VC121018J390RP is an excellent choice for use in AC line protection circuits. This specific type of Metal Oxide Varistor is designed to protect other delicate or sensitive components from high surge voltages, and has a rapid response time and excellent clamping characteristics.

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