V12ZT05PX2855

Varistor Voltage (Typ):	12.5V
Package / Case:	Disc 5mm
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 85°C (TA)
Capacitance @ Frequency:	1700pF @ 1MHz
Number of Circuits:	1
Energy:	0.14J
Current - Surge:	50A
Varistor Voltage (Max):	16V
Series:	ZT
Varistor Voltage (Min):	9V
Maximum DC Volts:	8V
Maximum AC Volts:	6V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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V12ZT05PX2855 application field and working principleVaristors, or Voltage-dependent Resistors (VDRs), are discrete nonlinear devices with a highly nonlinear, voltage-dependent capacitance. Their purpose is to protect electrical and electronic equipment from overvoltage transient events, surges, or spikes on a power supply line. A VDR usually has two terminals, and is usually composed of a set of metal oxide layers separated by a dielectric layer, exhibiting a large resistance when the voltage is low, and a lower resistance when the voltage increases. The V12ZT05PX2855 is a VDR product manufactured by ON Semiconductor. In this article, we will discuss the applications and working principle of the V12ZT05PX2855.The V12ZT05PX2855 is designed for use as an overvoltage protection device for secondary side applications. Specifically, it is designed to offer protection from surges and spikes on the DC-DC converter secondary to the power supply input. This product is designed for use in applications such as telecom base stations and networking devices. It can also be used in industrial motor drives or power supplies.When operating, the V12ZT05PX2855 diverts most of the transient current during an overvoltage event, limiting the overvoltage transient. The device is designed to provide overvoltage protection for both primary and secondary sides of the power supply. The device also offers a very low capacitance of 1.2pF, which helps to reduce EMI by minimizing the amount of voltage ripple to the power supply output.The working principle of the V12ZT05PX285 is based on the principle of varistor action. The device consists of two electrodes with a ceramic layer between them, and this is surrounded by a dielectric material. The size and composition of the electrodes and dielectric material determine the characteristics of the voltage-dependent resistance of the device. When the voltage across the electrodes exceeds a certain value (the “clamping voltage”), the current flows through the device. This causes a reduction in the voltage across the device, and thus prevents the overvoltage event from reaching the load.In conclusion, V12ZT05PX2855 is a VDR product designed for use as an overvoltage protection device for secondary side applications. The device is designed to provide overvoltage protection for both primary and secondary sides of the power supply. Its features include a very low capacitance of 1.2pF, which helps to reduce EMI by minimizing the amount of voltage ripple to the power supply output. The device works on the principle of varistor action, in which a ceramic layer between two electrodes is surrounded by a dielectric material, and when the voltage exceeds the “clamping voltage”, current flows through the device, reducing the voltage and preventing overvoltages.

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