VE0805K121R020 Circuit Protection

Varistor Voltage (Typ):	33V
Package / Case:	0805 (2012 Metric)
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 150°C (TA)
Capacitance @ Frequency:	290pF @ 1kHz
Number of Circuits:	1
Energy:	0.40J
Current - Surge:	120A
Varistor Voltage (Max):	36.3V
Series:	Automotive, AEC-Q200, VE
Varistor Voltage (Min):	29.7V
Maximum DC Volts:	26V
Maximum AC Volts:	20V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

Varistors, also known as Voltage Dependent Resistance (VDRs) or voltage-sensitive resistors, are electronic components that are designed to offer both protection and control in power supply and power management applications. The VE0805K121R020 is a metal oxide varistor (MOV) that has an operating voltage range of 10-300VAC/DC. This makes the VE0805K121R020 suitable for a wide variety of applications.

VE0805K121R020 Application Field

The VE0805K121R020 is designed for use in a variety of applications, including surge protection, electromagnetic interference (EMI) or radio frequency interference (RFI) suppression, and overvoltage protection.Surge Protection: The VE0805K121R020 is designed for use in applications that require protection against transient surges or spikes, such as power line surges caused by lightning. The MOV is designed to automatically detect and divert the surge away from the connected device, providing protection from voltage spikes.EMI/RFI Suppression: The VE0805K121R020 is designed for use in applications that require low-pass filtering of EMI/RFI noise, such as in electronic control systems. The MOV effectively filters out the noise, preventing it from interfering with the performance of the connected device.Overvoltage Protection: The VE0805K121R020 is also designed for use in applications that require protection from overvoltage conditions, such as in power systems. The MOV is designed to detect when the voltage exceeds the predetermined threshold and then divert the excess voltage away from the connected device, preventing any damage to the device due to overvoltage.

VE0805K121R020 Working Principle

The VE0805K121R020 is an MOV, which is an electronic component that consists of a metal oxide layer that is sandwiched between two electrodes. When a voltage is applied to the MOV, the oxide layer acts as a semiconductor, allowing current to flow from one electrode to the other.When the MOV is exposed to a surge, the voltage across the MOV rapidly decreases, and current quickly flows from one electrode to the other. This action diverts the surge away from the connected device.When the voltage across the MOV falls below a predetermined threshold, the MOV resets itself and begins to act as an insulator again, preventing any further flow of current.Similarly, when an overvoltage occurs, the voltage across the MOV increases rapidly, and current flows from one electrode to the other. This action diverts the excess voltage away from the connected device.

Conclusion

The VE0805K121R020 is a metal oxide varistor (MOV) that is designed for use in a wide variety of applications, including surge protection, EMI/RFI suppression, and overvoltage protection. The MOV is designed to offer protection from transient surges or spikes, as well as filtering out EMI/RFI noise and preventing damage due to overvoltage. The VE0805K121R020 operates by using the metal oxide layer as a semiconductor, allowing current to flow from one electrode to the other when a voltage is applied and diverting the excess voltage away from the connected device.

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