VDRH07K300BSE

Series:	VDRH
Part Status:	Active
Lead Free Status / RoHS Status:	--
Maximum AC Volts:	300V
Maximum DC Volts:	385V
Varistor Voltage (Min):	423V
Varistor Voltage (Typ):	470V
Varistor Voltage (Max):	517V
Current - Surge:	1.75kA
Energy:	42J
Number of Circuits:	1
Capacitance @ Frequency:	130pF @ 1kHz
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Through Hole
Package / Case:	Disc 9mm

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Introduction

TVS – Varistors, MOVs, also known as transient voltage surge suppressors (TVSS), are electronic components designed to protect against power surges, electrical shorts, lightning, and other overvoltage conditions by quickly diverting current away from sensitive components, thus preventing their premature failure or destruction. The VDRH07K300BSE is an example of one such device.

Application Field

VDRH07K300BSE is a varistor specifically designed for handling transient voltage surge, overvoltage, and high-current applications. This electronic component has a working voltage of 300 volts and is capable of safely absorbing up to 700 watts with a high energy surge rating of 2-6 Joules per pulse. It is widely used in a variety of fields, such as automotive and industrial electronic systems, consumer electronics, telecommunications systems, power grids, and aerospace.

Working Principle

At normal working voltages, the VDRH07K300BSE behaves like a resistor and dissipates incoming power as heat without any significant voltage drop across it. When a voltage surge, overvoltage, or high current flows through it, however, the varistor behaves like an inductor and directs much of the energy away from the sensitive components, thus preventing damage.The VDRH07K300BSE works on the principle of avalanche effect; when the voltage reaches the varistor’s specified surge withstand rating, the germanium material in the device’s internal structure begins to avalanche, thereby creating a path for the current to flow and reducing both the current and the voltage of the incoming surge. This effect also creates a noise that can be heard on an oscilloscope, which serves as a warning of the impending surge or overvoltage.

Conclusion

The VDRH07K300BSE is a high-efficiency varistor designed to protect delicate electronic components from surges, overvoltage, and high current. Its avalanche effect enables it to quickly divert electric current away from sensitive components, thereby preventing their destruction and safeguarding the equipment as a whole.

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