V481DHB34

Varistor Voltage (Typ):	750V
Package / Case:	Square 34mm, Tabs
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 85°C (TA)
Capacitance @ Frequency:	2700pF @ 1MHz
Number of Circuits:	1
Energy:	650J
Current - Surge:	40kA
Varistor Voltage (Max):	825V
Series:	DHB34
Varistor Voltage (Min):	675V
Maximum DC Volts:	640V
Maximum AC Volts:	480V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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TVS - Varistors, MOVs

When metal-oxide varistors, MOVs, and transient-voltage-suppression (TVS) devices such as the V481DHB34 are mentioned in discussion, it may be difficult at times to comprehend their intended purpose, field of application, and working principles. This article will aim to provide a clear explanation of the V481DHB34’s field of application and working principle. The V481DHB34 device is a bi-directional, unidirectional TVS diode. It is enclosed in a SOT23-3 plastic package, whose dimensions are 3.0 mm x 1.3 mm x 1.0 mm. Its maximum peak power dissipation is 500 W, with a voltage clamping of 33 VDC ±7.4 V.Since the V481DHB34 is a TVS diode, it is typically used as a transient voltage and current protection element. As a result, its primary field of application is in surge suppression. Its unidirectional characteristics make it idea for use in general-purpose semiconductor protection. It can also be effective in securing sensitive electronic equipment located near power-transmission lines - for example, crucial equipment found in hospitals, offices, and banks.When analyzing the working principle of the V481DHB34, it will be easiest to first understand its construction. As a zener diode, it contains two regions of semiconductor material - one is made up of lightly doped, or n-type material, while the other consists of heavily doped, or p-type material. Separating the regions of the diode, a junction is formed. Surrounding the junction is a layer of dielectric material and the whole device is encased in an insulating package.When the voltages across the V481DHB34 are in normal operating limits - that is, below 33 volts - the device is essentially an open circuit, or more accurately a non-conductive state. However, when the voltage varies significantly and if the applied voltages exceed the threshold limit of 33 volts, current begins to flow from the negative to the positive side of the circuitry. This is what is known as the clamping voltage. That is, the amount of voltage required for the diode to become conducting. In addition, the V481DHB34 can also provide line ESD protection, which is another common application for TVS diodes. It is important to note, however, that the ESD ratings of the TVS diode will depend on the inherent resistance of the protection line.To sum it up, the V481DHB34 is a bi-directional, unidirectional TVS diode which has a variety of potential applications. It is most popularly used for surge suppression, although it can also be used for ESD protection. Its ability to limit the clamping voltage significantly adds to its utility, as it makes it ideally suited for the protection of sensitive electronic equipment.

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