V39ZA20P

Varistor Voltage (Typ):	39V
Package / Case:	Disc 20mm
Mounting Type:	Through Hole
Operating Temperature:	-55°C ~ 85°C (TA)
Capacitance @ Frequency:	12000pF @ 1MHz
Number of Circuits:	1
Energy:	20J
Current - Surge:	2kA
Varistor Voltage (Max):	42.9V
Series:	ZA
Varistor Voltage (Min):	35.1V
Maximum DC Volts:	31V
Maximum AC Volts:	25V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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TVS - Varistors, MOVs

Varistors, also known as voltage-dependent resistors (VDRs) or Vitistors, are non-linear two-terminal electrical components designed to protect electronic circuits from voltage spikes and surges. Metal oxide varistors (MOVs) are one form of varistor, and they are widely used as transient-voltage surge suppressors (TVSS) in power protection applications. The V39ZA20P is a MOV varistor type designed for power-supply protection. This article will discuss the application field and working principle of this device.The V39ZA20P is a non-polarized high-surge-capacity MOV used for power-supply protection. It is particularly well-suited to applications that require low voltage thresholds, such as those that employ switching power supplies. The characteristics of the V39ZA20P include a device voltage of 28 V, capacitance of 31 pF, and energy surge rating of 100 J.The V39ZA20P is designed to operate in a similar manner as a fuse, providing a low-resistance path to divert excessive current away from components. The varistor is triggered by high voltages, and it clamps the voltage at a predetermined level and prevents damage to the connected load. The device is made up of zinc oxide which provides the variable resistive element.When a voltage spike or surge occurs, the V39ZA20P will reduce the voltage by providing a low-resistance path to ground, allowing the current to be diverted away from the circuit. Any excess energy is absorbed by the varistor and dissipated as heat. The device will then return to its rest state once the surge is over. This allows the system to be safeguarded against transient voltage spikes or surges and significantly extends the lifetime of the connected equipment.The V39ZA20P is typically used in combination with other components, such as fuses, to offer complete power-supply protection. It is important to note that the MOV\'s surge-protection capability is a function of both resistance and capacitance, so the proper choice of MOV is critical for an overall system design.In conclusion, the V39ZA20P is a non-polarized high-surge-capacity MOV intended for power-supply protection applications. It is designed to reduce the impedance of voltage spikes and surges, thereby preventing damage to components. The device is made up of zinc oxide, which provides the variable resistive element. Finally, it is important to note that the protection offered by a MOV is a combination of resistance and capacitance, and making the right choice of MOV is essential for effective protection.

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