V441HF34

Varistor Voltage (Typ):	690V
Package / Case:	Square 34mm, Tabs
Mounting Type:	Bolt Mount
Operating Temperature:	-55°C ~ 85°C (TA)
Capacitance @ Frequency:	2900pF @ 1MHz
Number of Circuits:	1
Energy:	620J
Current - Surge:	40kA
Varistor Voltage (Max):	758V
Series:	HF34
Varistor Voltage (Min):	622V
Maximum DC Volts:	587V
Maximum AC Volts:	440V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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TVS - Varistors, MOVs

Varistors, more commonly known as metal oxide varistors (MOVs), are voltage-dependent resistors typically used to clamp surges and protect circuits against overvoltage events. MOVs also act as transient voltage suppressors (TVS) to keep voltages in a protected region. When a transient voltage within a specific range is detected, the MOV will limit the voltage to a predetermined value. The V441HF34 is a type of MOV that can be used to provide overvoltage protection.The V441HF34 is a bidirectional single-pole, double-throw (SPDT) semiconductor switch that is capable of handling transients up to 10 kilovolts. It has a nominal on-state voltage of 5 volts and an off-state capacitance of 300 picofarad (pF). The MOV is constructed of a zinc oxide (ZnO) as the gate dielectric, silicon dioxide (SiO2) as the gate oxide, and aluminum as the gate metal. The MOV has a breakdown voltage of 33 volts and a maximum peak pulse power of 0.15 wattsThe V441HF34 has a wide range of applications due to its combination of low cost, small size, and high power handling capability. The device is designed to be durable and can be used in high humidity environments, such as damp basements and wet areas. Common applications include providing protection against surges in unstable power networks, bridging differential signals, and providing surge protection for automotive and AC power supplies. The V441HF34 is also commonly used in radio frequency applications due to its fast response and low capacitance. It can be used in systems such as base stations, digital TV antennas, and remote control devices. The device is sometimes used in conjunction with other components in order to provide greater protection and to increase the robustness of the system.To understand the working principle of the V441HF34, it is important to understand the physical properties of ZnO-based devices. When an electric field is applied across a material, electrons become mobile and create a voltage-dependent conductance. This conductance increases with increasing voltage as more electrons become mobile. Eventually, the electric field will be strong enough to break apart the atomic lattice of the material, resulting in a sharp increase in conductance called the “breakdown voltage.”The ZnO material of the V441HF34 has a wide range of conductance levels, from very low at low voltages to very high at high voltages. This means that when a surge is applied to the device, the MOV will be able to clamp the voltage to a predetermined lower value. This process helps to protect sensitive components from overvoltage events.The V441HF34 is an ideal device for applications requiring overvoltage protection. It is small, affordable, and able to withstand high frequencies and temperatures. Its range of applications is broad, and its robust design protects sensitive components. The ZnO-based technology of the device allows it to act as a voltage dependent resistor and clamp transient voltages to a predetermined value.

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