Varistor Voltage (Typ):	510V
Package / Case:	Module
Mounting Type:	Chassis Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Capacitance @ Frequency:	2300pF @ 1kHz
Number of Circuits:	1
Energy:	640J
Current - Surge:	40kA
Varistor Voltage (Max):	561V
Series:	HighE
Varistor Voltage (Min):	459V
Maximum DC Volts:	420V
Maximum AC Volts:	320V
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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TVS - Varistors, MOVs

B72240B0321K001 Application Field and Working Principle

TVS-Varistors or Transient Voltage Suppressors as they are also known, are voltage-dependent semiconductor components that have the ability to limit or control transient overvoltages, commonly known as electrical spikes. This component is widely used in various power electronic applications such as power systems, power line protection, and power electronics applications, to protect against transient overvoltages. The B72240B0321K001 is a voltage-dependent semiconductor component which extends short circuit protection when used in applications as an over-voltage suppressor or suppressor for static electricity (ESD). It is specifically designed for automotive use.The working principle of the B72240B0321K001 basically works by reducing the voltage that is used to overvoltage the circuit, while providing the circuit with enough energy to meet its desired performance even in transient overvoltage conditions. The device consists of two electrodes which represent two substations of a circuit. The first electrode is connected to a capacitor which is responsible for blocking the undesired overvoltage. The second electrode is connected to a zener diode which is responsible for releasing the stored energy from the capacitor to the rest of the circuit.The voltage rating of the B72240B0321K001 is range-dependent, typically rated at 40V to 480V depending on the application. It has a peak pulse current of 1.3kA @8/20μs waveform and 44Ah Non-Repetitive Impulse withstand current. It features a long-term stability of ± 0.2% drift per 1000h and a typical surge current resistance of 150mA. Its operating temperature range is -55°C to 125°C and its maximum power dissipation is 5W.The B72240B0321K001 has multiple applications such as providing protection against short circuits and electrostatic discharge. In automotive applications, the TVS is used to protect vehicles from electric breakdown when subjected to lightning-induced voltage transients, which can affect the on-board control systems. In other power electronic applications, the TVS is used to protect electronic circuits from potentially damaging overvoltages. The TVS can also be used in home appliances and industrial equipment to provide ESD protection, thus ensuring a reliable and safe operation of the protected circuit.To conclude, the B72240B0321K001 is a voltage-dependent semiconductor component which provides a wide range of protection to a wide array of applications, including automotive, industrial, and home appliances. It is designed to protect the circuit from potentially damaging transient overvoltages, while also providing protection against short circuits and ESD. The device has a wide operating temperature range and can handle pulse currents up to 1.3kA and non-repetitive impulse withstand current of 44Ah.

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